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Determination of Areas Susceptible to Landsliding Using Spatial Patterns of Rainfall from Tropical Rainfall Measuring Mission Data, Rio de Janeiro, Brazil

Department of Geography, University of Brasília, Federal District, Brasília 70910-900, Brazil
Department of Earth and Space Sciences, University of Washington, Seattle, WA 98195, USA
Department of Agricultural and Environmental Engineering, Fluminense Federal University, Niterói 24210-510, Brazil
Author to whom correspondence should be addressed.
ISPRS Int. J. Geo-Inf. 2017, 6(10), 289;
Received: 31 July 2017 / Revised: 5 September 2017 / Accepted: 11 September 2017 / Published: 6 October 2017


Spatial patterns of shallow landslide initiation reflect both spatial patterns of heavy rainfall and areas susceptible to mass movements. We determine the areas most susceptible to shallow landslide occurrence through the calculation of critical soil cohesion and spatial patterns of rainfall derived from TRMM (Tropical Rainfall Measuring Mission) data for Paraty County, State of Rio de Janeiro, Brazil. Our methodology involved: (a) creating the digital elevation model (DEM) and deriving attributes such as slope and contributing area; (b) incorporating spatial patterns of rainfall derived from TRMM into the shallow slope stability model SHALSTAB; and (c) quantitative assessment of the correspondence of mapped landslide scars to areas predicted to be most prone to shallow landsliding. We found that around 70% of the landslide scars occurred in less than 10% of the study area identified as potentially unstable. The greatest concentration of landslides occurred in areas where the root strength of vegetation is an important contribution to slope stability in regions of orographically-enhanced rainfall on the coastal topographic flank. This approach helps quantify landslide hazards in areas with similar geomorphological characteristics, but different spatial patterns of rainfall.

1. Introduction

Mass movements occur at a variety of spatial and temporal scales, influencing hillslope evolution in high-relief areas [1], and posing a significant hazard in upland regions. Relatively little work on landslide prediction has been done to date in the humid tropics [2,3,4]. Particularly dangerous are rapid slope failures occurring along well-defined shear zones due to infiltration of high-intensity rainfall that fills the voids between soil particles, raising the pore-water pressure that acts in opposition to the normal stress, thereby reducing the material strength and triggering instability [5,6,7]. Precipitation and slope steepness influence shallow slope failures within the weathering mantle that generally fails to a depth conditioned by the soil and saprolite/rock strength and root reinforcement. Such translational landslides in the highlands of the state of Rio de Janeiro are common and have caused numerous fatalities in recent years. The combination of heavy summer rains and the lack of urban planning creates high landslide disaster potential in the region where growing cities face possible loss of life and material damage.
Normally, the landscape-scale prediction of landslide hazards considers the geostatistical relationships of previous events. Studies around the world focus on mapping landslide susceptibility based on combining landslide inventories with probabilistic, deterministic, and statistical approaches [8,9,10,11,12,13]. Physically-based (deterministic) models are widely used and have shown good results for shallow slope stability around the world. This type of model does not require a long-term landslide inventory, which is a significant advantage [14]. Examples of this approach include the following methods: Transient Rainfall Infiltration and Grid-Based Regional Slope-Stability Model (TRIGRS) [15]; Shallow Slope Stability Model (SHALSTAB) [16]; Stability Index Mapping (SINMAP) [17]; and Shallow Landslides Instability Prediction (SLIP) [18]. These models exhibit different degrees of complexity and hydrological models, yet present similar results when compared to spatial patterns of landslides scars [19]. SHALSTAB is one approach to landslide hazard assessment that uses topographic characteristics to model the spatial distribution of landslide hazards based on combining a simple hydrological model with a slope stability model and digital elevation models [16]. Several studies have tested and applied SHALSTAB in Brazil. Fernandes et al. [20] evaluated the spatial relationships between landslides and morphological factors. Guimarães et al. [21] analyzed the parameterization of soil properties in two basins in Rio de Janeiro after a strong rainstorm. Gomes et al. [22] verified the model’s behavior at different cartographic scales.
Recent research has investigated relationships between landslides and rainfall events [23,24,25]. A variety of landslide models use rainfall data, such as simple 1D numerical approach [26], object-oriented methods [27], logistic regression [28], and distributed hydrological-geotechnical models [29]. Remotely-sensed rainfall data [30] generate spatial patterns at a scale of kilometers to tens of kilometers that can be used to explore the effects of storm events and orographic effects on hazard generation and thereby estimate shallow landslide susceptibility over large areas [31]. For example, Minder et al. [32] used spatial patterns of rainfall using radar (MM5) estimates of the rainfall rate with the SHALSTAB model to predict shallow landslide susceptibility in the Northwestern United States. In this study, we incorporate rainfall from Tropical Rainfall Measuring Mission (TRMM) into landform analysis (SHALSTAB) to test a regional-scale method for assessing landslide hazards and establish critical cohesion indexes for triggering landslides in Rio de Janeiro, Brazil.

2. Study Area

Paraty is a municipality in the southern portion of the state of Rio de Janeiro, with historical, political, economic, and social importance (Figure 1). The region presents a climatic zoning strongly influenced by large topographical variation and strongly orographic rainfall [33,34]. Average monthly temperatures in the region range from 18 °C in the coldest months to 25 °C in the hottest months. The rainfall stations at São Roque (coast) and Campos de Cunha (behind the mountain) (Figure 1) display distinct behavior over the past 10 years (Table 1). Annual average rainfall at the coastal gauge (São Roque) is 2384 mm, not quite twice that of the Campos de Cunha station, which averages 1345 mm of rainfall annually. According to Soares et al. [35], this region is strongly influenced by the topography of the Serra do Mar, with the most intense rainfall occurring on the steep slopes of the escarpment.
The Bocaina Plateau is the highest area (>2000 m of altitude) of the Serra do Mar (1000 km of extension) situated on the eastern flank of the continental rift border of Southeastern Brazil [36]. The main lithologies of Serra da Bocaina are medium to high-grade orthogneisses and paragneisses, dominated by regional NE-SW trending ductile shear zones that dip steeply (~60°) to the northwest or southeast [37] (Figure 2).
Precambrian deformation was dominated by Neoproterozoic Brasiliano/Pan African Cycle structures during consolidation of the South American Platform [38,39,40]. Over geologic time, the Neoproterozoic shear zones have been consistent zones of weakness during reactivation events [41]. In the Mesozoic, the Late Jurassic separation of the Gondwana supercontinent culminated in the Early Cretaceous opening of the South Atlantic Ocean, which reactivated older discontinuities in pulses from the Cretaceous to Tertiary [41]. Tholeiitic basalt flows and dike swarms preceded this continental breakup [36,42]. The crustal discontinuities also controlled Mesozoic and Cenozoic alkaline magmatism [43]. During the Paleogene, normal faults reactivated Neoproterozoic shear zones, generating a continental rift in Southeastern Brazil parallel to the current coastline [44]. Lastly, late Pleistocene to Holocene neotectonic reactivation caused significant altitude differences between the Bocaina Plateau and adjacent rift valley, determining the local geomorphologic features with abrupt escarpments, a drainage network pattern controlled by the fault zones, and alluvial fan deposits at the base of mountains [44,45].
The soils are thin in the steepest areas over granite, thicker over gneiss in the plateau, and thickest in the coastal plain over sediments. Cambisols are the predominant soil type in the plateau and upland areas where Latosols and Arcisols also occur. Spodosols and Neosols occur in the floodplains (Figure 3).

3. Materials and Methods

3.1. Shallow Landslide Model

SHALSTAB is a physically-based model for the topographic controls of a shallow landslide that couples a slope-stability model based on Mohr-Coulomb criterion with a hydrological model to quantify susceptibility to translational shallow landslide along a well-defined shear plane [46]. We can express the stability of a slope through the ratio of the shear stresses driving slope failure (τ) to those forces tending to resist these driving stresses [11,47]. We adopt the approach known as the infinite-slope stability model, which ignores the effects caused by friction on the sides and ends of a block of soil. It is most applicable for translational slip where the length of the scar greatly exceeds the thickness of the soil. This analysis is based on the condition at slope failure where the shear stress (τ = ρsgzsinθ, where ρs is the soil bulk density, g is the gravitational acceleration, z is the soil thickness, and θ is the ground slope) equals the shear strength (SS) of a slope-forming material, which is given by:
SS = C’ + (σ − μ)tanφ
where C’ is the effective cohesion of the slope-forming material, σ is the normal stress (ρsgzcosθ), μ is the pore-water pressure, and φ is the angle of internal friction.
Assuming hydrostatic conditions and expressing the pore pressure as the relative saturation of the soil, the critical saturation level for slope failure (when τ = SS) may be expressed as:
h z = C ρ w g z cos 2 θ tan φ + ρ s ρ w ( 1 tan θ tan φ )
where ρw is the density of water and h is the thickness of saturated zone within the soil with a total thickness z.
With respect to the hydrological model, SHALSTAB adopts O’Loughlin’s [48] formulation that assumes infiltrating water penetrates to a lower conductivity layer at the base of the soil, and then follows topographically-determined flow paths. For a steady-state rainfall, the degree of relative saturation is then defined by the relative moisture content (h/z), and may be expressed as:
h z = Q T a b s i n θ
where Q is steady-state precipitation rate, a represents upslope contributing area (m2), b is the length of pixel side (m), θ is the slope (in degrees), and T is the soil transmissivity (m2/day). Since tree roots may be important for soil reinforcement on the steep slopes of the escarpment, we substituted Equation (3) into Equation (2) and solved for the critical cohesion value necessary to resist slope failure as a function of soil properties, topography, and rainfall [49]:
C c r i t i c a l = ρ w g z cos 2 θ tan φ [ a Q b T sin θ ρ s ρ w ( 1 tan θ tan φ ) ]
We categorize critical cohesion values into five classes, expressed in kPa, with varying degrees of potential instability, from those where high cohesion is required to maintain slope stability to those where the slope is stable even when the soil is completely saturated (i.e., h = z).
Our procedure for applying SHALSTAB considered the spatial patterns of rainfall to determine the critical cohesion levels through: (a) obtaining a digital elevation model (DEM) and terrain attributes, (b) acquiring rainfall data, (c) parameterizing soil properties, and (d) evaluating model performance through mapping landslides.

3.2. Digital Elevation Model and Terrain Attributes

The topographical attributes of slope and drainage area are commonly incorporated into models for prediction and definition of potentially unstable areas [50,51,52,53]. We built a 20 meter-grid DEM from digital contours from a 1:25,000 scale topographic map and interpolated with “topo to raster” module of ArcGIS software v. 10.4.1 (Environmental Systems Research Institute - ESRI, Redlands, CA, USA, 2016). Slope (θ) and specific catchment area (a/b) were estimated directly from the DEM.

3.3. Acquisition of Rainfall Data

In rainfall data acquisition, the low density of meteorological observations in some regions compromises the applicability of studies related to orographic weather systems that directly influence the precipitation regime [54]. Many studies have used estimation techniques based on precipitation obtained from satellites to estimate the rainfall distribution and relate it to landslide locations [32,55,56]. In addition, some researchers consider rainfall intensity and wind effects in their landslides prediction models. Liu and Shih [57] took into account the effects of wind-driven rainfall as a significant factor in landslides that occurred in Taiwan during Typhoon Mindulle. Similarly, Rogers et al. [58] developed another approach to consider oblique rainfall-aspect in Himalayan Mountains of Northern Pakistan based on directional monsoon effects. While these GIS models consider wind as a landslide-triggering parameter [59], very strong winds are not the case in Southwestern Brazil, and our approach disregards wind intensity.
The Tropical Rainfall Measuring Mission (TRMM), launched in November 1997, provided the first space-based precipitation radar data used for climate studies. TRMM was conceived as an experimental satellite derived from a partnership between NASA and the Aerospace Exploration Agency of Japan (JAXA). The TRMM rainfall product (3B42) provides the most accurate estimates of globally integrated data from CAMS (Climate Assessment and Monitoring System) and GPCC (Global Precipitation Climatology Center) based on TMI (microwave imager) and VIRS (visible and infrared scanner) data. This product provides a global coverage of precipitation in the latitude band 50° N–S at 0.25° × 0.25° (lat/long) resolution and rainfall rates at three-hourly intervals [60]. The quality of rainfall estimates from TRMM 3B43 data have been evaluated using rain gauges in Africa [61,62], Asia [63,64,65], New Mexico [66], and Southern Brazil [67]. These studies conclude that TRMM data show great potential as input data for hydrological models. For this study, we assessed spatial variation in rainfall intensity using the mean values of time series datasets of annual rainfall for 2000–2007, converted to millimeters per day.

3.4. Parameterization of Soil Properties

In studies of natural hillslopes, soil property parameters are essential for quantitative stability analysis [47]. However, the use of models that consider soil spatial variability remains challenging, given the importance of the basal stratigraphic boundary uncertainty (i.e., soil thickness) that affects slope stability [68]. Recent methods of spatial variability of soil properties have been developed to be used in slope reliability analysis. These works are developed using mainly random field theory in small areas, such as a single slope [69,70], a single landslide [71], or even in an artificial hillslope [72]. The complexity of addressing spatial variability in soil properties increases with the area under consideration. In drainage basin studies, soil property values are obtained from laboratory analyses of samples collected in situ [73,74], or based on standard parameters reported in adjacent basins with similar geological and geomorphological characteristics [21,75].
Limited data are available on measured soil properties along the Serra do Mar. De Campos et al. [76] obtained laboratory values of soil friction angle (φ) ranging between 28 and 32 degrees in wet soils and between 35 and 44 degrees in dry soil. In Nova Friburgo (RJ), De Campos et al. [77] took values of 32.4° for the friction angle and 1.5 kPa for cohesion as representative conditions for saturated soil. Costa Nunes [78] found values of 25–40° for the friction angle in the Tijuca Massif. De Ploey and Cruz [79] in Caraguatatuba (SP) conducted field measurements for regolith developed on gneiss and found friction angles varied between 21 and 35 degrees and bulk densities ranged from 1.5 to 2 g/cm3. In this simulation, we choose values within the range of field-measured parameters reported by De Ploey and Cruz [79] from nearby areas and values used by Minder et al. [32] and Montgomery et al. [80] (Table 2).

3.5. Landslide Mapping

We assessed the accuracy of the predicted distributions of landslide-prone slopes using SHALSTAB by comparing them to mapped landslide scars. Landslide scars were mapped delineating a defined head (source areas), body (runout tracks), and base (deposits). In this study, we identified landslide scars on georeferenced and orthorectified digital photography acquired in 2006, with a 1-meter spatial resolution. Model performance was evaluated by the percentage of the scars that fell in potentially unstable areas identified by the model.

4. Results

The DEM of the study area shows steep and rugged relief in the headwaters (Figure 4), with elevations ranging from sea level to over 1805 m. TRMM data express the daily average rainfall for a series of eight years (2000–2007). The results reinforce the relationship between elevation and average rainfall rate, in which both rise from east to west and south to north (Figure 4). We divided the daily average rainfall rate into five classes, ranging from 3 mm/day to >4 mm/day. We identified from orthophotos 46 landslide scars, most of which occur on the escarpment, and which all together occupy 18 ha, corresponding to 0.02% of the total area. The locations of 80% of the mapped features have daily average rainfall rates over 3.5 mm/day (Figure 5). Slope steepness in the region ranges up to 73 degrees (Figure 6), with the highest values on the escarpment and the lowest values near the coast; the largest contributing areas drain to the coast and define the principal rivers in the county.
Landslide susceptibility maps delineate areas of potential failure based on the five classes of critical cohesion (Table 3). The lowest critical cohesion class (0–1 kPa) occupies 4% of the total area of the county and its spatial distribution is directly related to the escarpment of the Serra of Bocaina and steepest slopes (Figure 7). As the escarpment and steepest slopes are distributed throughout the county, more than half of the locations in this critical cohesion class are in high rain rate areas, and about 24% in the 3–3.25 mm/day class (Figure 8). A relatively small proportion of the landscape accounts for the zone of greatest potential for slope instability, as indicated by the highest critical cohesion categories (i.e., >2 kPa). In the higher rainfall zones, the higher critical cohesion classes occupy more area than lower classes. This is the opposite to the case in the lower rainfall rate areas, where low critical cohesion classes occupy less of the land areas. Thus, the root strength of vegetation plays a greater role in reinforcing slope strength in a wetter zone along the escarpment than in drier coastal zone. Most of the region (91%) is predicted to have little risk of slope failure and be unconditionally stable.
More than 70% of total area of landslide scars occurred in areas predicted to be potentially unstable, which together occupied just 9% of the total area (Figure 9). Almost half (46%) of the landslides occurred in the 2–5 kPa and 5–10 kPa critical cohesion classes, which together cover about 3% of the study area. This suggests an important role for vegetation as an influence on slope stability portions of the region. About a quarter of the landslides occurred in the low critical cohesion classes, and the remaining quarter occurred in areas predicted to be unconditionally stable. The highest landslide frequency occurs in areas with a combination of critical cohesion of 2–5 kPa and high rainfall quantity located in the middle and upper quadrant, which together create conditions favorable to triggering landslides (Table 4). The results indicate that the model predicts areas at higher risk of slope failure and that the combination of greater annual rainfall and slope morphology offers a better assessment of the spatial pattern of landslide risk than does either parameter alone.

5. Discussion

Many challenges are inherent in landslide susceptibility mapping in tropical areas, where there is a continuous increase in the exposure of people to their effects. In this study, we ran the SHALSTAB model in an area representative of steep escarpments with orographic rainfall. We solved the model equation for critical soil cohesion as a measure of slope instability [32]. This allows including precipitation grid values in addition to physical and topographic parameters. The study area has only two precipitation gauges, making the use of TRMM data fundamental for information consistency and mapping improvement in comparison with the landslides’ scar maps. The results show that embedding TRMM data in the SHALSTAB model is relevant to landslide prediction in localities lacking precipitation gauges.
Many researchers use meteorological satellite data to determine landslide-susceptible areas, both in regional areas [81] and global areas [30]. Maggioni et al. [82] performed an extensive review on the comparison of TRMM and gauges around the world. They verified that relief, climate, and seasonality contribute to satellite precipitation products performance. They also attested that TRMM3B42, used in this work, presented the best correlation with gauge observations in tropical regions. Due to its simplicity and flexibility, SHALSTAB has been applied in different ways, through solving for different variables (e.g., Q or Q/T). Solving for the critical soil cohesion as a measure of slope instability using TRMM data offers a way to integrate spatial patterns in rainfall into landslide hazard assessment.
Our analysis shows that particularly landslide-prone areas occur along the escarpment where average daily rainfall is above 3.75 mm/day in locations with a critical cohesion between 2–5 kPa. Given these values, and as Atlantic forest covers almost the entirety of the Serra da Bocaina, forestry practices that decrease root strength would appear to promote instability [32].

6. Conclusions

Strongly orographic rainfall is a major influence on landslide initiation along the passive margin escarpment of Southeastern Brazil. In the summer, cold fronts arriving from the south polar regions of the South Atlantic Ocean deliver heavy, landslide-triggering rainfall along the landslide-prone Serra da Bocaina escarpment, where orographic precipitation increases the landslide hazard. Due to the lack of rain gauges in the area, TRMM-derived estimates are useful for mapping precipitation patterns. Landslide mapping showed that around 70% of all scars occurred in the areas predicted to be potentially unstable, which corresponds to less than 10% of the total area. We find that the highest risk of landslide occurrence is for 2–5 kPa critical cohesion and an average daily rainfall of 3.75–4 mm. Spatial correlation of steeper slopes along the escarpment with greater rainfall delivery means that the cohesion provided by vegetation is particularly important for slope stability along the escarpment. However, the occurrence of about a quarter of the mapped landslides in areas predicted to be unconditionally stable indicates that a significant number of landslides happen in gentle relief. Taken together, our results demonstrate that this method has potential applications in both local and regional planning and disaster prevention. Improvements in resolution and quality datasets for mountain rainfall rates, and in combining gauge networks and high-resolution atmospheric model output would further contribute to better performance for slope stability mapping. In addition, complementary studies should be conducted, correlating the different types of mass movement with the rain intensities.


This study was funded through a project grant from the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq). The authors are grateful for financial support from CNPq fellowship (Osmar Abílio de Carvalho Júnior, Renato Fontes Guimarães, Roberto Arnaldo Trancoso Gomes) and Financiadora de Estudos e Projetos (FINEP). The authors acknowledge the contribution from anonymous reviewers.

Author Contributions

Renato Fontes Guimarães, David R. Montgomery, and Osmar Abílio de Carvalho Júnior wrote the manuscript and was responsible for the research design, mathematical model, data preparation and analysis. Wátila Portela Machado, Roberto Arnaldo Trancoso Gomes, and Pedro Coutinho Mendonça provided the data, conducted the field-works and gave relevant technical support. Harvey M. Greenberg provided significant input to the numerical analysis and computational optimization. Márcio Cataldi contributed to the climate data processing. All authors contributed in editing and reviewing the manuscript.

Conflicts of Interest

The authors declare no conflict of interest.


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Figure 1. Study area showing location of rain gauges at Campos de Cunha and São Roque.
Figure 1. Study area showing location of rain gauges at Campos de Cunha and São Roque.
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Figure 2. Geological map of the Paraty municipality.
Figure 2. Geological map of the Paraty municipality.
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Figure 3. Soil map of the Paraty municipality.
Figure 3. Soil map of the Paraty municipality.
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Figure 4. Maps of elevation with TRMM rainfall contour line-derived average daily rainfall for 2000–2007.
Figure 4. Maps of elevation with TRMM rainfall contour line-derived average daily rainfall for 2000–2007.
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Figure 5. Scar distribution according to the average rainfall rate.
Figure 5. Scar distribution according to the average rainfall rate.
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Figure 6. Slope map of the Paraty municipality.
Figure 6. Slope map of the Paraty municipality.
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Figure 7. Critical cohesion based on the SHALSTAB model, using T = 65 m2/day, soil depth = 1 m, bulk density = 2.0 g/cm3, and phi = 33 degrees.
Figure 7. Critical cohesion based on the SHALSTAB model, using T = 65 m2/day, soil depth = 1 m, bulk density = 2.0 g/cm3, and phi = 33 degrees.
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Figure 8. Percentage area of rain rate average. The color lines represent critical cohesion predicted by SHALSTAB using TRMM rainfall along the rainfall classes.
Figure 8. Percentage area of rain rate average. The color lines represent critical cohesion predicted by SHALSTAB using TRMM rainfall along the rainfall classes.
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Figure 9. Percentage of the total area of the 46 mapped landslide scars by cohesion class.
Figure 9. Percentage of the total area of the 46 mapped landslide scars by cohesion class.
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Table 1. Annual rainfall (mm) for São Roque and Campos de Cunha rainfall stations.
Table 1. Annual rainfall (mm) for São Roque and Campos de Cunha rainfall stations.
YearCampos de Cunha StationSão Roque Station
Table 2. Soil parameter values used in this study.
Table 2. Soil parameter values used in this study.
Transmissivity (T)65 m2/day
Soil depth (z)1 m
Angle of internal friction (φ)33°
Bulk density (ρs)2 (g/cm3)
Table 3. Critical levels of cohesion class areas.
Table 3. Critical levels of cohesion class areas.
Critical Levels of Cohesion ClassArea (ha)Percentage (%)
5–10 kPa74<1
2–5 kPa21532
1–2 kPa21932
0–1 kPa37584
Unconditionally Stable83,18491
Table 4. Correlation matrix for landslide frequency in terms of critical cohesion and average rainfall.
Table 4. Correlation matrix for landslide frequency in terms of critical cohesion and average rainfall.
Critical Cohesion (kPa)3.00–3.25 (mm/day)3.26–3.50 (mm/day)3.51–3.75 (mm/day)3.76–4.00 (mm/day)4.01–4.17 (mm/day)

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Guimarães, R.F.; Machado, W.P.; De Carvalho, O.A., Júnior; Montgomery, D.R.; Gomes, R.A.T.; Greenberg, H.M.; Cataldi, M.; Mendonça, P.C. Determination of Areas Susceptible to Landsliding Using Spatial Patterns of Rainfall from Tropical Rainfall Measuring Mission Data, Rio de Janeiro, Brazil. ISPRS Int. J. Geo-Inf. 2017, 6, 289.

AMA Style

Guimarães RF, Machado WP, De Carvalho OA Júnior, Montgomery DR, Gomes RAT, Greenberg HM, Cataldi M, Mendonça PC. Determination of Areas Susceptible to Landsliding Using Spatial Patterns of Rainfall from Tropical Rainfall Measuring Mission Data, Rio de Janeiro, Brazil. ISPRS International Journal of Geo-Information. 2017; 6(10):289.

Chicago/Turabian Style

Guimarães, Renato Fontes, Wátila Portela Machado, Osmar Abílio De Carvalho Júnior, David R. Montgomery, Roberto Arnaldo Trancoso Gomes, Harvey M. Greenberg, Márcio Cataldi, and Pedro Coutinho Mendonça. 2017. "Determination of Areas Susceptible to Landsliding Using Spatial Patterns of Rainfall from Tropical Rainfall Measuring Mission Data, Rio de Janeiro, Brazil" ISPRS International Journal of Geo-Information 6, no. 10: 289.

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