Sensors 2008, 8(7), 4441-4465; doi:10.3390/s8074441
Article

Integrating Remote Sensing Information Into A Distributed Hydrological Model for Improving Water Budget Predictions in Large-scale Basins through Data Assimilation

1,2,3,* email, 1email, 2email, 1, 1 and 1
Received: 28 May 2008; in revised form: 10 July 2008 / Accepted: 25 July 2008 / Published: 29 July 2008
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: This paper investigates whether remote sensing evapotranspiration estimates can be integrated by means of data assimilation into a distributed hydrological model for improving the predictions of spatial water distribution over a large river basin with an area of 317,800 km2. A series of available MODIS satellite images over the Haihe River basin in China are used for the year 2005. Evapotranspiration is retrieved from these 1×1 km resolution images using the SEBS (Surface Energy Balance System) algorithm. The physically-based distributed model WEP-L (Water and Energy transfer Process in Large river basins) is used to compute the water balance of the Haihe River basin in the same year. Comparison between model-derived and remote sensing retrieval basin-averaged evapotranspiration estimates shows a good piecewise linear relationship, but their spatial distribution within the Haihe basin is different. The remote sensing derived evapotranspiration shows variability at finer scales. An extended Kalman filter (EKF) data assimilation algorithm, suitable for non-linear problems, is used. Assimilation results indicate that remote sensing observations have a potentially important role in providing spatial information to the assimilation system for the spatially optical hydrological parameterization of the model. This is especially important for large basins, such as the Haihe River basin in this study. Combining and integrating the capabilities of and information from model simulation and remote sensing techniques may provide the best spatial and temporal characteristics for hydrological states/fluxes, and would be both appealing and necessary for improving our knowledge of fundamental hydrological processes and for addressing important water resource management problems.
Keywords: Evapotranspiration; Distributed hydrological model; Data assimilation; WEP; SEBS; Extended Kalman Filter.
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MDPI and ACS Style

Qin, C.; Jia, Y.; Su, Z.; Zhou, Z.; Qiu, Y.; Suhui, S. Integrating Remote Sensing Information Into A Distributed Hydrological Model for Improving Water Budget Predictions in Large-scale Basins through Data Assimilation. Sensors 2008, 8, 4441-4465.

AMA Style

Qin C, Jia Y, Su Z, Zhou Z, Qiu Y, Suhui S. Integrating Remote Sensing Information Into A Distributed Hydrological Model for Improving Water Budget Predictions in Large-scale Basins through Data Assimilation. Sensors. 2008; 8(7):4441-4465.

Chicago/Turabian Style

Qin, Changbo; Jia, Yangwen; Su, Z.; Zhou, Zuhao; Qiu, Yaqin; Suhui, Shen. 2008. "Integrating Remote Sensing Information Into A Distributed Hydrological Model for Improving Water Budget Predictions in Large-scale Basins through Data Assimilation." Sensors 8, no. 7: 4441-4465.


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