Next Article in Journal
Optimised Triangular Weir Design for Assessing the Full-Scale Performance of Green Infrastructure
Next Article in Special Issue
Impact Assessments of Rainfall–Runoff Characteristics Response Based on Land Use Change via Hydrological Simulation
Previous Article in Journal
Sensitivity Analysis of Extreme Daily Rainfall Depth in Summer Season on Surface Air Temperature and Dew-Point Temperature
Previous Article in Special Issue
Quantifying the Effects of Climate and Vegetation on Soil Moisture in an Arid Area, China
Open AccessArticle

Integrating XAJ Model with GIUH Based on Nash Model for Rainfall-Runoff Modelling

State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, No. 1 Xikang Road, Gulou District, Nanjing 210098, China
College of Hydrology and Water Resources, Hohai University, No.1 Xikang Road, Gulou District, Nanjing 210098, China
Jiangsu Province Hydrology and Water Resources Investigation Bureau, No. 5 Shanghai Road, Gulou District, Nanjing 220098, China
Bureau of Hydrology, Ministry of Water Resources of the People’s Republic of China, Beijing 10053, China
Author to whom correspondence should be addressed.
Water 2019, 11(4), 772;
Received: 25 January 2019 / Revised: 28 March 2019 / Accepted: 7 April 2019 / Published: 13 April 2019
(This article belongs to the Special Issue Water Related Disaster and Water Environment Management)
The geomorphologic instantaneous unit hydrograph (GIUH) is an applicable approach that simulates the runoff for the ungauged basins. The nash model is an efficient tool to derive the unit hydrograph (UH), which only requires two items, including the indices n and k. Theoretically, the GIUH method describes the process of a droplet flowing from which it falls on to the basin outlet, only covering the flow concentration process. The traditional technique for flood estimation using GIUH method always uses the effective rainfall, which is empirically obtained and scant of accuracy, and then calculates the convolution of the effective rainfall and GIUH. To improve the predictive capability of the GIUH model, the Xin’anjiang (XAJ) model, which is a conceptual model with clear physical meaning, is applied to simulate the runoff yielding and the slope flow concentration, integrating with the GIUH derived based on Nash model to compute the river network flow convergence, forming a modified GIUH model for flood simulation. The average flow velocity is the key to obtain the indices k, and two methods to calculate the flow velocity were compared in this study. 10 flood events in three catchments in Fujian, China are selected to calibrate the model, and six for validation. Four criteria, including the time-to-peak error, the relative peak flow error, the relative runoff depth error, and the Nash–Sutcliff efficiency coefficient are computed for the model performance evaluation. The observed runoff value and simulated series in validation stage is also presented in the scatter plots to analyze the fitting degree. The analysis results show the modified model with a convenient calculation and a high fitting and illustrates that the model is reliable for the flood estimation and has potential for practical flood forecasting. View Full-Text
Keywords: flood forecasting; GIUH; Nash model; Xin’anjiang model; flow velocity flood forecasting; GIUH; Nash model; Xin’anjiang model; flow velocity
Show Figures

Figure 1

MDPI and ACS Style

Chen, Y.; Shi, P.; Qu, S.; Ji, X.; Zhao, L.; Gou, J.; Mou, S. Integrating XAJ Model with GIUH Based on Nash Model for Rainfall-Runoff Modelling. Water 2019, 11, 772.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

Search more from Scilit
Back to TopTop