SWAT Literature Database for Peer-Reviewed Journal Articles

Title:Application of meteorological and hydrological drought indices to establish drought classification maps of the Ba River Basin in Vietnam 
Authors:Tri, D.Q., T.T. Dat and D.D. Truong 
Volume (Issue):6(2) 
Article ID:49 
URL (non-DOI journals): 
Broad Application Category:hydrologic only 
Primary Application Category:drought assessment 
Secondary Application Category:hydrologic and/or pollutant indices 
Watershed Description:14,132.04 km^2 Ba River, which drains portions of 20 districts within the Provinces of Kon Tum, Gia Lai and Daklak in the Central Highlands Region, and a coastal province in the south-central region of Phu Yen, in south central Vietnam. 
Calibration Summary: 
Validation Summary: 
General Comments: 
Abstract:The objective of this study was to establish drought classification maps to simulate and calculate the lack of discharge in the Ba River basin in Vietnam. The maps were established using three meteorological drought indices (the Standardized Precipitation Index (SPI), the Drought Index (J), and the Ped Index (Ped)), the Soil and Water Assessment Tool (SWAT) model, and the hydrological drought index (KDrought). The results from the calculation of the SPI, Aridity Index (AI), and Ped at three stations (An Khe, Ayunpa, and MDrak) showed that the J index was suitable for the study area. Based on the J index, an extreme drought was predicted to occur at the Ayunpa, An Khe, and MDrak stations. During the calibration process, the SWAT Calibration Uncertainties Program (SWAT-CUP) model, with automatic algorithms, was used to select the parameters to optimize the SWAT model. For the calibration and validation, the observed discharge at two hydrology stations, An Khe and Cung Son, from the periods 1981-1991 and 1992-2002, respectively, were used. The simulated discharge was found to be acceptable, with the Nash-Sutcliffe efficiency (NSE), Percent bias (PBIAS), and R2 reaching good levels in both calibration and validation. The results from the calculation of the drought index (KDrought), and the established drought classification maps in 2016, showed that the most affected areas were the communes of the Gia Lai and Dak Lak provinces. The results from the simulation and calculations were found to be consistent with the situation that occurred in practice. The application of meteorological and hydrological drought indices, as well as the hydrological model, to support impact assessments of drought classification in space and time, as well as the establishment of forecasting and warning maps, will help managers to effectively plan policy responses to drought. 
Keywords:Ba River basin; Drought classification maps; Hydrological drought; Meteorological drought; SWAT model