Development of IIS Distributed Hydrological Model (IISDHM) and its Application in Chao Phraya River Basin, Thailand

Abstract

A physically based distributed mathematical hydrological model has been developed. In this model, the hydrological processes of water movements are modeled either by finite difference representation of the partial differential equations of mass, momentum and energy conservation or by empirical equations derived from different research. Main processes of hydrological cycle, such as overland and river flow, unsaturated flow and ground water flow are modeled by St. Venant equation, Richard equation and Boussenq equation respectively. The model is applied in Ping catchment of Chao Phraya river basin, Thailand. The catchment area of the basin is 6, 300 sq. km. The results show the good agreement between simulated andobserved hydrological responses. The preprocessing and post processing of the data are done in GIS. An interactive software has been developedf or data input.