ANALYSIS OF RUNOFF CHARACTERISTICS GENERATED BY LAND SURFACE MODELS AND THEIR IMPACTS ON RIVER DISCHARGE

Abstract

 This research investigated runoff characteristics generated by two LSMs: MRI-SiB, which was embedded in a regional climate model NHRCM, and SiBUC. The generated runoff were given as input to a flow routing model 1K-FRM for simulating the river discharge to analyze their impacts. The simulation was applied in the upper part of Ping River basin in Thailand. First, the runoff characteristics from both models were analyzed. Then, river discharge simulation was conducted by utilizing the runoff from both LSMs. The simulated river discharge from both LSMs were analyzed in terms of volume of discharge and timing of peak discharge. Some possible causes of different runoff estimation by both LSMs were investigated by analyzing the effect of soil parameter settings, water budget, and model structures.