SWAT Sub-daily Runoff simulation for Jawoon-ri Watershed = SWAT Sub-daily Runoff simulation for Jawoon-ri Watershed

다국어 초록 (Multilingual Abstract)

Physiological process within the watershed due to various climate, hydrology and current agricultural practices has been simulated in the form of different software. Soil and Water Assessment tool (SWAT) assumes real representation for the physiological process that occurs in watershed. SWAT has been used for numerous hydrologic and water quality studies on daily time-steps including monthly and yearly with promising results. However SWAT simulation on real time basis (with sub daily time step, sub-hourly time steps) is not widely used despite availability in SWAT on this time steps. SWAT sub-daily runoff simulation with sub-daily rainfall data set is assumed to be real response of the watershed in generating the runoff and sediment at the instant time than SWAT simulation with daily, monthly and yearly time setup. The study is performed for SWAT sub-daily runoff simulation in a very small area of 0.008 km² of the Jaun-ri with latitude 27.28 and longitude -92.7 in South Korea. Some modifications have been made in files to support the rainfall data set in the format of sub-daily time step. Moreover the study utilize the option for runoff estimated with Green and Ampt and hourly stream routing which has successfully figure out the surface runoff with hourly variation. The study is limited to the simulation of rainfall event than for whole year. Study reveals simulated values follow the trend of measured value with some overestimation (R²=0.755). Rainfall for each event is directly proportional to the simulated runoff value. It has been concluded that the SWAT with sub-daily runoff simulation should be tested for the result of whole simulated year than rainfall event basis with the reasonable accuracy.