Development and Integration of Sub-hourly Rainfall-Runoff Modeling Capability Within a Watershed Model

被引:138
作者
Jeong, Jaehak [1 ]
Kannan, Narayanan [1 ]
Arnold, Jeff [2 ]
Glick, Roger [3 ]
Gosselink, Leila [3 ]
Srinivasan, Raghavan [4 ]
机构
[1] Texas AgriLife Res, Temple, TX 76502 USA
[2] USDA ARS, Grassland Soil & Water Res Lab, Temple, TX 76502 USA
[3] Watershed Protect & Dev Review Dept City Austin, Austin, TX 78767 USA
[4] Texas A&M Univ, Spatial Sci Lab, College Stn, TX 77845 USA
关键词
SWAT; Rainfall-runoff modeling; Watershed modeling; Subdaily simulation; Sub-hourly simulation; EFFECTS ASSESSMENT PROJECT; GREEN-AMPT; AUTOMATIC CALIBRATION; SENSITIVITY-ANALYSIS; KINEMATIC-WAVE; RIVER; SIMULATION; BENEFITS; AREA; SWAT;
D O I
10.1007/s11269-010-9670-4
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Increasing urbanization changes runoff patterns to be flashy and instantaneous with decreased base flow A model with the ability to simulate sub-daily rainfall runoff processes and continuous simulation capability is required to realistically capture the long-term flow and water quality trends in watersheds that are experiencing urbanization Soil and Water Assessment Tool (SWAT) has been widely used in hydrologic and nonpoint sources modeling However, its subdaily modeling capability is limited to hourly flow simulation This paper presents the development and testing of a sub-hourly rainfall runoff model in SWAT SWAT algorithms for infiltration, surface runoff, flow routing, impoundments, and lagging of surface runoff have been modified to allow flow simulations with a sub-hourly time interval as small as one minute Evapotranspiration, soil water contents, base flow, and lateral flow are estimated on a daily basis and distributed equally for each time step The sub-hourly routines were tested on a 1 9 km(2) watershed (70% undeveloped) near Lost Creek m Austin Texas USA Sensitivity analysis shows that channel flow parameters are more sensitive in sub-hourly simulations (Delta t = 15 min) while base flow parameters are more important in daily simulations (Delta t = 1 day) A case study shows that the sub-hourly SWAT model reasonably reproduces stream flow hydrograph under multiple storm events Calibrated stream flow for 1 year period with 15 min simulation (R-2 = 0 93) shows better performance compared to daily simulation for the same period (R-2 = 0 72) A statistical analysis shows that the improvement in the model performance with sub-hourly time interval is mostly due to the improvement in predicting high flows The sub-hourly version of SWAT is a promising tool for hydrology and non-point source pollution assessment studies, although more development on water quality modeling is still needed
引用
收藏
页码:4505 / 4527
页数:23
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