| Development of a Cell-based Model to Derive Direct Runoff Hydrographs for Ungauged Mountainous Basins |
| |
| 作者姓名： | P. B. Hunukumbura S.B. Weerakoon Srikantha Herath |
| |
| 作者单位： | Disaster Prevention Research Institute Kyoto University Kyoto Japan，Dept. of Civil Engineering University of Peradeniya Sri Lanka，Environment and Sustainable Development Programme United Nations University Tokyo Japan |
| |
| 基金项目： | Thanks go to the Department of Irrigation, Sri Lanka for providing hourly stream flow data. |
| |
| 摘 要： | A model to derive direct runoff hydrograph for an ungauged basin using the physical properties of the basin is presented. The basin is divided into grid cells and canal elements. Overland flow is generated from each grid cell of the basin by application of continuous effective rainfall of 1 mm/hr to the basin. The flow generated is routed through downstream grid cells and the canal elements using the kinematic wave approach. The travel time for direct runoff from each grid cell to the basin outlet is calculated and the S-curve is derived for the basin. The S-curve is used to derive the unit hydrograph of a given duration for the basin. The model, referred as Cell-basin model was applied to the Upper Kotmale Basin in Sri Lanka and the model predictions of direct runoff hydrographs for rainfall events agreed with the observations to a reasonable accuracy. Comparison of the unit hydrographs obtained from the model and from the conventional Snyder’s synthetic unit hydrograph using regionalized parameters assuming the basin as an ungauged basin, with the unit hydrograph derived from the observations showed that the model predicted unit hydrograph was more suitable than that obtained by Snyder’s method for Sri Lankan up country basins. Thus, the present model is a useful tool to obtain direct runoff hydrograph for ungauged basins.
|
| 关 键 词： | GIS技术 盆地 水位图 径流 |
| 收稿时间： | 5 November 2005 |
| 修稿时间： | 2007-06-13 |
Development of a Cell-based model to derive direct runoff hydrographs for ungauged mountainous basins |
| |
| P. B. Hunukumbura S.B. Weerakoon Srikantha Herath.Development of a Cell-based Model to Derive Direct Runoff Hydrographs for Ungauged Mountainous Basins[J].Journal of Mountain Science,2007,4(4):309-320. |
| |
| Authors: | P B Hunukumbura S B Weerakoon Srikantha Herath |
| |
| Institution: | (1) Agricultural and Bioresource Engineering, McGill University, Macdonald Campus, MS1-019, MS building, 21111, Lakeshore Road, Ste-Anne-De-Bellevue, H9X3V9 Montreal, Quebec, Canada;(2) Brace Centre for Water Resources Management, McGill University, Montreal, Canada;(3) Department of Bioresource Engineering, McGill University, Montreal, Canada |
| |
| Abstract: | A model to derive direct runoff hydrograph for an ungauged basin using the physical properties of the basin is presented. The basin is divided into grid cells and canal elements. Overland flow is generated from each grid cell of the basin by application of continuous effective rainfall of 1 mm/hr to the basin. The flow generated is routed through downstream grid cells and the canal elements using the kinematic wave approach. The travel time for direct runoff from each grid cell to the basin outlet is calculated and the S-curve is derived for the basin.The S-curve is used to derive the unit hydrograph of a given duration for the basin.
The model, referred as Cell-basin model was applied to the Upper Kotmale Basin in Sri Lanka and the model predictions of direct runoff hydrographs for rainfall events agreed with the observations to a reasonable accuracy. Comparison of the unit hydrographs obtained from the model and from the conventional Snyder's synthetic unit hydrograph using regionalized parameters assuming the basin as an ungauged basin, with the unit hydrograph derived from the observations showed that the model predicted unit hydrograph was more suitable than that obtained by Snyder's method for Sri Lankan up country basins. Thus, the present model is a useful tool to obtain direct runoff hydrograph for ungauged basins. |
| |
| Keywords: | Ungauged basin GIS unit hydrograph mountainous basin direct runoff hydrograph model cell-based model cell-basin model |
| 本文献已被 CNKI 维普 万方数据 SpringerLink 等数据库收录！ |
