基于SWAT模型的三水河流域径流模拟

Runoff Simulation of Sanshuihe Basin Based on SWAT Model

以三水河流域作为研究区,基于GIS构建流域的SWAT分布式水文模型,建立流域模型的空间数据库和属性数据库,对影响模拟径流结果的几个重要参数进行敏感性分析,并应用1980-1986年的水文气象数据进行参数率定,应用1987-1990年的实测数据进行模型验证。通过对月径流模拟值和实测值的比较,校准期和验证期的相对误差、判定系数和ENS系数分别为-18%、0.73、0.71和12%、0.76、0.72。基于这些评价指标可知SWAT模型在三水河流域径流模拟中有良好的可靠性和适用性,可以作为该流域水资源综合管理的支撑模型之一。

Taking Sanshuihe basin as a case study region, the SWAT distributed hydrological model was built based on GIS technolo gy. Through establishing the spatial and attribute databases, the sensitivity analysis was performed for several important parameters affecting the runoff simulation. Then the hydrometeorological observation data from 1980 to 1986 were used to calibrate the model parameters, and the observation data from 1987 to 1990 were used for model validation. By comparative analysis of monthly runoff simulation value and observation data, the relative error, the determination coefficient and ENS coefficient during calibration and val- idation period were --18~, 0. 73, 0. 71 and 12%, 0. 76, 0. 72, respectively. The evaluation results demonstrate that the SWAT model has good reliability and suitability for the runoff simulation in Sanshuihe basin, and it can be used as one of the support model for the integrated management of water resources in the basin.