基于3个站点校准与验证的晋江流域径流模拟

 应用分布式水文模型SWAT,对东南沿海晋江流域内3个水文站点的年、月径流和基流分别进行模拟。选取1972—1975年作为模型校准期,以效率系数、平均误差、相对误差和决定系数为评价指标,率定出6个模型敏感参数,并用1976—1979年的资料进行模型验证。结果表明:利用3个站点模拟的方法可以从流域尺度上更客观地率定模型参数,改善模型的模拟效果;模型在东南沿海流域的模拟效果较好,精度较高;模拟期内降水量的差异以及水库年径流调节均会对水量模拟结果造成影响。

Runoff simulation with calibration and validation of three stations in Jinjiang River basin

Simulated with the distributed SWAT(soil and water assessment tool) model,annual water yield,monthly streamflow and baseflow of three gauging stations in Jinjiang River basin,which is located in the southeast coastal of China,were evaluated.The model was calibrated with the measured runoff data of 1972—1975,and six sensitive parameters were determined.The simulation results were evaluated by E_ns,M_m,Er and R₂.The model was further validated with the runoff of 1976—1979,which provided excellent results.It showed that the calibration and validation with three stations results in more realistic parameter values across both the hydrological processes and the geographic areas,and improved the simulation efficiency.SWAT model could be successfully used to simulate the runoff in the southeast coastal watershed.Better results can be obtained if the simulation with wet condition data(above average rainfall for the river basin) than with dry condition data(below average rainfall). In addition,during the low-flow period,the reservoir operation has a great affect to the simulation results.