基于 SRFR 软件垄沟灌土壤水分入渗参数反推方法评价

摘要

以民勤绿洲沟灌水流推进试验实测资料为依据，建立了垄作沟灌土壤水分入渗Kostiakov模型，并利用WinSRFR数值模拟软件反向率定沟灌Kostiakov入渗模型中入渗系数 k和入渗指数α，模拟分析不同沟底宽灌水沟裸地条件下水流推进和消退过程，并通过实测与模拟的水流推进过程相匹配来反向率定在动水头影响下的土壤入渗参数。结果表明，通过相对误差 K、均方根误差 RMSE以及不同灌水沟在30 cm处的水深变化过程来评价得到的入渗参数的精确度，表明利用大田实测与WinSRFR模型反推的入渗参数模拟的水流推进和消退过程较为一致。WinSRFR软件反推法求得的沟灌土壤水分入渗参数模拟结果满足试验精度要求，大大减小了入渗参数确定的工作量。%Based on the measured data of furrow irrigation test in Minqin oasis ,the Kostiakov model of soil water infiltration was established ,and the infiltration coefficient k and infiltration coefficient αwere calculated by using back-stepping method with the software WinSRFR .The water flow advance and recession process under bare ground condition with different width of furrow bottom was simulated ,and the soil infiltration parameters influenced by moving water head were determined by matching the measured and simulated water flow advance process .According to the relative error (K) ,root-mean-square error (RMSE) and accuracy of infiltration parameters evaluated by the change process of water depth in different irrigation furrows ,it was indicated that the measured results were much coincident with the water flow advance and recession process simulated with the infiltration parameters that were calculated by WinSRFR model .The simulation results of infiltration parameters of soil water under furrow irrigation obtained by backstepping method with the software WinSRFR could meet the accuracy requirements of the test ,which greatly reduced the workload in determining infiltration parameters .