农田水分转化模型参数优选与应用

Application and Optimization of Parameters of Farm Moisture Conversion Model

本文介绍了农田水分转化关系模型参数的确定方法。以在北京市水科所试验站观测的不同灌溉水平条件下的土壤水分资料为依据 ,进行了参数优选实例计算。并用该模型及其参数求得了该站 1 995年冬小麦不同灌溉供水量条件下的腾发量与根区下界面水分通量。该模型参数求解方法 ,对于充分利用大量的田间土壤水分观测资料研究农田水分转化规律和农田高效用水技术具有十分重要的意义。

In this paper,the method of determining the parameters of the farm moisture conversion model is introduced.The model is constituted by a soil moisture balance submodel,a precipitation(or irrigation)infiltration submodel,a crops evapotranspiration submodel and a moisture flux submodel of lower interface of root zone(See Wang Yangren,Yang Lixia,“Study on Farm Moisture Composition and Its Conversion Relationship Model”,Journal of “Shanxi Hydrotechnics”No.1[Total No.131],Feb,2000,pp 58-62).According to the observation data of soil moisture under different irrigation regime in the experiment station of Beijing Institute of Hydraulic Research,the farm moisture conversion models parameters had been optimized and thereafter,by the model and its parameters optimized,the evapotranspiration and the soil moisture flux on the lower interface of the root zone under different irrigation regime were obtained for the winter wheat in the experiment station in 1995.The method of determining the parameters of the farm moisture conversion model is of great significance to study the farm moisture conversion pattern and the high efficiency water use on farm by making full use of a vast amount of the farm moisture observation data.