SCS模型在流域尺度水文模拟中的应用

Application of SCS model to hydrological simulation at an agricultural watershed scale

流域的产汇流是很复杂的水文过程,也是水文水资源领域的主要研究对象,采用SCS模型对我国湖北省漳河灌区新埠河-桥河流域的水文过程进行模拟研究,并根据该流域实际水文情况和下垫面条件,对模型进行改进.通过对SCS产汇流模型参数和结构进行调整,可以大大提高模型效率.将改进后的模型应用于该流域水文模拟,模型应用结果表明:率定期产流合格率可以达到75%,汇流合格率达到87.5%;检验期产流合格率达到80%,汇流合格率能够达到75%,大大改善了模型模拟效果.

It is very important to study of the water yield and concentration processes in agricultural watershed because it is the principal object in field of hydrology and water resources. The SCS model is used to simulate the hydrological processes in a humid agricultural watershed-the Xinbuhe-Qiaohe basin, which is located in the Zhanghe Irrigation District, Hubei Province, China. The model is modified according to the actual conditions of the watershed; and the simulation results and the applicability of SCS model are discussed. Firstly, the model is applied directly to the watershed; the results show that the qualification rate is as low as 21.1%. Then, through modifying the structure and the parameters of the model according to the hydrological conditions in the watershed, the simulation efficiency of the modified model is improved remarkably. In the calibration period （1956-1962）, the qualification rate of water yield process is as high as 75%; and that of the concentration process is as high as 87.5%; in the validation period （1963-1964）, the qualification rate of water yield process is as high as 80%; and that of the concentration process is as high as 75 %. Thus, the model is applicable in humid regions after modification.