涝渍地渔稻养作对区域排涝模数的影响研究

The Impact of Rice-fish Farming on the Drainage Modulus of Waterlogged Area

渔稻养作作为涝渍地利用的模式之一,在实践层面上取得了良好的效果,但在理论研究上缺乏定量分析。以四湖流域螺山排区为研究对象,采用CLUS-S模型制备不同的土地利用重分类图,通过SWAT对不同比例渔稻养作情景下的区域排涝模数进行模拟,得到了以下结论:(1)渔稻养作能较明显的减小年度区域累积产流量,且减小量随着渔稻养作面积所占比例的增加而增加;(2)雨型越小,渔稻养作对排涝模数的影响越明显;(3)排涝模数曲线曲率随渔稻养作面积比例增加而增加,说明渔稻养作所占比例越大,对区域排涝模数的降低效果就越明显;(4)模拟结果显示,在强降雨状况下,可能会出现排涝模数增大的情况。

Rice-fish farming, a new method of utilizing waterlogged land, has achieved good results at a practical level. However, a quantitative analysis of rice-fish farming in the aspect of theoretical research is absent. This paper studies Luo Mountain Drainage Area in Four Lake Watershed, utilizes the CLUS-S model to make different land use reclassification figures, and simulates the drainage modulus of the area with different rates of flee-fish farming through SWAT, and has drawn the following conclusions： （1） rice-fish farming can dramatically reduce the cumulative runoff in the area annually, and reduction increases with the rate of flee-fish farming increases; （2） the smaller the rainfall pattern is, the greater the impact of rice-fish farming to the drainage modulus is; （3） the correlation curve between drainage modulus and the rate of flee-fish farming illustrates that the drainage modulus reduces more clearly while the rate of flee-fish farming areas increases. （4） According to the simulation results, the drainage modulus might increase when the precipitation is high.