次降雨有效降雨量的影响因素及其估算模型

发布时间：2018-11-14 07:53

【摘要】：利用沧州市南皮生态农业试验站点2011—2013年不同土层深度的含水率及降雨量和降雨时间,结合由植株叶面积指数得到的不同生育期植株的截留容量,分析了最大容水量S和最大降雨强度二者与降雨有效性的相关关系,并在此基础上建立了次降雨有效降雨的估算模型。结果表明,土壤初始含水率与降雨有效性线性相关,且在不发生溢流情况下,可以用土壤最大容水量S作为是否考虑土壤初始含水率折减作用的分界点;另外,对于降雨强度I≥0.7 mm/min的降雨,降雨强度与降雨有效性相关性显著,并且随最大降雨强度的增大,降雨有效性逐渐减小;最后将运用传统模型和新估算模型计算的有效降雨量值与实测有效降雨量值验证对比,新模型比传统模型更加贴近实测有效降雨,并且降雨量较大时差别更加明显。
[Abstract]:Using the moisture content, rainfall and rainfall time of different soil depth from 2011 to 2013, and combining with the interception capacity of different growth stage plants obtained from plant leaf area index, Cangzhou Nanpi Eco-agricultural experiment station from 2011 to 2013 was used. The correlation between maximum capacity S and maximum rainfall intensity and rainfall availability is analyzed, and the estimation model of effective rainfall for secondary rainfall is established. The results showed that the initial soil moisture content was linearly correlated with rainfall availability, and the maximum soil water capacity S could be used as the dividing point to consider the reduction of initial soil moisture content without overflow. In addition, for rainfall with rainfall intensity I 鈮，

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