Study on Influencing Factors and Variation Rules of Rainfall Runoff Production in Wudaogou Area of Huaibei Plain
Based on the measured data of 106 rainfall runoff from 1972 to 2021 at Wudaogou experimental station,re-gression analysis was used to investigate the impact of the sub-rainfall P(heavy rain,heavy rain,moderate rain),ground-water depth H0(class Ⅰ:0-0.4 m,class Ⅱ:0.4-0.8 m,class Ⅲ:0.8-1.2 m,and class Ⅳ:>1.2 m)and the antecedent in-fluence rainfall Pa(class Ⅰ:17%～20%,class Ⅱ:20%-23%,class Ⅲ:23%-26%,class Ⅳ:>26%)on the runoff produc-tion at different scenarios,and a multiple regression calculation model was established.The results show that the precipi-tation plays a major role in the influence of rainfall runoff,followed by the groundwater buried depth before the rain and antecedent influence rainfall.Under different rainfall levels,there was a quadratic curve function relationship between the rainfall and runoff in the rainstorm scenario,a cubic curve function relationship in the heavy rain scenario,and a cubic curve function relationship in the moderate rain scenario when the long-term continuous rainfall type with P>35 mm,Pa>20%and H0<1.0 m could produce runoff.In the pre-rain groundwater depth scenario of grade Ⅰ and grade Ⅲ,the relationship between sub-rainfall and runoff is cubic curve function,the relationship of grade Ⅱ is quadratic function,and grade Ⅳ is linear function.The relationship between secondary rainfall and runoff is a power function in class Ⅰ,a cubic curve function in class Ⅱ,and a quadratic curve function in class Ⅲ and class Ⅳ.Through statistical analysis of the measured rainfall data,the runoff depth can finally be expressed as the function relationship of three factors:secondary rainfall,groundwater buried depth before rain and antecedent influence rainfall.The runoff calculation models of rain-storm,heavy rain and moderate rain scenarios were established,and the goodness of fit R2 is greater than 0.80,which can be used to predict rainfall runoff in Huaibei Plain.
rainfall runoffrainfall levelgroundwater buried depth before rainantecedent influence rainfallHuaibei plain
万方数据
维普
