大汶河上游小流域降雨类型及其对产流产沙的影响OA北大核心CSTPCD

[Objective]The rainfall regimes and their effects on runoff and sediment yield in the small watershed of the upper reaches of Dawen River were studied,in order to provided a theoretical basis for the predicting and early warning of flood control and soil erosion in the mountainous and hilly areas of Central and Southern Shandong Province.[Methods]The Culai Mountain watershed in the upper reaches of the Dawen River was selected as the study area.K-means clustering and multiple linear regression analysis were employed to examine different types of rainfall and their impacts on sediment yield using rainfall,runoff,and sediment yield data from 2021 to 2023.[Results]The rainfall in this basin can be divided into four types,categorized as follows:type Ⅰ features small amounts of precipitation with low intensity,type Ⅱ features medium amounts of precipitation with moderate intensity,type Ⅲ features heavy amounts of precipitation with high intensity,and type Ⅳ features extra heavy amounts of precipitation with moderate intensity.Rainfall in types Ⅲ and Ⅳ was the main source of runoff and sediment yield in this basin.[Conclusion]The Culai Mountain watershed mainly experiences light rainfall with low intensity,yet the frequency of rainstorms remains relatively high.Affected by the mountainous terrain,the Ⅳ type rainfall was significant sources of regional floods and debris flows.Rainfall Precipitation amount is the primary influencing factor for runoff and sediment production in this basin.