连云港市黑林小流域降雨侵蚀力分布特征研究

Study on distribution characteristics of rainfall erosivity in Heilin watershed of Lianyungang City

本文根据连云港市黑林小流域2013—2020年雨量、雨强和降雨历时等降雨资料,计算该区域降雨侵蚀力,并分析当地侵蚀性降雨特征,研究其分布特征及变化趋势。结果表明,降雨侵蚀力与雨量、雨强在P<0.01的水平上显著相关,年际间有增大趋势,并存在丰枯交替波动;侵蚀性降雨主要发生在汛期,7—8月是水土流失需要高度关注的时期,Ⅱ雨型和Ⅲ雨型是土壤侵蚀需要高度关注的降雨类型。该研究成果可为当地水土流失预测与治理、生态环境保护以及水土保持工作提供科学依据。

In this paper,rainfall erosivity is calculated based on such rainfall data as rainfall amount,rainfall intensity and rainfall duration in Heilin watershed of Lianyungang City from 2013 to 2020. The characteristics of local erosive rainfall are analyzed to study its distribution characteristics and variation trend. The results show that rainfall erosivity is significantly correlated with rainfall amount and rainfall intensity at the level of P< 0. 01. There is an increasing trend between years and alternating fluctuation between abundance and shrinkage. The erosive rainfall mainly occurs in the flood season. The period from July to August is a period requiring high attention for soil and water loss while the rainfall types Ⅱ and Ⅲ are the rainfall types requiring high attention for soil erosion. The research results can provide scientific basis for local soil and water loss prediction and treatment,ecological environment protection and soil and water conservation.