降雨特征因子与坡面土壤侵蚀关系分析

Analysis of the Relation Between the Characteristics Factors of Precipitation and Slope Soil Erosion

以沪(上海)陕(陕西)高速公路信阳至南阳段填沙路基边坡为研究对象,运用径流场法建立了21个径流小区,对边坡的降雨特征因子与坡面土壤侵蚀关系进行了定量分析。结果表明:侵蚀性降雨量、侵蚀性平均雨强均与土壤侵蚀量存在较强的相关关系;降雨侵蚀力值与土壤侵蚀量存在很强的相关性;降雨量级与土壤侵蚀量有较强的相关性,降雨历时与土壤侵蚀量无明显的相关关系;侵蚀性降雨的前3、5、7 d降雨量与土壤侵蚀量的相关性均较差。该分析结果可为提高土壤侵蚀预测预报的准确性、有效预防和降低路基边坡土壤侵蚀提供科学依据。

Using the sand-filled subgrade slope at Xinyang to Nanyang area in Shanghai to Shanxi highway as research object. 21 runoff plots were established by runoff field and the relation between the characteristics factors of precipitation and slope soil erosion was quantitatively analysed. The results showed that there was a strong correlation between the erosive rainfall amount, the erosive average rainfall intensity and the amount of soil erosion, rainfall erosivity R value and the amount of soil erosion, as well as precipitation level and the amount of soil erosion, there was no evident correlation between the duration of rainfall and the amount of soil erosion. There was a poor correlation between precipitation of 3,5 and 7 days before erosire rainfall and amount of soil erosion. The analysis results can provide scientific basis for improving the accuracy of soil erosion prediction, effectively preventing and reducing soil erosion of subgrade slope.