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降雨是导致水土流失的主要动力,一般采用降雨侵蚀力(用R表示)定量评价降雨对水土流失的影响。R的经典算法精度高,但繁琐复杂且所需资料不易获得,因此如何在保证精度的前提下降低计算的复杂度是建立R值简易算法的关键。以长汀县若干站点近年的降雨观测数据为依据,以经典算法的结果为参照,利用多元回归分析方法,提出了福建省长汀县的R值新简易算法,并运用此算法计算了该县的R指标,然后分析了该指标值在县内的时空分布及其与水土流失的关系。结果表明,所提简易算法的精度明显高于针对该地区的同类研究成果,所得分析结论符合实际情况。
Rainfall is the major driving force behind soil erosion. Rainfall erosion (R) is commonly used to quantitatively assess the impact of rainfall on soil erosion. The classical R algorithm has high precision, but it is complicated and complex and the required information is not easy to obtain. Therefore, how to reduce the complexity of calculation under the premise of ensuring accuracy is the key to establish a simple algorithm of R value. Based on the rainfall observation data of several sites in Changting County in recent years and using the results of classical algorithms as reference, a new simple R-value algorithm for Changting County in Fujian Province was proposed by using multiple regression analysis method. Using this algorithm, The index of R and its distribution in the county and its relationship with soil erosion. The results show that the precision of the proposed simple algorithm is obviously higher than that of the similar research results in this area, and the conclusion of the analysis is in line with the actual situation.