利用人工模拟降雨法提高测钎法精确度

Increasing the Accuracy of Chain Pin Method by Artificial Rainfall Simulation

在一定的降雨条件下,采用人工模拟降雨法与测钎法计算土壤侵蚀量并进行对比,分析两者相关性,对测钎法进行校准,以提高该方法的精确度。在雨强40 mm/h、降雨历时30 min、坡度8°、地表覆盖度0、初始土壤容重1.23g/cm^3、土壤含水量14.79%的试验条件下,测钎法计算的土壤侵蚀量结果小于人工模拟降雨法计算的结果,两者相差19%~30%。相关分析结果表明,测钎法结果与人工模拟降雨法结果之间呈极显著的正相关(R=0.981,P<0.05)。通过建立回归模型方程y=1.431x-27.237,可对同类条件下运用测钎法的计算结果进行校正,使之更加接近真实的土壤侵蚀量。未来,进一步研究在不同条件下两者之间的关系,将为利用测钎法进行野外堆土坡面水土流失监测提供更加准确的数据支持和决策指导。

It calculated and compared the amount of soil erosion by using artificial rainfall simulation and chain pin method under certain conditions. Then,it analyzed the correlation between the two and calibrated the chain pin method for increasing the accuracy of the method. The calculated results of the amount of soil erosion by using chain pin method was smaller than that of artificial rainfall simulation and the difference range of the two was 19% ~ 30% under the conditions of rainfall intensity 40 mm/h,rainfall duration 30 min,slope 8°,vegetation coverage 0,initial soil bulk density 1.23 g/cm3 and soil moisture content 14.79%. The related analysis results show that between the chain pin method and the artificial rainfall simulation is highly significant positive correlation( R = 0.981 and P<0.05). Through establishing the regression model equation of y = 1.431x-27.237,it can correct the calculation results of the chain pin method under similar conditions and make the results are more close to the reality. In the future,further study on the relationship between the two under the different conditions will provide more accurate data support and decision-making guidance for soil and water loss monitoring of accumulated soil slopes in the fields.