ass日本风韵熟妇pics男人扒开女人屁屁桶到爽|扒开胸露出奶头亲吻视频|邻居少妇的诱惑|人人妻在线播放|日日摸夜夜摸狠狠摸婷婷|制服 丝袜 人妻|激情熟妇中文字幕|看黄色欧美特一级|日本av人妻系列|高潮对白av,丰满岳妇乱熟妇之荡,日本丰满熟妇乱又伦,日韩欧美一区二区三区在线

Raindrop-impact-induced erosion as the beginning of soil erosion had significant impact on the whole erosion process. In order to systematically understand the effect of rainfall characteristics on splash characteristics of Beijing, artificial rainfall experiment was conducted. Rainfall intensity, rainfall kinetic energy and duration of raining time were chosen to analyze the splash regulation. The characteristics of splash distance and fragment size distribution were also tested. The results of rainfall caused splash erosion indicated that during the splash erosion process, the quantity of splashed soil particles in down slope had a significantly larger amount than that of the up slope, while the quantity of up slope was the smallest of all the four directions. The amount of total splashed particles and net splashed particles were all positively related to rainfall intensity. Quantity of splashed soil particles was significantly positively correlated to rainfall intensity and rainfall kinetic energy, respectively. The quantity of splashed soil particles was exponentially increased with rainfall intensity. And a linear function could show the relationship between quantity of splashed soil particles and rainfall kinetic energy. The rate of total splashed soil particles decreased exponentially with duration of raining time. The splashed fragments distributed mainly in 0~10cm of the study plot, which accounted 45.4%~57.75% of the total splash erosion, while that in 50~60cm of the plot was less than 1.75%. The quantity of splashed particles was exponentially decreased with splash distance. The splashed fragment size distribution showed that fragments smaller than 2mm were transported by raindrop impacts. The mass percentage of splashed soil particles with size of 0.02~0.05mm and 0.05~0.2mm was similar to that of the texted soil. The content of fragments with size less than 0.02mm was higher than that of texted soil, while the content of fragments with size of 0.2~2mm was lower. The mass percentage of particles with size of 0.05~0.2mm was the most, while the mass percentage of particles with size less than 0.002mm and size of 0.05~0.2mm were the least. Theoretically，the quantity of splashed soil particles with certain fragment size distribution of soil reached the peak. The percentage of splashed soil particles with size less than 0.05mm increased with rainfall intensity, and then almost kept the same. The percentage of splashed soil particles with size of 0.05~0.2mm was negatively correlated with rainfall intensity. The percentage of splashed soil particles with size of 0.2~2mm increased with rainfall intensity. Splashed fragment size distribution kept the same when rainfall intensity was large enough. The amount of five kinds of splashed soil particles were all exponentially decreased with splash distance with high correlationship respectively, which was the same as that of total amount of splashed soil particles. Mean size distribution decreased with splash distance under the same rainfall intensity. Mean size distribution was significantly higher under 121.4mm/h rainfall intensity than other three rainfall intensities. The changing rate of mean size distribution was large in 0~30cm from the study plot, and the changing rate decreased as the splash distance increased.