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土壤侵蚀是河流挟沙的主要来源，而土壤的酸性情况与泥沙粗细有关，本次统计了酸性土壤地区有实测或设计中值粒径ｄ５０的２７个大中型水库的ｄ５０，并主要根据 土壤地理中各酸性土壤的ｐＨ值、酸性情况及细颗粒占百分数等因素，确定了泥沙 酸性程度Ｓ与中值粒径ｄ５０的关系。
Soil erosion is the main source of sediment in the river. The acidity of the soil is related to the sediment thickness. This time, the d50 of 27 large and medium-sized reservoirs with measured or designed median particle diameter d50 in acidic soil areas are counted and mainly based on the soil Geographical pH value of each acidic soil, acidity and the percentage of fine particles and other factors, to determine the degree of sediment acidity S and median diameter d50 relationship.