今年国内的大洪水，损失惨重。据专家分析，今年长江洪峰的流量并不是历史上最高的，而水位却创下历史最高纪录。原因之一，是长期水土流失造成泥沙淤积，河床抬高。在我国，目前水土流失面积已达３６７万平方公里，约占国土面积的３８％，其中水蚀面积达１７９万平方公里... The floods in China this year have suffered heavy losses. According to expert analysis, the peak flow of the Yangtze River this year is not the highest in history, while the water level has hit the highest record in history. One of the reasons is that sedimentation caused by long-term soil erosion and river bed elevation. In our country, the area of ​​soil and water loss has reached 3.67 million square kilometers, accounting for about 38% of the total land area, of which the water erosion area reaches 1.79 million square kilometers.