论文部分内容阅读
７０ 年代以来，黄河中游开展了大规模的水利水土保持工作，流域侵蚀过程和侵蚀强度有了很大变化，全沙模数与粗沙模数也发生了相应变化。总的变化趋势是：全沙模数与粗沙模数变小，高值区范围缩小。同时分析表明，水保工程抗御大洪水的能力有限，且不同流域治理程度不同，水保效益也不一样。
Since the 1970s, a large-scale water and soil conservation work has been carried out in the middle reaches of the Yellow River. The erosion process and erosion intensity of the watershed have undergone great changes. All sand and coarse sand modules also change correspondingly. The overall trend is: all sand modulus and coarse sand modulus becomes smaller, high value range narrowed. At the same time, analysis shows that the capacity of water conservation projects to resist floods is limited, and the degree of governance in different watersheds is different, and the benefits of water conservation are also different.