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我省西山地区,大部分是残垣和破碎丘陵,由于历代反动统治阶级的残酷剥削压迫和严重的水土流失,土地已遭到严重的破坏,梁峁起伏,沟壑纵横,地形破碎,十年九旱,沟壑面积已占到总面积的百分之四、五十,年侵蚀模数每平方公里达八千至一万二千吨,沟梁界限很难严格分开,沟底下切,沟头前进,沟壁坍塌已成为导致梁垣坡地继续破坏和河川滩地冲毁的基本根源。在这些沟蚀现象中,沟底下切是主要的。沟冲深了,就要求相应的宽度和它保持平衡。所以沟壑坍塌和沟头前逆往往是伴随着沟底下切而产
Due to the brutal exploitation and oppression of the reactionary ruling classes of all generations and the serious soil and water loss, the land has been severely damaged. The beams and valleys are undulated and ravaged, and the terrain is fragmented. The ten-year-long Drought and gully area accounts for 4% and 50% of the total area. The annual erosion modulus reaches 8,000 to 12,000 tons per square kilometer. It is hard to separate the ditch and beam boundaries strictly. , The ditch wall collapse has become the leading cause of the continued destruction of the Iridium slope and river beach washed away the basic source. In these gully erosion, undercut ditches are dominant. Ditch deep, it requires the appropriate width and it to maintain balance. Therefore, the collapse of gully and ditch before the inverse is often accompanied by the ditch cut and produce