1. The processes that are both artificial denudation and artificial accumulation to original geomorphy were uninterrupted, and original geomorphy was eroded by floodwater.
   我国绝大多数挡水工程仍是各种土料堆筑而成,它们在抵御洪水突袭时,常有渗漏穿孔险情发生而使人措手不及。
2. The paleo-geomorphy before the sedimentary of the Permian formation is recovered with the Moulage method, then the karst geomorphy unit is partitioned.
   采用印模法恢复出本区二叠系沉积前的古地貌，划分出岩溶地貌单元，古地貌恢复表明，研究区古地貌总体表现为起伏不大，西高东低，相对高差最大约130米。

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