人类在向自然界挑战的过程中,兴建了为数众多的水利工程,这些工程担负着兴利除害、造福于民的重任。然而,人类在大兴土木时,却往往忽视了这些工程改变水系及水的分布之后所带来的环境问题,难怪自然界冷漠无情了。建国后,我国兴建了大量的堤防工程,众所周知,堤防工程是防止洪水泛滥的屏障,是最重要最广泛的防洪措施,但是它也会带来某些不利影响。如洞 In the process of challenging nature, mankind has constructed a large number of water conservancy projects, which bear the heavy responsibility of cutting taxes and eliminating pests and benefiting the people. However, when human beings are greatly prosperous, they often neglect the environmental problems caused by these projects after they have changed the distribution of water systems and water. It is no wonder that nature is indifferent. After the founding of New China, a large number of dykes were built in our country. As we all know, the dyke works are a barrier to prevent flooding and are the most important and extensive flood control measure. However, it will also bring some adverse effects. Such as holes