人类活动对河口地区的影响

Special geography region in mouse of river, causes its intensive population and high progressed economy .There exsits special sediment problems, water and ecological environment problems etc in the join of rivers and oceans .Then , the article is to introduce the water and sediment ’ s particularity in the mouth of Yellow River、Yangtse River、Haihe River、 Zhujiang River、Qiantangjiang River . Meanwhile , with the increasingly people’s activities , which does some effect to each estuary . Aim at the existent problem, the exploitation of development of the estuary should look after both sides in the economy, mankind, environment, then which can develop the biggest synthesizing benefits.