Flood Control and Environmental Improvement of Hankou Beach

摘要

(1) According to the test results in immovable bed and mobile bed, scheme 3 (with the regulation length of 7km, the width at Yiyuan Road of 160m, the elevation of 28.80m, and dredging in the construction section) is recommended because its better comprehensive economic benefit. However, the back silting will happen in the dredging area, with the back silting of about 20% in common hydrologic year. Therefore, the dredging measure shall be taken to ensure the flood control benefit of regulation works. (2) The regulation works of Hankou beach is determined to put the flood control, environmental improvement and landscape establishment first, also give consideration to navigation, bank line utilization, urban communication, urban reconstruction planning and schistosomiasis prevention. The green riverside park, putting rest and recreation first is designed. After completion of the works, the environmental benefit, flood control benefit, and social and economic benefit will be great. The regulation works of Hankou beach will be the precedent of channel regulation for riverside cities along Changjiang main stream, it is an event of profound significance. (3) The unifying of human being and nature, the protection of water resources and ecological environment are the targets of sustainable development in the new century and the trend of world development. The human activities must be coordinated with the development of river. The environment is the essential guarantee of sustainable development, so the sustainable development shall be on the basis of constantly available resources and fine ecological environment. The flood control and environmental improvement of Hankou beach conform to the above mentioned views.