Analysis Of Landscape Ecological Mechanism And Management Study Of Reclamation Causing Disasters In The Estuary

Reclamation is an important means for increasing the land resources, but over-exploitation will break the configuration of mudflat wetland, and often prick up the disaster of flood and typhoon of the town in the area upper estuary. Reclamation also will break the balance of the wetland ecosystem, reduce the biological diversity of lowered, and affect the normal cycle of the environment. Based on the theories of landscape structure and function, landscape sensitivity etc, this thesis analyzes why the disaster of flood and waterlog is being agravated by reclamation at the estuary mudflat ,and analyzes the effect on landscape ecological function, by the research of the disasters like flood and waterlog in Zhejiang province at several decadeses ,and the variations of disasters taking place before and after reclamation in the towns near the upper stream of qiantang river's estuary, and the variation in characteristic in hydrology such as water level in tide inshore of Qiantang river. The thesis also analyzes the relationship of hydrological disaster occurrence and landscape structure in the natural estuary and gulf ,and the relationship of residential security and morphology of the natural estuary and gulf. Then it forecasts the influence on the function of prevention disaster in Zhuyou stream basin after the yanzhan reclamation project execution in the Sanmen county Zhuyou stream estruary. At last, the thesis provides a scientific reform mode of reclamation for the purpose of keeping the hydrological balance of river basin, and of preventing and reducing disasters, coupled with the protection of the characteristics of landscape esthetics and biodiversity.