Construction mode of urban water Ecosystem and ecological restoration

Urban water Ecosystem is threatened by its surroundings with urban area spreading, and the environment protection and water pollution control are the vital problems needed to be resolved in China. A totally analysis was made on the deficiency in flood protection standards, the shortage of water supply, the lack of ecological water demand, the deterioration of water environment, the decreasing proportion of water body invaded by buildings in city, the ignorance of scenery construction, culture demonstration and economy development related to water ecosystem. Aiming at these facts, an urban water environment and ecosystem construction mode, which integrates water security, water environment, water scene, water culture, and water economy, was put forward. It consists: water security system construction of flood control, water supply, ecological water demands, and water quality; restoration the spatial forms of rivers and lakes, water pollution control and water ecosystem restoration; water scene design; water culture exploitation and water economy activity development. And, in addition, experiments were taken to study the relationship between water body and microclimate in urban area. Furthermore, suitable water proportions in a large number of cities in China were proposed based on eight items through Fuzzy Evaluation Method. A practical example was applied in Lianyungang City, Jiangsu Province. According to the characters of water environment and ecosystem, an adaptable construction mode was established to make sure flood protection and other security items carried out smoothly, to develop technologies for pollutants control, clean water importing, and riparian plants rehabilitation which will be helpful for the improvement of water environment quality, and to lay out five water scene lines, water culture and economic exploitation sights, which can exhibit the distinguished synthesized characters of "mountains, rivers, reservoirs and sea" and will provide a comfortable, relaxed and natural spaces for travelers and residents. As for the severe pollution status in some of the urban rivers, clean water importing scheme was formulated to improve water quality and self-purification capability of these rivers.