Study On Ecology Health Evaluation And Repair Technology For River In HeBei Province

Rivers have been playing a vital role for the development of human society. With the development of social and economic, the river water resources using has become more and more irrationally, the river ecological environment has been damaged seriously. From the point of sustainable development and the harmonious coexistence of water and people, the repair of the ecological environment has become more and more urgent and the repair of environment has become a main task for water conservancy construction. According to the analysis of the present situation of Hebei six river system, the river ecosystem health status was evaluated and analysed reasonable by using the composite index method, the river ecological restoration techniques was summarized according to health problems existing in the river, and the ecological restoration was designed for applications in Luan River (Luan Xian section). Main content and conclusions as follows:(1) According to the water resources allocation and the most prominent problems, six rivers system was evaluated objective and rationally by the 11 indexes of river ecological environment situation, river flood situation, river water resources situation. Results showed that the health status of Luan River, Beisan River, Yongding River, Daqing River, the north of Zhangwei River was sub-health, sub-health, unhealthy, sub-health, unhealthy, unhealthy. The main reasons were: river water resources were developed excessively; reservoirs and sluices were built upstream causing the inflow of middle and lower reaches decreasing seriously and rivers hydrological conditions were discontinuous; the river water environment was damaged by the massive pollution discharge into the river; natural vegetation in the basin or around the river were destroyed causing serious soil erosion.(2) According to the analysis of the reasons for the damage of the six river in Hebei province, the methods for the recover of river blanking, the repair and improve of the river water quality, the restore of fish diversity, the improve of the river passage capability, the protection of river bank and the mend of river buffer zone was put forward. The problems in the main section of the river system was analyzed and summed up. The key and methods of repair was discussed using the methods of ecological water supplement, water pollution control and purification technology, using the green plant instead of water, etc.(3) The corresponding ecological restoration design was made with the application example of Luan River (Luan Xian section) combined with ecological restoration, landscape design and river regulation. During the design process, certain reference value was provided by the theme of river regulation and ecological restoration, the landscape design idea of soft, the methods of the bond with ecological, water conservancy and landscape.The basic theory of the river health assessment and ecological repairment was perfected by the results in this passage which has a certain practical significance to the ecological restoration of the six river system in Hebei province.