Study On River Health Life Assessment And Restoration Technology

In the past decades, the river has been degraded and it's fuction has been declined because of human beings' unreasonable utilization, therefore, maintaining river's healthy life and realizing human-water harmony is our goal of river management in the new era. The study on the theory and practice has been highly valued by the state and relevant departments. Based on former research results, this thesis carried out theory study and practical application on river healthy life in terms of meaning, assessment and restoration. Main contents and achievements are as follows:(1) It described the natural and social characters of river ecosystem from different point of views, and discussed river healthy life from river power, river ecology, social economic development, environment protection and riverbed evolution. Based on these, it put forward that healthy river should meet the human need as well as taking into consideration the need of maintaining the river's own health. The meaning of river healthy life should include river's own life, social economy and watershed ecology. Based on existing achievements, it indicated river healthy status in terms of water quality, aquatic life, physical form, hydrology, streamside zone, social function and economy function.(2) Based on our nation's conditions and river characters, it proposed the principle when selecting river health index. According to the current river health status in China, it constructed eighteen specific indices that reflected river structure, river social economic function and river ecology function in different layers and classes, and put forward the assessment method for each index and five grades of standard character values. Thinking of the fuzziness of river health, it fixed index weight through layered binary compared expert analysis method, and evaluated river health by multi-objective fuzzy model. Taking Dongjiang as an example, it analyzed each index concerning Dongjiang's health and fixed related standard feature value and index weight, and analyzed the river health status from different layers and classes by using multi-objective Fuzzy Evaluation Model.(3) It analyzed the relationship between river degradation degree and restoration degree, and the restoration measure toward river with different degradation. On summarizing overseas researches, it put forward the meaning of river restoration dimension in our country, and constructed the general framework of restoration contents of different time and spatial dimension. After analyzing the main task of river restoration in China, it put forward the main contents and objective of establishing the diversity of river morphology and improving the hydro condition. According to the causes and status of river changes in China, it constructed the concept framework of river morphology restoration. Given consideration to human beings and river ecology, it put forward the character discharges of improving river hydrology and...