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Research on Quantitative Methods to Ecological Instream Flow Requirements of River

Author: FanJian
Tutor: LuGuiHua
School: Hohai University
Course: Hydrology and Water Resources
Keywords: River ecosystem runoff Suitable habitat theory The sectional weights can be utilized area RVA method Hydrological change index Environmental flow index
CLC: TV213.4
Type: Master's thesis
Year: 2006
Downloads: 439
Quote: 6
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Abstract


The determination of the river ecosystem runoff is a key issue in the allocation of water resources , which is the basis of the limited water resources in the degree of utilization of Ji fat . This paper summarizes the analysis of existing research results at home and abroad on the basis of a more in-depth study on the theory and methods of river ecological runoff . This paper analyzes the composition, structure , and function of the river ecosystem spatial and temporal scales ; hydrological elements from the magnitude , frequency , time of occurrence , duration and rate of change of five aspects of the ecological function of the river situation ; In conclusion, at home and abroad the river ecosystem runoff definition based on defined the river ecosystem runoff basic connotation ; river ecosystem integrity and continuity theory , analysis of the characteristics of the river ecosystem runoff should have . Summarize the river ecosystem runoff quantitative methods widely used at home and abroad on the basis of the theory , based on suitable habitat for aquatic organisms , explore the river ecosystem runoff calculation method based on ecological objectives . And hydrological stations in Guangdong Dongjiang Heyuan cross-section , for example , the empirical research . Calculated : the Dongjiang important economic species of cyprinids key study on the optimum flow range of 105m ~ 3 / s ~ 374m ~ 3 / s, and ecological runoff process of deducing the whole year according to the Heyuan station natural runoff characteristics . The integrity of the river ecosystem theory based , from the point of view of the restore important ecological functions runoff mode application RVA method to determine the calculation method of the river ecosystem runoff process . In accordance with the the RVA method of basic principles of human disturbance index of hydrological changes and the statistical characteristics of the environmental flow index as the river ecology runoff recovery parameters derived reasonable eco runoff process based on the principle to restore the natural runoff patterns , Still upstream of Dongjiang empirical research , this article identified Heyuan station different levels of annual minimum ecological runoff process and the appropriate eco - runoff process , and compared results with the application of more hydrological methods . The results show that the RVA law in regard to other methods to better reflect river runoff interannual variation during the year , reflecting the variation of river eco- runoff process in the time scale .

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CLC: > Industrial Technology > Hydraulic Engineering > Water resources in tune to check with the Water Resources Planning > Water Resources Development > Water resources management, protection and transformation
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