Study On Method And Influence Of Reservoir Ecological Operation Improved The Adverse Effects Of Low Temperature Discharge Water

The main shortcoming of the existing reservoir operation mode is to pay attention to the socio-economic function of the reservoir, and strive to maximize economic benefits, but it ignores the downstream reservoir and the reservoir eco-system requirements. This paper studies the medium and long-term optimal reservoir operation considering ecological factors, combining ecological reservoir operation and optimal reservoir operation.The main research work and results are as follows:In this paper, take the Yalong river Jinping I Hydropower project as the background, take major provincial-level protection of fish as indicators of fish along downstream Jinping I Hydropower project, and inspected fish fauna composition in the reservoir area and downstream in field, perfect the investigation of fish habitat in Yalong river, carry out short-term observed trials and long-term controlled trial. Because blood indicators can reflect the biological properties and the normal physiological state, fish blood and body metabolism, nutritional status and disease are closely related, and level of digestive enzyme vigor affects directly the animals on nutrient absorption and utilization, environment adapt status can be found from the changes of digestive enzymes, through water temperature coercion experiment of fish, study the physiological response of fish from changes of the serum indicators and in digestive enzyme vigor under different temperature conditions, combined with relevant literature, identify the water temperature adaptability of fish, especially the water temperature requirements of spawning, provide basic data for reservoir ecological operation.In this paper, two-dimensional model of the reservoir water temperature are taken to study the influence of discharge water temperature when reservoir operation. Aim at discharged low water temperature of Jinping reservoir. In this paper, predict single inlet and stratified water conditions respectively discharge water temperature changes. The results show that compared with the single-intake scheme, stratified water scheme has higher discharged water temperature in spring, lower discharged water temperature in winter. Stratified water scheme is better than single-intake scheme by analyzing d downstream fish temperature habitat suitability criteria.It is closer to the natural water temperature process. Vertical river one-dimensional water temperature model is taken to simulate temperature distribution along the river. Compared with the single-intake scheme, river water temperature of stratified water scheme is recoveried quickly, which in a certain extent, reduce the negative impact of the low temperature discharged water on fish. Generally speaking, compared with the single-intake scheme, stratified water scheme is closer to the natural water temperature process, and is more propitious to maintain river ecological environment.This paper develops a reservoir optimal operation model based on runoff prediction. Optimization model includes long-term optimization model, middle term optimization model, and the coupling between long-term optimization model and middle term optimization model. Middle-term and long-term optimization model take all state increment dynamic programming algorithm as the optimization algorithm. The time span of long-term optimization model is one year, and the optimization period is one month. The time span of middle-term optimization model equal foreseeable period of runoff forecasting (3 to 7 days), and the optimization period is one day. The average monthly water level of long-term optimization model of the output has been interpolated for the average day water level, and it is set to termination of increment dynamic programming of medium-term optimization model, consequently achieves coupling long-term optimization model and middle-term optimization model. Results of application of this coupled model to optimize reservoir operation Jinping simulation show that design of coupling mechanism is successful. The trajectory of long-term optimization can be a good guidance to middle-term optimization.Hydraulic project impact factors of ecosystem services are classified by using the analytic hierarchy, and using jointly of multi-level fuzzy evaluation method. The AHP-FUZZY model of hydraulic project is established. The effect of ecological operation on ecosystem services function of Jinping I reservoirs is appraised. The importance of reservoirs ecological operation to maintain downstream ecological system is analyzed qualitatively, and the influence of reservoirs ecological operation on Jinping I reservoirs ecosystem services function economic value is also analyzed quantitatively by using economic evaluation method.