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Reservoir management system


Time:

2023-06-21

Reservoir management systems are a central part of modern reservoirs and an important part of their effectiveness. The operation of reservoir gates during floods is based on operating rules that do not cause disasters downstream.

Reservoir management systems are a central part of modern reservoirs and an important part of their effectiveness. The operation of reservoir gates during floods is based on operating rules that do not cause disasters downstream. In order to ensure the correct flow of information, it is necessary to grasp and monitor the inlet flow and project conditions, and to estimate the operation of the reservoirs according to the actual situation and find out the appropriate countermeasures. In the case of a group of reservoirs, the conditions of all the reservoirs and each of the reservoirs are taken into account.

Firstly, when operating at low water level, the storage and release flow must be determined separately. Based on the operational judgement, the release flow is implemented and operational procedures are developed. For this purpose, information on rainfall conditions, reservoir inflow, storage and release flows are collected and analysed in a comprehensive manner. For the analysis of the incoming flow, if a flood occurs, the incoming flow should be predicted based on the upstream rainfall, river level, and the arrival time of the flood, and the operational regime and countermeasures for water level return should be determined based on the predicted incoming flow and storage volume. Predicting the release of flow will lead to a variety of results, and skilled managers can filter out the more accurate results. Secondly, the determination of the storage and discharge plan is carried out. Firstly, observation equipment for rapid collection of rainfall and flow is installed in the control station, and the information processing workstation in the integrated control station can fulfil the functions of auxiliary director technicians, such as forecasting of incoming flow, flood retrieval, and simulation of operation of individual reservoirs. Using the incoming flow forecast function, it is possible to forecast the upstream production flow for a maximum of six hours based on the collected rainfall, forecast rainfall and flow. Adopting the flood retrieval function, it is able to retrieve floods with similar rainfall conditions and forecast the scale of floods that will occur by using the information on flood and rainfall characteristics that has been collated and stored in the past. When a flood occurs, it is necessary to make decisions and scheduling plans within a short period of time using judgement criteria such as hydraulics, hydrological data, rules, and experience.

For this purpose, the Reservoir Management System (RMS) has been introduced to enable rapid collation and computational processing of the various elements. The automated system of reservoir management takes the skills of experienced workers through an expert system and makes them concretisation and improves the level of management. One of the conditions for determining the decision-making policy is the presence or absence of floods, which is judged by credibility. The credibility is defined by the credibility of flood formation, flow production, and relief system. When inferring by the usual law, the countermeasure system is judged by multiplying and averaging the values between -1.0 and 1.0 by five equal parts. To predict the flow rate using fuzzy theory, the rate of increase/decrease of the observed flow rate is inferred using the primary equation, the rainfall is predicted using the storage and retention function method, and the variable prediction based on the measured flow rate is used to predict the flow rate using the fuzzy theory of the average of the values calculated by the above three methods. The inference is made by MIN-MAX method and the numericalisation of the conclusion is made by centre of gravity method. The final determination of the storage period and release flow rate is difficult to correctly grasp the arrival time of a certain flow rate in the early stage of the flood. The technical person who is the director of reservoir management makes plans from the point of view of ensuring safety based on similar situations that have occurred. Using the contents of these judgements, the predicted amount of inflow 3 hours before and the amount of inflow plus the storage and release flow obtained from the inflow of the reservoir are used to determine the flow rate. In the case of rainfall due to a typhoon, if the wind circle is only in one reservoir basin, the flood flow may come immediately. In the past, safety forecasts were made with reference to the range of typhoon approach forecasts, where the hazardous area was used as a reference to make additional release plans. Reservoir automation, is a field for further research, in some automatic control theory, such as fuzzy control is developing rapidly today, I believe that reservoir automation is not just the above automation, its concept will be more extensive, it will certainly apply some control ideas, so as to better solve the reservoir control problem.