Abstract:

When the dam discharges water, huge flood takes a lot of gases and rushes down to the lower riverbed, which makes the total dissolved gas supersaturated especially near the dam area and has negative effect on downstream aquatic life. The gas bubble disease of fish is the typical symptom caused by gas supersaturation. In order to investigate the influence of dam discharge to the dissolved oxygen saturation in downstream, based on the measured data of the Three GorgesGezhouba Dam area in downstream near the dam the BP network prediction model of dissolved oxygen saturation was built. At the same time, the paper used the BP prediction model to simulate the dam downstream dissolved oxygen saturation at the different operating conditions of the dam. Through the comparison between the result of simulation to measured data and the result of numerical simulation, it was confirmed that BP network model could be a good approximation to the dissolved oxygen saturation in the appointed area of the dam downstream. By use of the BP network model，it can be predicted that the dissolved oxygen saturation of the dam downstream by different operation conditions of dam. So this model can provide the reference for the effective control of dissolved oxygen saturation in the downstream of the dam