Research Of Unsteady Flow At Lower Lock Approach Of Siyang Tri-locks

Studies on the characteristic of unsteady flow at lower lock approach deserve regards from the aspect of theoretical research and actual practice consideration. The pattern of flow of lower lock approach is usually complicated due to the influences of the interaction of flow underpoured from different locks. Generally, physical model is applied to study the current field for the case of irregular boundaries and complex flow pattern.Except for research on the unsteady flow at lower lock approach in Siyang, Jiangsu province by physical model, a two-dimensional numerical model is developed to explore the alternate research method in this paper. Through studying the project using physical model and numerical model simultaneously, the governing equations, numerical algorithm and the computation accuracy of the numerical model are analyzed. Comparison between computed results and experimental data gives that computed results is well agree with measured data under several water level cases, which indicates that the numerical model is valid and reliable.Based on discussing methods to study the characteristic of unsteady flow at lower lock approach, several improved project proposals are provided, and then the alternate proposals are tested using both physical model and numerical model. Results show that the improved proposals can effectively lower the raised level of reversed head at No.2 lock. Combined with the construction programming of No.3 lock, further studies on the flow pattern at various locks are undertaken. To the actual conditions of Siyang locks and taking various effects into consideration, engineering measures which are expected to ameliorate the pattern of flow at lower lock approach are propose...