Study On Hydraulic Characteristics Of Mutual Irrigation Shiplock

The development of the inland river shipping demand for logistics is increasing day by day and the existing lock freight volume is far from meet the needs of the ability. Therefore, in recent years, there have been a large number of new constructions and expansion of second-line, three-line and four-line shiplock in our country. But for the inland river with water shortage in dry season, the contradiction among the shipping, power generation and irrigation water is more prominent. How to save the ship lock water consumption and increase its carrying capacity is the urgent problem of the new construction and expansion shiplock. Previous domestic studies on double line mutual irrigation water saving lock mainly aims at the specific arrangement of its own, but not on the operation mode, lock capacity under double running, the relationship between the efficiency of power generation water quantity and water saving etc. There is no such lock first listed abroad and no engineering practice experience of this type water conveyance in the domestic. So the study on this field is very necessary.This project put the Feilaixia second and third line locks in Beijiang river of Guangdong as the research background, according the double lock key technical problems in the process of mutual irrigation, through the numerical simulation and physical model test method, study the valve operation mode, the hydraulic characteristics, ship berthing conditions and corridor pressure, the relationship between water saving and power etc. The main research results and conclusions are as follows:1. The characteristics of water under different valve opening were observed. Under the double lock water running, the main culvert valve has always been to even open as tv1=5min, and the connecting corridor valves to even open as tv2=3min and open the main water when the level difference in the range of 0.4m~5m, Considering the model scale effect, lock filling and emptying time of two kinds of operation mode can meet the design requirements for 15 minter.2. Under the two kinds of water operation mode, the hydraulic characteristics curve got by numerical simulation calculation and physical model experiment fits well, and has a certain regularity. The water level lines are rising or faling type curves, and the rising or faling rate under single normal operation is faster than double. The chamber flow process line under single normal operation is a single peak curve, and the double water running into double peaks. And the peak value is larger than the latter.3.In the recommended valve opening and closing mode, under the single normal operation, the lock chamber design of ship longitudinal force is 7.68 k N, the maximum lateral force 10.10 kN. After the water filling and drainage valve at the top of the corridor, the minimum pressure of about 2.6m and 1.5m of water. Double water running conditions is better than the single normal operating conditions, and the single normal operating conditions play a control.4. Under the double lock water saving operation, the lock capacity is proportional to the lock head between the two chamber, and the rate of water saving is inversely proportional to it. When the near futures currency volume is small, the valve is closed when the two chamber water level difference of 0m, water saving rate of 48.6%. When the freight volume increases, the two chamber water level difference for 4.0m operation, and the water saving rate is 38.5%. The power generation benefit of water is 2640000 Yuan per year.5. The results of the study not only solved the key technology problem of ship lock hydraulics for Feilaixia two and three lines shiplock in design and construction, improving our country in the field for research, design and construction, but also provided the technical basis for the design and management of water saving lock. Therefore, the research results can provide reference for other similar multi line water saving locks on navigable river for development and construction; the research results have very broad application prospects.