YEJW Main Canal Risk Identification And Key Risk Events Water Depth Simulation

YEJW main canal is an important project to solve the water shortage in Urumqi and Beijiang oilfields..With the increasing dependence of water users on water conveyance projects,it is of great significance to study engineering risks and hydrodynamic models for ensuring water safety in water receiving areas.The paper establishes an analysis model of risk factors and risk events,and through the literature and research to summarize the possible risk events of the YEJW main canal identify the risk factors affecting the water volume and water quality during the operation process through different risk identification methods.And through the risk factor and risk event model,the risk factors that are prone to occur in the YEJW main canal and the risk factors that affect the safe operation of the project are analyzed.The hydrodynamic model of YEJW main canal was established by using MIKE11 software,and the accuracy of the model was evaluated.The model was considered to have high precision and meet the research requirements.According to the characteristics of the channel landslide,four kinds of landslide landslide scenarios are set up,the hydrodynamic model after the channel landslide will be established,and the variation of the water surface line in the channel after the landslide will be analyzed.The paper has the following conclusions:(1)Possible risk events in the YEJW main canal include open channel landslide,open channel slip,open channel subsidence,open channel flood top,open channel runway,open channel seepage,tunnel seepage,tunnel collapse,tunnel water inrush,aqueduct slip overturn,aqueduct 14 kinds of leakage,aqueduct flooding,gate failure,water pollution.(2)The risk factors affecting the water quality of the YEJW main canal include heavy rain,snow melting flood,freezing damage,earthquake,debris flow,excessive temperature difference,weak surrounding rock,support damage,bad soil,groundwater level,and sediment.There are 17 risk factors for siltation,man-made damage,improper control,power failure,gate deformation,mechanical and electrical equipment failure,chemicals or petroleum.(3)Among the 17 risk factors and 14 risk events of YEJW main canal,the three risk factors of freezing,heavy rain and snowmelt flood are the most likely to affect the project operation,and channel landslide is the most likely risk event.(4)When the open channel 0+000～7+283 section roughness is 0.015,the9+185～48+000 section roughness is 0.016,the 48+000～57+300 section roughness is 0.021,the tunnel roughness is 0.013,and the control gate shrinks.When the coefficient is 0.63,the model simulation value and the measured value are better.The water level simulation error is between 5 and 6 cm.The absolute percentage error of the model is about 1%,and the correlation coefficient is greater than 0.9.(5)The influence of different landslide forms on the water depth and upward influence distance in the channel is from full to small,all sides are slumped,both sides are partially slumped,all sides are completely slumped and one side is partially collapsed;the water depth is mainly affected by the landslide The influence of flow rate and landslide form,and the initial sedimentation height of the slope and the water head ratio of the landslide body increase linearly.(6)The water depth and height calculated by the basic formula of hydraulics are not much different from the model simulation results,indicating that the channel landslide hydrodynamic model is theoretically reasonable and the modeling method is correct.The model can be used for further research of channel landslide.