Research On The Connection Of Urban Water Conservancy Drainage And Municipal Drainage Based On MIKE Model

The state has paid more and more attention to the problem of urban water logging,and with the increase of the waterlogging,the state has issued a series of laws and regulations to solve the problem of urban water logging.However,there are no clear laws and regulations to guide the problems,and further research is needed.Such as the problem of the connection between the urban water drainage and the municipal drainage.Based on the analysis of the connotation and characteristics of the municipal drainage and water drainage system,the internal relations and the connection nature of the two-stage system are determined based on the analysis of the connotation and characteristics of the municipal drainage and water drainage system.The two-stage system is carried out in terms of the connection relation between the two-stage system of the two-stage system of the municipal drainage and the water-drainage and the water-drainage and the water-level connecting relation of the water.The main findings of the bridging study are as follows:(1)To determine the nature and research contents of the connection between municipal drainage and water drainage systems.This paper studies the connotation of the two-level system respectively,analyzes the relationship and the nature of the connection between the drainage system and the municipal drainage system,and determines that the essence of the connection between the drainage system and the municipal drainage system is the connection between the relationship of the recurrence period and the water level of the drainage outlet.(2)Establishment of MIKE model in the study area.This paper introduces the steps of establishing the MIKEURBAN model,analyzes the underlying surface of the study area by ArcGIS,and determines and verifies the model rate.the drainage capacity in the study area was simulated by several rainfall conditions of la,2a,3a,5a.the evaluation map of drainage pipe capacity in the study area was obtained.(3)Determination of the connection relationship between the two-stage systems.The municipal drainage system and the water drainage system are compared and linked from the design storm peak and runoff peak respectively.The results show that the municipal drainage system has a recurrence period of 3 years,5 years,5 years,5 years,5 years and 10 years respectively.By comparing the peak runoff of the two-stage system,it is concluded that when the catchment area is less than 10km2,the municipal drainage system has a recurrence period of 1 year,2 years,3 years and 5 years respectively When the catchment area is larger than 10 km2,the municipal drainage system shall have a recurrence period of 3 to 5 years,5 years,5 to 5 years and 10 years respectively.(4)By comparing the design of the connection of the peak recurrence period of rainstorm and runoff between municipal drainage and water drainage system,it is found that the difference of confluence time is the main reason of the connection relationship between the two stages of system recurrence period,and the connection method of the design of the peak rainstorm is only suitable for use when the catchment area is large,otherwise the connection relationship will lead to the smaller recurrence period of water drainage.(5)Determination of the connection relationship between the water level of the two-stage system.Based on the analysis of the overflow and overloading of municipal drainage pipe joints under different recurrence periods and different river water levels,it is concluded that when the submergence depth of the river water level is less than 1m,the effect of the top support on the drainage capacity of the municipal drainage system is relatively small,it is suggested that the maximum controlled water level of the river should not be higher than that of the municipal drainage pipe outlet 1m.