The Study Of Simulation And Application Of Rainwater And Flood Based On MIKE FLOOD Model In Ji’nan City

Ji’nan is the capital of Shandong Province. It is also an important social,economic and cultural center of Shandong Province. Known as the spring city, Jinanhas a long water culture. In recent years, as the city continues to expand, increasingpopulation, environmental degradation, water resources become tighter, meanwhile,the frequency of urban rain storm disasters is increasing, destructive growing. JinanCity was designated as one of the key cities of twenty-five Flood in1987. In1840-1948, there were floods16times,41years after the founding, the co-occurrenceof floods27times, In1942,1960,1963,1964,1987,2007, were the hardest hit,the pressure of flood control is larger.Research on rainwater flooded areas beneficial research rainwater disasters, tostudy rainwater disaster prevention and management, have to study rainwater floodedregion. For the study of urban flooding rain, the most rational scientific method is themodel simulation, simulated by the model generation process can reproduce thehistorical floods, Prevent future disasters that may occur, proposed mitigationstrategies related to the simulation results. In this study, after comparing many modelsof urban flooding rain, we selected the MIKE models which base on hydrodynamicequations and using one-dimensional model and two-dimensional model to simulatethe main city rain floods. According to the simulation results, divide the area ofdisaster risk and Plant a regional flood control work.In this study, the first chapter introduces the background and significance of theresearch progress of urban rain floods topic. The second chapter provides an overviewof the study area, including natural and geographical conditions and socio-economicstatus. Based on the hydrological, meteorological data and Terrain, in the third chapter,the extraction of the river network of the study area, dividing the valley, find out itshydrological, topographical features. The fourth chapter briefly describes the institute selected models. In the fifth chapter, the rainfall runoff model and non continuousone-dimensional model is established, the runoff producing rainfall in the region issimulated, and simulate the hydrological conditions of river. After the establishmentof a regional three-dimensional terrain, simulated the two-dimensional overland flowrunoff process and coupled with the one-dimensional model, realistic simulation ofthe flooded area in the larger state rainfall conditions faced. combined with theregional population, economic status, make the risk map rain flood disaster area, canbe more intuitive to show in the city somewhere in the level of risk of the flooddisaster. In the sixth chapter, combined with the regional population, economic status,make the risk map rain flood disaster area, can be more intuitive to show in the citysomewhere in the level of risk of the flood disaster. Combined with the allocation ofrisk, based on landscape theory, proposed the governance and planning strategies inthe seventh chapter..The main conclusions of this study are as follows:（1）Using the MIKE11RR model of rainfall runoff conditions were simulatedwithin the region, Better reproduction of the one-dimensional runoff condition. Thestudy area is divided into a basin, simulated the traffic area, the water level, andcompared the simulation of hydrological data and Huang Taiwan hydrological stationsmeasured data, the simulation results more reasonable. After calibration，the modelcan be used for surface water in the basin, shallow groundwater resources calculation,as the same time the model is effective tool in the area of river and the city’s roadsflood forecasts.（2）Using MIKE11HD model to simulate the one-dimensional river carried.Presents a more intuitive and reliable river hydrology of the region. By MIKE11HDmodel coupled with NAM, simulated the hydrology of the regional, Calculate the areaat0:00on January1st,2008to December31,201224river hydrology. The simulationresults of the hydrological situation better recovery area within this period of time theriver. Able to use the model for the future when the hydrology of the river undercertain rainfall intensity line simulation. （3）Using rainfall data of2008.7.18, establishment time-series documents andsimulated the overflow of the two-dimensional area. Survey rainstorm disastersimulation results with the Jinan Municipal Bureau of Hydrology HydrologicalYearbook provided for comparison, Consistent with the findings of the Yearbook.（4）Through the two-dimensional model coupled with the one-dimensionalmodel, simulated flood and flood situation in the region after rain. By contrast withthe historical measured data, found that more than a simple two-dimensionalsimulations closer to real situation. Combined with the economic situation of theregion flooded and many other factors, it is to better reflect the extent of the damage.Submerged by simulated rainfall, to a certain extent, to show the extent of floodingcaused by the rainfall, but not the full extent the damage which to express disasters.By analyzing the different rainfall intensity rains flood disaster risk, flood riskidentified. In accordance with the classification of risk warning, the rain flood riskarea is divided into four levels, to provide a reliable basis for disaster relief. Throughthe analysis of risk maps found that the north of Jingshi Road and south of theXiaoqing River has a high level of risk after the rainfall intensity reached disasterlevels. Some areas the level of risk significantly increased with increasing rainfallintensity. In case of heavy rain, it has the highest level.（6）By rainwater risk identification, clarifying the causes of storm floods.According terrain, urban construction and rainfall runoff situation，it is divided intothree areas of governance plan. It is proposed to protect the ecological-basedplanning and governance programs, on the southern landscape ecology and WaterConservation District. These policies include included the small watershedmanagement, the development of eco-tourism and agriculture policies. In the centralregion, to protect springs theme governance ecological water landscape. Train TheRiver into the landscape. Make the Lakes into the park. Turn the rainwater into waterresources. Make the urban to be a hydrophilic city, restore Jinan’s spring’sreputation. Proposed the construction of artificial lakes recommend building in thesouthern region of the Yellow River. Set an artificial water bodies in a limited area,could achieve the purpose of beautifying the city, regulates the city’s flood and achieve the double effect of mitigation and water use.The main innovations of this study are as follows:（1）Use of regional digital elevation data, analyzed the hydrologic, makes theriver distribution perfect within the region. Based on the digital elevation data,analyzed the Hydrological of this regions can able to sort out the river. Correction ofthe artificial modification of the river, get real and reliable river, at the same time,divided the watershed area for this area. Provide the basis for flood control planningand water conservancy construction.（2）Constructed rainwater database of the main city of Jinan. This papersystematically constructed storm water database main city of Jinan, Including spatialand attribute database. The Spatial databases are mainly including DEM data, vectorof buildings and roads layer. Put them superimposed with terrain data row. Get a moreaccurate terrain data area. Using GIS tools to obtain an administrative zoning mapwithin the region, meteorological and hydrological site map, river generalized maps.Establish the regional storm water attribute database, Including meteorological data,hydrological data, river cross-section data and evaporation data. Calibration of thecorrelation coefficient, including runoff coefficient, surface aquifer maximummoisture, maximum moisture content of the soil layer, overland flow coefficient,Courant number, eddy viscosity coefficient, Manning coefficient. Provide a basis forrain disaster research.（3）Establish rainwater model and analyze the rainwater risk area. From twodimensions, using three models simulate regional storm water modeling. Usingone-dimensional and two-dimensional model coupling rainfall floods in the regionwere simulated and the rates are fixed, and establish a model for regional storm waterstudy. Rainwater disaster forecast for the region and relief provides a quantitativesupport. Input different rainfall intensities data, simulated the case of flooding andflood development. Combined with socio-economic data, the risk level is dividedregions; provide the basis for disaster prevention and relief decisions.