Study On Hydrologic Cycle Changes In Urbanization Of Jinan City

Urbnization causes all types of water problems in China. Take Jinan as an example, ground properties changes and urbanization direction are detailed, Urbanization changes the hydrologic cycle furthaer and brings the problems such as urban storm floods, water resources crisis, water pollution and groundwater exhaustion. Relevant literatures and hydrological data in Jinan are analysed to proof the facts that the essential factor in hydrologic cycle like Rainfall, evaporation and rainfall runoff have been changed in urbanization process. This lead to The probability of urban storm floods grows.The terrain features of Jinan is that the southern part is higher than the northern, the climate features is that rainfall concentrated mostly in summer, and heavy rain often appear. Such features contribute to urban storm floods. In such a condition, the city flood control system has failed to meet the urban flood needs.The catchment of Xiao Qing-he River in downtown is taken as the research area. With the MIKE 11 simulation software that developed by the Danish Hydraulic Institute, a hydrologic model is setting up using the NAM model, and the river networks hydrodynamic model based on the features of Jinan is established. Numerical simulation of flow in Jinan is presented in terms of NAM model and HD model. Floods in 1962 and 2007 are simulated. The difference of hydrology characteristics between the rural area and urbanization areas are described. Consider that urbanization causes the conflux time decreases and the surface runoff increase.Aims at the serious condition of flood controlling in Jinan, Solutions such as changing philosophy of flood controlling and recovering the ground properties are discussed and deemed to solve the problem of hydrologic cycle changes.