Analysis of the impervious land surface pattern distribution and its hydrological effects in the main urban area of Jinan
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Abstract:
The impervious surface distribution is explored through field investigation, remote sensing interpretation and marking in the main ur ban area of Jinan. The study is revealed that the greening rate in the main urban area of Jinan reached 33.9% , and the proportion of the impervious area is 65.3% , respectively. The HIMS2SWMM model is used to simulate the hourly scale run-off, and the variation of t he runoff coefficient under the impervious surface distribution of each administrative district in the main urban area of Jinan City . Taking the rainfall from July to August 2016 as input, the whole study area has total precipitation of 125.23 mm, the infiltr ation amount is 36.33 mm, and the generated runoff is 88.9 mm, respectively . The overall runoff coefficient of the main urban area of Jinan is 0.71. The proportion of the impervious surface of each land type has a strong linearrelationship with the runoff coefficient, and the change is divided into threshold type and gradual type. For the threshold type of land use, more concentrated greening measures or LID measures can be carried out. For the gradual type of land use, slow gradual greening or LID measures can be adopted, which can improve the proportion of impervious water surface of the threshold type of land use in a cent ralized way , supplemented by a smaller range of improvement measures, aiming to achieve more economical and effective prevention of city floods.
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