Evaluation of drainage network and multi-scale zoning optimization strategy in a built up area
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Abstract:
In order to evaluate the situation of drainage network in a built-up area and propose a targeted multi-scale zoning optimization strategy for improving drainage capacity of pipelines,this paper constructed an urban integrated drainage model with InfoWorks ICM for the Dongcheng District of Beijng.The model was calibrated and validated with two measured rainfall event data.The results showed that the model had a high accuracy and was reliable.The model was then used to simulate the drainage capacity of the drainage network under four different rainfall scenarios of the recurrence periods of 1,3,5 and 10 years.The simulation results of the study area were analyzed in three scales:1.The proportions of pipeline lengths of urban scale pipeline networks with less than 1 year,1-3 years,3-5 years,5-10 years and 10 years were 52%,10%,4%,6% and 29% respectively;2.The drainage capacity of the functional zoning on the land was:park and green space≥residential area>commercial and administrative office area>business area;3.The proportions of pipeline length of main and secondary roads with less than 1 year,1-3 years,3-5 years,5-10 years and 10 years were 38%,9%,4%,7% and 42%,respectively.Based on the evaluation results of drainage capacity of drainage pipe network under different scales,the problems and causes of insufficient drainage capacity were diagnosed and analyzed,and a suitability optimization strategy for improving drainage capacity was expected for other old urban areas in China through systematic assessment and optimization of the pipeline network.
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