城市雨水管網(wǎng)模型參數(shù)優(yōu)化及應(yīng)用研究
[Abstract]:Under the background of frequent waterlogging disasters and the construction of sponge cities, urban rainwater flood model has gradually become an effective means of rainwater management, aiming at solving the problem of spatial distribution of rainwater, the essence of urban rainwater drainage. In recent years, more and more attention has been paid to parameter optimization and calibration as the key problem of its accuracy and reliability. Based on SWMM model of one-dimensional simulation kernel and parameter identification optimization thought of many urban rainwater network model software, the automatic optimization of hydrological and hydraulic module parameters has been studied in this paper. Based on SWMM model, the mathematical model of urban rainwater pipe network and its simulation principle are introduced in detail. On the basis of systematically studying the range of hydrological and hydraulic parameters of SWMM model, taking a rainwater pipe network in C city as an example, the modified Morris screening method is used to analyze the local sensitivity of 14 parameters, and each parameter is obtained. The sensitivity distribution and stability analysis results of parameters for different target variables (total runoff, peak flow, hydraulic load at discharge outlet) are given. The area of sub-drainage area and the impermeability correction coefficient are introduced to determine 10 optimal parameter sets. The adaptive chaotic particle swarm optimization algorithm (ACPSO) is studied. Nonlinearity by exponential function is introduced. Three classical Benchmark problems are used to test the performance of the standard particle swarm optimization (SPSO). The results show that the algorithm can effectively get rid of premature convergence, and its convergence and stability are enhanced. It can be used in parameter optimization research. The optimization of SWMM parameters is studied. A total of 10 external API functions are developed in C language for this study. The mathematical model of SWMM parameters optimization is constructed by matching water level and flow rate and solved by ACPSO algorithm. The results show that Nash effect of two objective variables is used to optimize and validate the field rainfall. The ratio coefficient (NSE) is above 0.70, and the absolute relative error of peak discharge is less than 10%. The results of waterlogging and overflow validation are basically consistent with the actual situation. The accuracy and reliability of SWMM model optimized by parameters are satisfactory. As an application of urban rainwater pipe network model, the performance evaluation of C-type pipe network in a certain area is carried out based on the above results. It is estimated that the overall standard-reaching rate of the rainwater pipe network is 57.69% (meeting the design recurrence period P(28)2a and above), but the relative overall system tolerance is 98.73%. This shows the necessity and feasibility of developing and constructing sponge cities in this area.
【學(xué)位授予單位】:哈爾濱工業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TU992
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