| In the traditional construction of university campus,there are many problems,such as large hardening area,poor water storage and seepage capacity,low drainage standard and so on.This study takes the West Campus of Hebei Agricultural University as the research object.On the basis of field investigation,the paper analyzes the design of hardened pavement,greening and drainage pipe network system in the campus.Through the establishment of SWMM model,the hydrological status of the campus is accurately analyzed,and the existing problems in the campus are transformed by lid.The main research contents are as follows:(1)Based on the situation of the campus drainage network and the underlying surface type of the campus,combined with the topography and landform,the campus is generalized into 205 sub catchment areas,214 nodes,213 pipe sections and 2 discharge outlets,and the SWMM model of campus rainfall surface runoff drainage network is established.(2)Based on the simulated rainfall of the Chicago rain pattern,the two-hour continuous rainfall data under 5 return periods of 2 years,5 years,10 years,20 years,and 50 years are respectively calculated.The rainfall data of different return periods are input into the established model to get the current situation of waterlogging and drainage in the study area.(3)According to the characteristics of the study area,six different low-impact campus development and improvement plans were preliminary analyzed and compared,and the green roof and permeable paving reform plan was finally selected for simulation calculation,and the rainfall-runoff effect of the reform plan was obtained.(4)The simulation results at the initial stage are compared with those after the transformation.The results show that after the low impact reconstruction,the peak flow,pipe network load,waterlogging and ponding of the campus are significantly improved.This study systematically studies the scheme of campus lid reconstruction,and carries out simulation and evaluation.The research results are of great significance for building a small-scale rainwater system,reducing the risk of waterlogging,and promoting the development of sponge city concept. |
