Simulation Study On Microclimate Effect Of Henan Agricultural University Campus Green Space Layout

Rapid urbanization greatly changed the urban canopy layer?UCL?and the Roughness of urban underlying surface,affects the city microclimate of local green space.College campus is the main place for college teachers and students to work and study,the stand or fall of campus green space microclimate affects the experience of college teachers and students.How to make the limited campus green space for the maximum ecological effect,improve and optimize the campus green space microclimate effect is becoming a hot spot of many scholars attention.This study choose the typical college campus,campus of Henan agricultural university as the research object,with the related theories and concepts of urban climatology,the urban microclimate,green space and ENVI-met microclimate numerical simulation software as the main reference basis,to research the effect of different green space layout in Henan agricultural university's microclimate.Research mainly divided into three parts:?1?the comb of relevant theories and concepts;?2?the microclimate of the campus green space field measurement experiment,and verify the feasibility of the numerical simulation software ENVI-met micro climate and accuracy performance;?3?Under the premise of consistent boundary conditions,to modify the parameters of the green space in the ENVI-met microclimate numerical simulation software,finding out the different of microclimate effect in different green space layout which is simulated.This paper analyzes the relationship between the different green space layout and the microclimate effect of the campus,in order to get the optimization strategy of the different campus green space layoutFor the campus green space layout of the micro climate effect field measurement,the ENVI-met microclimate numerical simulation software validation and simulation of campus green space layout of the micro climate effect.The main work and researchconclusions are as follows:?1?Practical research aspect: the measured research meteorological station forecast is for sunny weather condition,no form of architectural layout in change measurement sample has a notable amendment effect on wind speed,wind direction;Plant community configuration form for the measured sample temperature,humidity and radiation levels have a significant effect;Wind speed of the open space layout is 0.31 m·s-1 larger than the Semi-closure green space layout;The maximum wind speed is 1.41 m·s-1 appeared in the linear green space layout,the minimum is 0m·s-1 appeared in Semi-closure green space layout;Semi-closure green space layout can reduce the temperature by 1.41 ?,increase relative humidity 4.08% RH,reduce the radiation119.25 W·m^-2,which have an obvious effect on the improvement of the microclimate.?2?ENVI-met microclimate numerical simulation software validation aspects:adopting?Root Mean Square Error,RMSE?Square Root Error and Mean Absolute Percentage Error?Mean Absolute Percentage Error,MAPE?numerical simulation software of the precision evaluation index model.The indicators of RMSE respectively goes that,wind speed 0.19 m·s-1,the air temperature 0.64 ?,the relative humidity 2.03% RH,thermal index 11.35 W·m^-2;The indicators of MAPE respectively goes that,wind speed 18.3%,the air temperature 3.4%,the relative humidity,thermal index 6.2%.Integrated the verification results of the indicators,can draw that ENVI-met microclimate numerical simulation in the campus green space layout is feasible operation,the result of campus green space microclimate simulation is reliable.?3?Microclimate effect of different campus green space layout in ENVI-met numerical simulation aspect:Comprehensive comparison of the results of the numerical simulation of microclimate effects in different green spaces,compared with the space layout form without green plants,all the trees green space layout of the optimal wind environment,wind speed increased 0.98 m·s-1,can effective reduce temperature 3.8 ?,increase relative humidity 21.68% RH,reduce the thermal radiation 19.67 W·m^-2;Compared with the space layout form without green plants,allshrub green space layout can reduce wind speed 0.06 m·s-1,reduce temperature1.3 ?,increase relative humidity 26.26% RH,reduce the thermal radiation 15.41W·m^-2;Likewise,compared with the space layout form without green plants,all grass green space layout can increase the wind speed 0.45 m·s-1,reduce temperature 0.8 ?,increase relative humidity 5.51%,reduce the thermal radiation8.85 W·m^-2.