Polygon Synthesis Index Method On City Greenways Thermal Comfort Evaluation Of The Feasibility Study

The stand or fall of outdoor environment is very important. Urban development is rapid, but environmental problems with all people, the people to the pursuit of good environment more intense.The development of the city to the direction of more ecological development, so many in the city were build green way, green way in the city of appear not only improved the ecological environment, also give people more good activities environment. But a lot of the green way and can’t achieve the desired effect, so this study from set out actually, through the field to collect data, using the polygon of the tao to the green index method, thermal comfort analysis, this paper summarizes the thermal comfort of green way actual and found the insufficient place.First of all this from the field measurement data and questionnaire, by starting within the tao to the green different types of plot data including:temperature, humidity, wind speed for the collection, then summary statistics, respectively for the polygon synthesis index method, THI temperature and humidity index method and SD semantic difference method for the thermal comfort and analysis results are compared.To the polygon synthesis index method in outdoor hot comfort evaluation analysis of the feasibility and superiority, and conclude the test area of the shortcomings of the word green construction, so as to enhance the thermal comfort. In the Guishui greenways to study the assessment of thermal comfort preliminary got the following conclusions:(1) cach test zone temperature is the same trend, the temperature at12:00～14:00to reach the highest, Open space and grassland the temperature is higher than the woodland, the cooling effect is best under forest glade.(2) in humidity testing in each test area of humidity change trend is the same,12:00～14:00to its lowest point in the day, and then gradually increased, the relative humidity of the woodland than the other two regions of high humidity, but from the trend, the18: OOafter the grass and space relative humidity should be over woodland.(3) from the speed of the test results get:see that according to the wind speed rating system, in the three days of the basic are in1～2levels of wind power, wind speed in0.8～1.9m/s. The three days of wind speed are basically the same trend. The minimum wind speed appears every day in the morning around8:00, then gradually wind speed increase. In three days of tests, the space of the wind speed slightly larger than the forest land.(4) through the polygon index method of calculation formula can see three trials area is the same as the change trend, it is from8:00a.m. to start having a downward trend of lower, and then began around12:00rise. The size of the polygon synthesis index, the order to:space<grass<forest land. Visible in improving comfort woodland plays a certain role. Through the SD semantic differences of the questionnaire survey method to get on a subjective test area the thermal comfort of all feel very uncomfortable, are expected to be able to cool the, the shade of hot feeling a little better than to meadows and square. Through the SD semantic differences of the questionnaire survey method to get on a subjective test area the thermal comfort of all feel very uncomfortable, are expected to be able to cool the, the shade of hot feeling a little better than to meadows and square. use THI temperature and humidity index method, the result of the test to get:the area is in a very basic level of heat and heat; The three test area THI value, the order to size: space>grass>forest land,forest land is a relatively comfortable area.(5) A combination of the thermal comfort of evaluation method, and the results show that:the polygon index analysis evaluation results and other basic of the two methods of evaluation results are consistent, and evaluation result is more accurate, but two other than methods according to the superiority.(6) with a tall trees of the forest cover open area best comfort, the lowest temperature, humidity is greatest; No trees cover but below the upper grass overlay the grass of the area, and the comfort center, temperature, humidity center; Are all hard pavement open comfort is the worst. The order to comfort:space<grass<forest land.