城市规划相关知识精讲班第3讲讲义（Urban planning related knowledge, lectures, lectures, lectures, third）.doc

城市规划相关知识精讲班第3讲讲义（Urban planning related knowledge, lectures, lectures, lectures, third） City planning related knowledge class third lecture notes The natural environmental conditions - weather Two, the construction site design requirements (a) familiar with the natural environment conditions 1. meteorological conditions (1): the intensity of solar radiation and sunshine on the differences in different latitudes, will affect the building of sunshine standard, spacing, orientation, the sunshine distance directly affect the building density, capacity rate and land index etc.. (2) the wind like: impact on the site, with the wind direction and wind speed and the pollution coefficient of three parameters. The wind is blowing from the periphery to the center of the direction, usually with the wind rose represents a region of wind; wind speed determines the size of wind, usually expressed by mean wind rose diagram; from the level of the character, the degree of pollution and the downwind direction of the wind direction frequency is proportional to the wind speed is inversely proportional to size. (3): refers to the temperature is higher than the ground height of 1.5m measured air temperature. The candidates should master data: perennial absolute highest temperature and absolute minimum temperature over the years, the hottest, the coldest month of the monthly mean temperature data. (4) precipitation: refers to the falling rain and snow, hail and other water on the ground, without evaporation and infiltration loss, accumulate in the horizontal plane thickness, unit: mm. The candidates should master data: average annual rainfall, rainfall duration and maximum rainfall. At the beginning of the end date of the maximum thickness of the snow, snow, frozen soil maximum depth data. The natural environmental conditions - topography 2. topography (1) types: macro is divided into three types of mountain hills and plain. Is further divided into valleys, slopes, hills and gullies, basin,