The Grid Simulation Of Heat Resources In Complex Geographical Environment

Heat resources are one of the important basic resources in agricultural production.Under the background of global warming,the spatial distribution of heat resources has changed greatly.Therefore,it is of great significance to calculate the heat resources of fine grid and find its distribution law.In the case that the field investigation data is difficult to obtain,with the help of GIS platform,using the measured temperature data of 75 meteorological stations in Fujian Province and its surrounding areas from 1960 to 2015 and DEM data with spatial resolution of 100 m,a statistical model for heat resources related physical experience in complex geographical environment based on ten-day average temperature is established,and the grid simulation of heat resources at 100 m × 100 m resolution in Fujian Province is realized.The main results are follows:(1)The critical temperature of the boundary temperature is determined to improve the stability of the model;at the same time,based on the relationship between the ten-day average temperature and the beginning and ending dates of the boundary temperature,and based on the grid simulation results of the ten-day average temperature,the grid model of heat resources is established,which has clear physical meaning and good simulation effect.(2)The grid simulation of heat resources with spatial resolution of 100 m in Fujian Province is realized,and the spatial distribution maps in complex geographical environment in Fujian Province are drawn,including the beginning and ending dates,duration days of ? 10 ?,? 15 ?,? 20 ? and corresponding active accumulated temperature and effective accumulated temperature,which better reflects the distribution low of heat resources in complex geographical environment in Fujian Province.Except for the first day of 15 ? and 20 ? boundary temperature,other elements of heat resources have certain zonal distribution characteristics.The analysis results of local distribution laws show that the distribution law of heat resources affected by local terrain factors such as slope and aspect can be well expressed,and the lower the boundary temperature,the more obvious the influence of local topographic factors.(3)The results of error analysis show that the grid model of heat resources based on tenday average temperature has high simulation accuracy.The grid MABE of beginning and ending dates of boundary temperature is between 2.6-5.0 d,and the grid MABE of active accumulated temperature and effective accumulated temperature are less than 150 ?·D.Through cross-validation and case-year verification,it shows that the grid model of the beginning and ending dates,and accumulated temperature of the boundary temperature at all levels has good spatial dimension stability and time dimension extrapolation.