黄土高原地区降水的空间分布

采用8种空间捕值方法对黄土高原地区降水量的空间分布进行模拟.经验证发现:年均降水量用全局多项式插值方法最佳,7月的降水量和6-9月降水量占年降水量的百分比则用局部多项式插值方法最好.由空间插值结果得出:黄土高原地区年均降水量的区域分布不均匀,由东南部的700 mm左右向两北逐渐减少至120 mm左右,多年降水量等值线呈东北-西南走向;6-9月降水量占年降水量的百分比基本上由南向北逐渐增大;7月的降水最也南东南向两北逐渐减少,由东南部的150 mm左右向西北逐渐减少至不到40 mm.

Spatial distribution of precipitation in the Loess Plateau region

The spatial distribution of precipitation in the Loess Plateau region was evaluated with eight statistical modeling methods. Through validation, it was found that the global polynomial interpolation was the optimal method to simulate the spatial distribution of mean annual precipitation and the local polynomial interpolation method was the best one to simulate the spatial distributions of precipitation in July and the ratio of precipitation in 6-9 months to annual precipitation. It could be concluded from the approach that the distribution of annual precipitation in the study region is not uniform and the trend shows a decrease of precipitation from the southeast to the northwest (from 700 mm to 120 mm). Generally speaking, the ratio of precipitation in 6-9 months to annual precipitation increases gradually from the south to the north; the precipitation in July decreases from the southeast (150 mm) to the northwest (40 mm).