积风的定义、类型和算法

The Definition and Classification of Accumulated Wind and It’s Calculation

风是沙地、沙漠地形地貌及其植被形成与演化的基本动力条件。文章提出了积风的概念,即某一地区一段时间内风速与风作用持续时间乘积的总和(作用于某一位置上某一时段内风矢量的积分),用来评价区域风沙活动累积效应。依据临界起沙风风速,将积风划分成总积风和有效积风;依据风况方向分布特征,将积风划分为全方向积风和方向积风,丰富了风力作用的过程信息。通过积风与输沙势的对比分析发现,在评价区域风况特征时使用观测资料不同,积风的稳定性较高,可以作为目前风沙地貌研究中的主要指标。

Wind is the basic dynamic condition for the formation and evolution of sandy land,desert topography and vegetation..Wind is the basic dynamic condition for the formation and evolution of sand cover.This paper puts forward the concept of accumulated wind,which is the sum of the product of wind speed and duration of wind action in a certain area for a period of time,to evaluate the intensity of regional wind and sand activities.According to the critical wind speed,the accumulated wind is divided into total accumulated wind and effective accumulated wind.According to the direction distribution characteristics of wind conditions,the accumulated wind is divided into omnidirectional accumulated wind and directional accumulated wind,which enriches the process information of wind action.Through the comparative analysis of accumulated wind and drift potential,it is found that different observation data are used to evaluate the characteristics of regional wind conditions,and the stability of accumulated wind is relatively high,which can be used as the main index in the study of wind-sand geomorphology at present.