复杂地形下风场插值与林火蔓延模拟应用研究

山区地形复杂多变,风场随地形而变化,作为影响林火蔓延的主要因素,风场数据的准确程度将直接影响山地林火蔓延预测的结果。选择同时考虑地形起伏变化和距离作为主要因子的风场插值方法,设计并开发实现风场插值功能,并与基于空间距离的传统反距离权重(IDW)插值方法进行了比较研究。通过实验验证表明,所实现的基于地形起伏的风场插值方法对山区风场的模拟更接近实际;利用该方法的插值结果输入林火蔓延模拟,模拟的火场形状与实际范围具有更高的相似度。

Wind field interpolation over complex terrain and its application in the simulation of forest fire spreading

Speed and direction of wind change over complex terrain in mountain areas. As a major factor affecting the spread of forest fires, the accuracy of wind field data directly affects the prediction of forest fire spreading in mountain areas. We developed a new method of interpolation of the wind field which takes both topographic relief and distance as weighting factors into consideration. Compared with the traditional IDW interpolation method based on spatial distance, our verified results show that the wind field interpolated by this new method is closer to actual conditions and the simulation of forest fire spreading with the interpolated wind field data is more similar both in fire shape and burned area.