摘要
利用古尔班通古特沙漠地区以及周围20个气象站45年（1961年～2005年）历史资料，结合古尔班通古特沙漠3个野外风沙监测站近5年（2001年～2005年）的5层梯度风（0．5m、2．0m、4．0m、6．0m、10．0m）野外监测资料，对古尔班通古特沙漠瞬间最大风速时空分布与活化沙丘治理对策进行分析。在此基础上，选取活化沙丘顶部为床面，分析了古尔班通古特沙漠活化沙丘顶部边界层内10分钟平均最大风速与瞬问最大风速空间相关性，发现风沙边界层内任意两层的瞬间最大风速相关显著，相关系数在0．9654—0．9922之间，且随高度增加相关系数呈现增加，而影响这一变化特征的主要因素是下垫面状况。本文通过大量分析，建立了活化沙丘顶部风沙边界层内1分钟平均风速的预测模式，其公式为u=（Z／Z1）^0.1026，为今后古尔班通古特沙漠活化沙丘的治理提供科学依据。
A study on spatial-temporal distribution of maximum instantaneous wind velocity and the control of active dunes in the Gurbantunggnt Desert was made by analyzing historical data during the periods of 1961 ～ 2005 from 20 observatories in Gurbantunggnt Desert and nearby areas and the 5 - layer （0.5m, 2.0m, 4.0m, 6.0m, 10.0m） gradient wind data from 3 field wind-sand monitoring stations （2001 ～ 2005）. We also analyzed the spatial correlation between average maximum wind velocity and maximum instantaneous wind velocity in 10 minutes of top boundary layer of active dune in Gurbantunggnt Desert. The results show a significant correlation between maximum instantaneous wind velocity and two arbitrary layers in blown-sand boundary layer. The correlation coefficients all passed the test of significance with a equals to 0.001, ranging from 0.9654 to 0.9922, and errors ranging within 3.5 percent and 10.2 percent. The correlation coefficient is increasing with the raise of layer height, while the relative errors decreasing. This is caused by the different conditions of terrain and underlaying surface. The results of field blown-sand analysis show that the average wind velocity in 1 minute present a power exponent distribution with the change of height, u = （Z/Z1）0. 1026. The differential values between modeling results and field measurements range from 0.0 to 0.7m/s, and relative errors are 0.0% ～ 8.9per cent. The maximum error, which appears under the height of 2.0m, shows that the theoretical model of profile of top half of the active dune at different heights in Gurbantunggnt Desert is relative precise. The results of the research provide theoretical basis for the further controlling active dunes in Gurbantunggut Desert.
出处
《资源科学》
CSSCI
CSCD
北大核心
2007年第4期46-53,共8页
Resources Science
基金
西部交通建设科技项目(编号:200131879702)
关键词
活化沙丘治理
风沙边界层
瞬时最大风速
时空分布特征
Active dune control
Gurbantunggnt desert
Maximum instantaneous Wind speed
Spatial- temporal distribution
