摘要
通过对平坦沙质地表蚀积动态的野外观测,结合同时期区域风况资料,分析了平坦沙质地表蚀积过程。在输沙势和最大可能输沙量计算公式基础上,调整参数提出了平坦沙质地表蚀积量的计算模型,弥补了两者不能直观准确表示区域风沙活动的缺点。通过对比野外实测值与输沙势、模型预测值和最大可能输沙量之间的变化趋势得出它们存在同期波动特征。进一步比较回归方程可知,模型预测值回归方程更加显著,预测值更加接近实测值,能够更好地表示区域风沙活动特征和强度,可为沙漠的扩张和收缩提供量化预测依据。
The dynamic processes of aeolian erosion and deposition on flat sandy surface were analyzed based on field observation and the data of regional wind regime. By calculating the drift potential and the maximum possible quantity of sand transport, a computational model was put forward for predicting the quantity of ae olian erosion and deposition on flat sandy surface, which can make up for the deficiency that both the drift potential and the maximum possible quantity of sand transport can not reveal intuitively the strength of re gional windblown sand activity. Comparison of tendency maps showed that field measured value, predicted value by the computational model and calculated drift potential and maximum possible quantity had the same fluctuation character. Furthermore, comparison of regression equations showed that the regression equation for prediction was significant and predicted value was more close to field measured value. The computational model can better predict the strength of regional windblown sand activity and provides evidence for the ex pansion and shrink of sandy desert.
出处
《水土保持通报》
CSCD
北大核心
2013年第5期210-214,共5页
Bulletin of Soil and Water Conservation
基金
国家自然科学基金项目"沙山湖泊局地环流特征研究"(41071009)
中国科学院"西部之光"项目"鸣沙山移动规律及其对月牙泉影响研究"(29Y128841)
关键词
输沙势
最大可能输沙量
平坦沙质地表
风蚀
drift potential
maximum possible sand transport quantity
flat sandy surface
aeolian erosion
