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Characteristics of the Sand Flow Structure of Artificially governed Sand Dune on the East Shore of Qinghai

青海湖湖东人工治理沙丘风沙流结构特征


采用SPSS软件定量分析青海湖湖东沙地人工治理沙丘风沙流结构中总输沙率与风速、不同高度处的输沙率与风速及不同风速下的输沙率与高度的关系,并比较人工治理沙丘和流动沙丘在风速相同和输沙率相近时的风沙流结构。结果表明: 人工治理沙丘上总输沙率随风速的增大而增加,当风速大于11 m·s-1时,增加显著;0~2 cm高度层输沙率随风速增大变化规律不明显,有一定的偶然性及随机性,2~60 cm的29个高度层输沙率随风速增大而变大,但是简单的曲线拟合无法反映其变化规律; 2种沙丘输沙率随高度的变化均呈指数规律递减,当风速相等时人工治理沙丘的输沙率较小,当输沙率相近时人工治理沙丘的风速大于流动沙丘且风沙流结构同流动沙丘有明显不同。

In this we studied relationships between the total sand transport rate and wind speed, between the transport rates at different heights and wind speed, and between sand transport rate under different wind speeds with the height in the sand flow structure of artificially managed sand dune and mobile dune on the East shore of Qinghai Lake based on field measurement and SPSS data analysis. We also compared sand flow structures of the artificially governed dunes and mobile dunes at the same wind speed and the similar sand transport rate. The results showed that artificial measures had effects on sand flow structure. Total sand transport rate went up as wind velocity increased on artificially managed sand dune. When wind velocity was greater than 11 m·s-1, total sand transport rate increased obviously. The variation of sand transport rate at 0~2 cm height was not obviously related to wind velocity. However, at 2~60 cm height, sand transport rate increased with wind velocity, but simple curve simulation did not fit the change pattern. The transport rate of the both sand dunes decreased exponentially with height. at the same wind velocity, the transport rate in artificially governed sand dune was lower than that in mobile dune. When sand transport rate was similar, the wind on mobile dune was stronger than that on artificially governed sand dune, and there was obvious difference in the sand flow structures between the two dunes.


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