不同下垫面沙通量估算—以策勒绿洲—沙漠过渡带为例

Abstract

Abstract: Sand flux is a parameter which measure wind capacity to move sand,and the difference of terrain and vegetation coverage lead to the difference of the erosion of sand bed and sand-blown activity. With measuring data of wind velocity and sand flux in the field of Cele oasis-desert ecotone,Xinjiang,China,the responding parameters for the model corrected by Bagnold were obtained,which would offer a way to estimate the weight of sand flux. The results of the study have showed as follows:firstly,aerodynamics roughness was affected by the underlying surface and wind velocity,plant coverage increased the roughness and the wind velocity played opposite effect,the roughness values in the mobile sandland,semi-mobile sandland,and fixed sandland were 0.03 cm, 0.10 cm and 22 cm respectively. Secondly,the responding B value in mobile sandland was 4.33×10^-11,semi-mobile sandland model was 6.27×10^-11,and fixed sandland model was 2.61×10^-9. These models had excellent relevance with the measured value,which can be explained that the calculated value of sand flux in mobile sandland was 0.93 times to the measured value,and the semi-mobile sandland was 1.07 times,and the coefficient value in mobile sandland and semi-mobile sandland was 0.88 and 0.99 respectively,and the model with the high tested value was applicable in this underlying surface. Thirdly,taking advantage of these models to estimate sand transportation weight from March to September,2014,the calculation results of model indicated that mobile sandland transportation was about 5 679.4 kg·m^-1 in Cele oasis-desert ecotone,semi-mobile sandland transportation was 1 033 kg·m^-1,accounting for 18.2% of the mobile sandland,and fixed sandland transportation was 176.2 kg·m^-1, accounting for 3% of mobile sandland. These data indicated that the existed plants played a vital role in preventing wind velocity and wind-blown disasters. This paper combined the measurement value in the field with the classical aerodynamics model created by Bagnold. As the parameters of the model changed with different underlying, the sand flux was calculated and sand disasters of different plant coverage area were predicated with the models in Cele oasis-desert ecotone. As a whole,the research method is scientific and study results are credible.

Key words: sand flux, aerodynamic roughness, sand particles, different underlying surface

CLC Number:

P931.3

WANG Cui, LI Sheng-yu, LEI Jia-qiang, LI Zhi-nong, CHEN Jie, ZHOU Jie. Sand flux estimation of different underlying surface, a case of Cele oasis-desert ecotone[J]., 2017, 40(3): 533-540.

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Sand flux estimation of different underlying surface, a case of Cele oasis-desert ecotone

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