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Accueil du site → Master → Chine → 2020 → Study on Wind Sand Flow of Different Underlying Surfaces in Arid Open-pit of Northwest China ——A Case Study of Wuhai Open-pit Mining Area

Beijing Forestry University (北京林业大学) 2020

Study on Wind Sand Flow of Different Underlying Surfaces in Arid Open-pit of Northwest China ——A Case Study of Wuhai Open-pit Mining Area

胡平

Titre : Study on Wind Sand Flow of Different Underlying Surfaces in Arid Open-pit of Northwest China ——A Case Study of Wuhai Open-pit Mining Area

Auteur :

Grade : Master’s Theses 2020

Université : Beijing Forestry University (北京林业大学)

Résumé partiel
The fragile ecological environment of arid desert open-pit mining area is an important problem to be solved in production and development.The arid area of Northwest China is one of the main areas with active sandstorm.In addition to the influence of coal mining industry and human disturbance,the destruction of vegetation and material structure accelerates the sandstorm activity,resulting in the further deterioration of fragile ecological environment,Therefore,the dust prevention and control in the mining area is an urgent problem in the ecological restoration.In order to study the law of aeolian sand in the mining area,the sand source area of the underlying surface of the openpit mining area in Wuhai City is selected as the research object,The types of underlying surface in the mining area are divided,The wind speed,wind speed profile,the law of wind sand flow differentiation,the characteristics of dust particle size and the monthly variation of dust horizontal flux were studied.The findings are as follows :(1)The underlying surface of the mining area is divided into 3 types and 10 types.The three type groups are Type group of underlying surface of gravelly soil,type group of sand underlying surface,type group of clay underlying surface.The 10 types of underlying surfaces are block dry underlay,boulder dry underlay,breccia dry underlay,gravel dry underlay,boulder wet underlay,and fine sand vegetation.Underlying surface,underlying surface covered by fine sand vegetation,underlying surface covered by medium sand vegetation,underlying surface covered by humid clay soil,underlying surface covered by wet clay soil,and underlayed by clay ridge vegetation.(2)In the mining area,the roughness of the underlying surface covered by vegetation is larger,and the roughness of the exposed surface is smaller.The relationship between the sand velocity of different underlying surfaces and the roughness is positive correlation ;In the mining area,the average sand dust level of the underlay surface with low coverage of fine sand vegetation,the underlay surface with coverage of fine sand vegetation,the dry underlay surface with gravel and the dry underlay surface with breccia crust is relatively large,It is the main type of underlying surface for dust control in the mining area.

Mots clés : underlying surface ;sand and dust horizontal flux ;aeolian flow structure ;granularity;arid open-pit mining area of Northwest ;

Présentation (CNKI)

Page publiée le 29 mars 2022