Straw checkerboard sand barriers with a porous structure that consists of a pervious upper portion and a dense lower portion are widely used to achieve great sand control effect.Considering this,and resolving the seri...Straw checkerboard sand barriers with a porous structure that consists of a pervious upper portion and a dense lower portion are widely used to achieve great sand control effect.Considering this,and resolving the serious earth surface undercutting problem after HDPE sandbreak net checkboard barriers setting,the authors used HDPE(high-density polyethylene)materials to prepare new sandbreak materials with a similar porous structure.Through wind tunnel simulations and field sand control monitoring,we compared the sand control effect of three HDPE sandbreak nets with different porosity structure.Compared to the sandbreak net with uniform porosity structure,the three types of HDPE sandbreak nets with different porosity structure had poorer effect on reducing sand transport rates,but had longer effective protection distance before sandbreak nets at low wind velocity conditions(<12 m/s),longer effective protection distance at high wind velocity(>14 m/s)and longer effective protection distance between sandbreak nets at all experimental wind velocity conditions.Wind and sand control effect characteristics of HDPE sandbreak nets with different porosity structure provide an ideal material on semiburied checkerboard sand barriers for sand stabilization.By contrast,uniform-type sandbreak nets are used as materials on high upright sand fences for sand blocking.These HDPE sandbreak nets can be used to replace traditional sandbreak materials and have a very high potential for widespread and popular application in aeolian sand disaster control.展开更多
Aeolian disasters pose considerable threats to socioeconomic systems,ecological environments,and infrastructures such as railways and highways,in arid and semiarid regions.To reduce these problems,mechanical sand cont...Aeolian disasters pose considerable threats to socioeconomic systems,ecological environments,and infrastructures such as railways and highways,in arid and semiarid regions.To reduce these problems,mechanical sand control measures are needed,with sand barriers being the most widely applied.However,conventional materials of sand barriers,such as crop straws,reeds,branches,High-Density Polyethylene(HDPE),and biodegradable Polylactic Acid(PLA),have drawbacks,including susceptibility to aging,unsuitability for extreme temperatures and severe wind erosion,as well as short service life.This study introduces new porous sand barriers made from decommissioned or damaged wind turbine blades.The results of mechanical performance testing,wind tunnel experiments,and numerical simu-lations indicated that the bending strength of the new sand barrier was 14 times that of wood composite materials and its erosion rate can be 56%lower.The new sand barriers with different porosities effec-tively reduced sediment transport,and the optimal porosity was found to be 20%;while higher or lower porosities were detrimental to sand control.The combined advantages of porous structure,flexibility,and strength of this new sand barrier make it well suited for regions with strong winds,large temper-ature variations,and intense ultraviolet(UV)radiation.Utilizing decommissioned or damaged wind turbine blades as sand control materials shows great potential for application.展开更多
基金fund by Strategic Priority Research Program of the Chinese Academy of Sciences(XD23060201)the National Natural Science Foundation of China(41730644,42171016,)。
文摘Straw checkerboard sand barriers with a porous structure that consists of a pervious upper portion and a dense lower portion are widely used to achieve great sand control effect.Considering this,and resolving the serious earth surface undercutting problem after HDPE sandbreak net checkboard barriers setting,the authors used HDPE(high-density polyethylene)materials to prepare new sandbreak materials with a similar porous structure.Through wind tunnel simulations and field sand control monitoring,we compared the sand control effect of three HDPE sandbreak nets with different porosity structure.Compared to the sandbreak net with uniform porosity structure,the three types of HDPE sandbreak nets with different porosity structure had poorer effect on reducing sand transport rates,but had longer effective protection distance before sandbreak nets at low wind velocity conditions(<12 m/s),longer effective protection distance at high wind velocity(>14 m/s)and longer effective protection distance between sandbreak nets at all experimental wind velocity conditions.Wind and sand control effect characteristics of HDPE sandbreak nets with different porosity structure provide an ideal material on semiburied checkerboard sand barriers for sand stabilization.By contrast,uniform-type sandbreak nets are used as materials on high upright sand fences for sand blocking.These HDPE sandbreak nets can be used to replace traditional sandbreak materials and have a very high potential for widespread and popular application in aeolian sand disaster control.
基金supported by the National Key Research and Development Program of China(2022YFB4202102)the Key Research and Development Projects of Ningxia Hui Autonomous Region(2022BEG02003)+1 种基金Major Science and Technology Projects of Inner Mongolia Autonomous Region“Open Bidding for Selecting the Best Candidates”(2024JBGS0009-01)the Excellent Member of Youth Innovation Promotion Association CAS(No.Y202085).
文摘Aeolian disasters pose considerable threats to socioeconomic systems,ecological environments,and infrastructures such as railways and highways,in arid and semiarid regions.To reduce these problems,mechanical sand control measures are needed,with sand barriers being the most widely applied.However,conventional materials of sand barriers,such as crop straws,reeds,branches,High-Density Polyethylene(HDPE),and biodegradable Polylactic Acid(PLA),have drawbacks,including susceptibility to aging,unsuitability for extreme temperatures and severe wind erosion,as well as short service life.This study introduces new porous sand barriers made from decommissioned or damaged wind turbine blades.The results of mechanical performance testing,wind tunnel experiments,and numerical simu-lations indicated that the bending strength of the new sand barrier was 14 times that of wood composite materials and its erosion rate can be 56%lower.The new sand barriers with different porosities effec-tively reduced sediment transport,and the optimal porosity was found to be 20%;while higher or lower porosities were detrimental to sand control.The combined advantages of porous structure,flexibility,and strength of this new sand barrier make it well suited for regions with strong winds,large temper-ature variations,and intense ultraviolet(UV)radiation.Utilizing decommissioned or damaged wind turbine blades as sand control materials shows great potential for application.
