Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Master → Chine → 2019 → Study on the Benefits of Wind and Sand Fixing of Wheat Straw Poly Lactic Acid Fiber and Their Mixed Sand Barriers

Inner Mongolia Normal University (2019)

Study on the Benefits of Wind and Sand Fixing of Wheat Straw Poly Lactic Acid Fiber and Their Mixed Sand Barriers

王雨浩;

Titre : Study on the Benefits of Wind and Sand Fixing of Wheat Straw Poly Lactic Acid Fiber and Their Mixed Sand Barriers

Auteur : 王雨浩;

Grade : Master’s Theses 2019

Université : Inner Mongolia Normal University

Résumé
Sand barriers can effectively fix drifting sand dunes and weaken the harm of sandstorm.It is an important means in sand control projects.The sand barriers’ benefit of windbreak and sand fixation is different with its specifications,materials and shapes.In this study,six different types and sizes of sand barriers were constructed using straw and Poly Lactic Acid(PLA)materials in Barrun Biel Town,Bayan Hot City,Alxa league from 2017 to 2018.They were 1m×1m straw sand barrier,1.5m×1.5m straw sand barrier,1m×1m straw and PLA mixed sand barrier,1.5m×1.5m straw and PLA mixed sand barrier,1m×1m PLA sand barrier,1.5m× 1.5m PLA sand barrier respectively.Through field construction,observation,sampling and laboratory experiments,a series of indicators such as wind speed efficiency,surface roughness,sediment transport,erosion and surface soil particle size were measured.The windbreak and sand fixation benefits in sand barriers of different types and specifications were compared.The result showed that:Windbreak benefits of sand barrier : 1m×1mstraw sand barrier>1.5m×1.5m straw sand barrier>1m×1m straw and PLA mixed sand barrier>1.5m×1.5m straw and PLA mixed sand barrier>1m×1mPLA sand barrier>1.5m×1.5mPLA sand barrier.Sand fixation benefits of sand barrier:1m×1mstraw sand barrier>1.5m×1.5m straw sand barrier>1m×1m straw and PLA mixed sand barrier > 1.5m×1.5m straw and PLA mixed sand barrier > 1.5m× 1.5mPLA sand barrier>1m×1mPLA sand barrier.In terms of sand-fixing benefits,six sand barriers can all play a certain role in the fixed sand dunes.Compared with bare sand dunes,the degree of wind erosion and wind accumulation in the sand barriers area were significantly weakened.The particle size of surface soil in windward slope was increased and the particle size in leeward slope was decreased.Sand-fixing benefits in 1m×1m straw sand barrier,1.5m×1.5m straw sand barrier and 1m×1m straw and PLA mixed sand barrier were better than that in 1.5m×1.5m PLA sand barrier,1m×1m PLA sand barrier and 1.5m×1.5m straw and PLA mixed sand barrier.Sand fixation effect was the worst in the 1.5m×1.5m straw and PLA mixed sand barrier.In summary,in the early stage of sand barriers deployment,six kinds of sand barriers all have certain wind-prevention and sand-fixing benefits.Under the same sand barrier materials,wind-prevention and sand-fixing benefits in the sand barrier of 1m specification was better than that in the sand barrier of 1.5m.In the case of the same sand barrier specification,the windbreak and sand fixation benefits in straw sand barrier was better than that in the PLA sand barrier.The windbreak and sand fixation benefits in straw and PLA mixed sand barrier was slightly worse than that in straw sand barrier,but it was also better than that in PLA sand barrier.

Mots clés : http://oversea.cnki.net/kcms/detail...

Présentation (CNKI)

Page publiée le 29 avril 2020