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

Accueil du site → Master → Chine → 2004 → Study on Soil Wind Erosion and Efficiency of Wind Prevention and Sand Resistance of Artificial Vegetation at Sand-land in Yongding River in Beijing

Beijing Forestry University (2004)

Study on Soil Wind Erosion and Efficiency of Wind Prevention and Sand Resistance of Artificial Vegetation at Sand-land in Yongding River in Beijing

刘永兵;

Titre : Study on Soil Wind Erosion and Efficiency of Wind Prevention and Sand Resistance of Artificial Vegetation at Sand-land in Yongding River in Beijing

Auteur : 刘永兵;

Grade : Master’s Theses 2004

Université : Beijing Forestry University

Résumé
Yongding River sand land is the largest area of wind-sand land sand and is one of the most severe wind sand damage region in Beijing,Which has important influence to eco-entironment in Beijng.lt has significance in theory and practice to study law of wind sand and efficiency of preventation and control for improving the eco-environmet in Yongding River sand land and in Beijing.This paper chooses four land use types,including cultivatend lands,forest land,waste land and moving sand land.we studies wind erosion rule by obeseving experiments of fixed poits and quantitative analysis in different land use types .The results show that :(l)The near ground wind velocity character at the height of 2m is that : wind velocity and height yielded the logarithm distribution ; there are significant differences among different ground cover roughness ; there are different friction velocities which are increasing with the increase of height. (2)There are significant differences in the minimum threshold wind speed in different land use types. In the same wind velocity, there are minus exponential relation between the sediment discharge percent and the height in the height of 0-20cm air flow layer. There is significant exponential relation between sediment transport concentration and wind velocity. (3) Vegetation coverage and wind erosion yield the minus exponential relation. When vegetation coverage is 45-60%, it can achieve the object of wind erosion prevention. (4) Dune surface wind velocity distribution differences can lead to wind erosion and aeolian sand in different part of the dune.This paper chooses four different artificial vegetation types,including pear orchard,forest belt and patch forest. Based on observation experiments of fixed poits and quantitative analysis,and analyzing the efficiency of wind prevention and sand resistance of artificial vegetation, the result shows that : Patch forest has the most effective function of wind prevention in 1-1 OH from windward side, with theprotective ratio of 22% ; pear orchard has the most effective function of wind prevention in 1 7H from windward side, with the protective ratio of 68.8% ; forest belt has the effective function of wind prevention in 1-20H from leeward side, with the protective ratio of 32%.The order of the three types of artificial vegetation on sand resistance is forest belt < patch forest < pear orchard.

Mots clés : Yongding River Sand Land; Soil Wind Erosion; Artificial Vegetation; Wind Prevention and Sand Resistance;

Présentation (CNKI)

Page publiée le 7 octobre 2017