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Lanzhou University (2019)

Preliminary Exploration and Application on A Coupled Dynamical Model of Vegetation-Wind Erosion-Hydrology

汪洋;

Titre : Preliminary Exploration and Application on A Coupled Dynamical Model of Vegetation-Wind Erosion-Hydrology

Auteur : 汪洋;

Grade : Master’s Theses 2019

Université : Lanzhou University

Résumé partiel
Global desertification is a major ecological and environmental problem that has affected human survival and development since the 20 th century.Desertification refers to the phenomenon of land degradation in arid,semi-arid and sub-humid arid regions caused by natural climate variation and human activities and it’s the main reason that restricts the economic development of arid and semi-arid areas.The sandstorm phenomenon accompanied by desertification will worsen the ecological environment,threaten human health and cause great economic losses to human society.There is also a reverse development process of desertification in the desert zone—oasisization.The increase of the oasis area is the result of the continuous growth and reproduction of vegetation,and there is a dynamic evolution process between the oasis and the desert.Previous studies on desertification and oasisization are independent of each other,and are generally carried out in three aspects : vegetation,wind erosion and soil moisture.Although the research on the evolution law between desert and oasis has been carried out,the current model does not fully establish the coupling mechanism of vegetation,wind erosion and hydrology,so it is difficult to accurately describe the dynamic evolution of desertification and oasis.Using vegetation coverage,wind erosion rate,moisture index as the three quantities to measure the development of vegetation,wind erosion and hydrology in the region,considering the coupling effect between the three and the influence of human activities on its development,vegetation-wind erosion-hydrology coupled dynamical model which has simple structure and clear physical meaning is established.When applied to Xilingol area,the model has a high accuracy in simulating the evolution of vegetation,wind erosion and hydrology in the process of desertification and oasisization,and the calculated value is in good agreement with the measured valu

Mots clés : Desertification; Oasisization; Coupled dynamic model; Xilingol area

Présentation (CNKI)

Page publiée le 22 mai 2020