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

Accueil du site → Master → Chine → 2015 → Spatial And Temporal Distribution Characteristics of Sand Drift Potential in Taklimakan Desert Based on The ‘Fryberger’ Method

Sichuan Normal University (四川师范大学) 2015

Spatial And Temporal Distribution Characteristics of Sand Drift Potential in Taklimakan Desert Based on The ‘Fryberger’ Method

房彦杰

Titre : Spatial And Temporal Distribution Characteristics of Sand Drift Potential in Taklimakan Desert Based on The ‘Fryberger’ Method

Auteur : 房彦杰

Grade : Master’s Theses 2015

Université : Sichuan Normal University (四川师范大学)

Résumé partiel
Taklimakan Desert is the largest area of China, ranking second in the world of the active desert. Because of the vast area, extreme arid climate and the loose sandy surface of Taklimakan Desert, the activities of blown sand have an important impact on the global material transport and climates. So, many scholars do researches on the intensity of blown sand activity in Taklimakan. Sand drift potential is a useful index for assessing the wind-energy of blown sand, which plays an important role in the formation of aeolian landforms. It is widely used to evaluate the dynamic conditions of the drifting sand activity.The Fryberger method provides a simple and practical model to evaluate the value of drift potential(DP) from measurements of wind velocity. Unfortunately, there is still some doubt about the process of DP calculation, and it would influence the accuracy of DP. Thus, the clarification of some confusion about DP is given with the example calculations of using Fryberger method at the first. Whereas the accuracy of the DP values and its differences between wind velocity-type calculated in Fryberger model are required for each site. Then, the most precise values of DP calculated from the definition-based method are expressed as the reference values(DP*), the annual DPs at the five sites and their components corresponding to each wind class are estimated to compare the different deviations of DP from the DP* distinguished by local sites and wind velocity classes. After that, using the Fryberger method, the spatial and temporal distribution characteristics of sand activity in the desert is to be studied.On the basis of the varied wind data recorded hourly from twenty-one sites in Taklimakan Desert from 2005 to 2007 and Cele site in 2007 to 2013, firstly, the deviations of Fryberger model are estimated. Secondly, using the definition-based method calculated the DP, resultant drift potential(RDP), resultant drift direction(RDD) and the index of the effective wind directional variability(r).

Mots clés : sand drift potential ;Fryberger method ;deviation estimates ;Taklimakan Desert ;spatial-temporal distribution of sand drift potential ;

Présentation (CNKI)

Page publiée le 16 avril 2022