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Lanzhou Jiaotong University (2020)

Potential Risk Assessments and Spatial-temporal Patterns of Wind-blown Sand Disaster


Titre : Potential Risk Assessments and Spatial-temporal Patterns of Wind-blown Sand Disaster

Auteur : 王玉竹;

Grade : Master’s Theses 2020

Université : Lanzhou Jiaotong University

Résumé partiel
Wind-blown sand disaster is a typical wind secondary disaster,its damage range is very wide,especially in agriculture,animal husbandry,transportation and ecological environment and other fields.In recent years,the wind-blown sand disasters in arid and semi-arid areas in northern China were getting worse and the losses were increasing with the gradual warming of the global climate and the unreasonable utilization of water and soil resources,which seriously affects the sustainable development of local social economy and ecological environment.At present,there are not only few research achievements in the assessment of wind-blown sand disasters,but also the problem of unreasonable selection of assessment data,which leads to the low accuracy of the assessment results.In view of this,based on the formation mechanism and disaster-causing characteristics of wind-blown sand disaster,combined with the basic theory of disaster science,the wind-blown sand disaster evaluation model including 14 indexes of 3 factors were established using remote sensing data and statistical data in 2000,2005,2010,2015,and 2018.And the spatial-temporal patterns on the danger of disaster-causing factors,the sensitivity of disaster-causing environment,the vulnerability disaster-bearing body,and the risk of wind-blown sand disaster were studied.At the same time,the reasons for this pattern were also analyzed.The main conclusions are as follows :(1)The spatial distribution characteristics on the danger of disaster-causing factors indicate that the highly risk areas in Xinjiang are mainly distributed in the hinterland of the Taklamakan Desert and Kumtag Desert with strong wind and abundant sand sources.The interannual variation trend shows that the risk distribution of the disaster-causing factors in the study area in recent 20 years is obviously uneven,and the increasing and decreasing regions are interlaced with each other.The significant increasing zones are mainly concentrated in Bayingolin Mongol Autonomous Prefecture,while the significant decreasing regions are mainly concentrated in Hotan,Kashgar and Atux.(2)The spatial pattern on the sensitivity of disaster-causing environment shows that the highly sensitive areas in Xinjiang are mainly concentrated in the Gobi desert zone with insufficient rainfall and sparse vegetation,while the less sensitive areas mainly located in the Tianshan Mountains region,the Tae basin,the Altai Mountains and the oasis region on the edge of Taklamakan Desert with abundant rainfall and lush vegetation

Mots clés : Xinjiang; Wind-blown sand disaster; Risk assessment;

Présentation (CNKI)

Page publiée le 18 mai 2021