本文選題：沙丘 + 固定��； 參考：《中國沙漠》2016年05期

【摘要】：以1998—2014年5期庫布齊沙漠南緣的遙感影像為主要數(shù)據(jù)源,結(jié)合野外調(diào)查分析了沙丘固定與活化過程中的形態(tài)演變,探討了區(qū)域風(fēng)況和降水等氣象要素對沙丘固定與活化及形態(tài)演變的影響。結(jié)果表明:研究區(qū)沙丘隨降水量的年際波動經(jīng)歷了固定-活化-再固定3個(gè)階段。監(jiān)測初期的片狀流動沙丘演變?yōu)榇笮蛼佄锞�形沙丘并得以固定,固定的拋物線形沙丘以發(fā)育風(fēng)蝕坑形式活化,進(jìn)而形成多個(gè)拋物線形沙丘,最后這些沙丘又被植被固定,沙丘形態(tài)趨于更加復(fù)雜。但在此過程中,風(fēng)的作用并不顯著。研究區(qū)拋物線形沙丘既可起源于新月形沙丘或片狀流沙,也可由風(fēng)蝕坑發(fā)育而成,其中植被作為沙丘的重要組成部分,起著重要作用。同時(shí)發(fā)現(xiàn)在拋物線形沙丘移動過程中,當(dāng)背風(fēng)坡發(fā)育滑落面時(shí),沙丘的移動最快。
[Abstract]:Taking the remote sensing images of the southern edge of Kubuqi Desert from 1998 to 2014 as the main data sources, the morphological evolution during the process of sand dune fixation and activation was analyzed in combination with field investigation. The effects of regional wind and precipitation on sand dune fixation, activation and morphological evolution are discussed. The results show that the interannual fluctuation of sand dunes with precipitation in the study area has experienced three stages: fixation, activation and refixation. At the beginning of the monitoring period, the sheet flow dune evolved into a large parabolic dune and was fixed. The fixed parabolic dune was activated in the form of a developed wind erosion pit, and then formed multiple parabolic dunes, which were finally fixed by vegetation. Sand dune forms tend to be more complex. However, in this process, the role of wind is not significant. The parabolic sand dunes in the study area can be derived from either crescent dune or flaky quicksand, or developed from wind erosion pits, in which vegetation plays an important role as an important part of sand dunes. It is also found that during the movement of parabolic dunes, the sand dunes move fastest when the leeward slope develops a sliding surface.
【作者單位】： 北京師范大學(xué)資源學(xué)院;
【基金】：十三五國家重點(diǎn)研發(fā)計(jì)劃課題(2016YFC0500805) 國家自然科學(xué)基金項(xiàng)目(41671002,41171002)
【分類號】：P931.3;P237

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