Transformation of parabolic dunes into mobile barchans triggered by environmental change and anthropogenic disturbance

Yan Na; Baas Andreas C.W.

摘要

Abstract >Parabolic dunes are widely distributed on coasts and margins of deserts and steppes where ecosystems are vulnerable and sensitive to environmental changes and human disturbances. Some studies have indicated that vegetated parabolic dunes can be activated into highly mobile barchan dunes and the catastrophic shift of eco‐geomorphic systems is detrimental to land management and social‐economic development; however, no detailed study has clarified the physical processes and eco‐geomorphic interactions that control the stability of a parabolic dune and its resistance to unfavorable environmental changes. This study utilizes the Extended‐DECAL (Discrete Eco‐geomorphic Aeolian Landscapes) model, parameterized by field measurements of dune topography and vegetation characteristics combined with remote sensing, to explore how increases in drought stress, wind strength, and grazing stress may lead to the activation of stabilizing parabolic dunes into highly mobile barchans. The modeling results suggest that the mobility of an initial parabolic dune at the onset of a perturbation determines the capacity of a system to absorb environmental change, and a slight increase in vegetation cover of an initial parabolic dune can increase the activation threshold significantly. The characteristics of four eco‐geomorphic interaction zones control the processes and resulting morphologies of the transformations. A higher deposition tolerance of vegetation increases the activation threshold of the dune transformation under both a negative climatic impact and an increased sand transport rate, whereas the erosion tolerance of vegetation influences the patterns of resulting barchans (a single barchan versus multiple barchans). The change in the characteristics of eco‐geomorphic interaction zones may indirectly reflect the dune stability and predict an </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> <div class="translation abstracttxt"> <span class="zhankaihshouqi fivelineshidden" id="abstract"> <span>机译：</span><abstract xmlns =“http://www.wiley.com/namespaces/wiley”type =“main”xml：lang =“en”> <title type =“main”>抽象</ title> >抛物线沙丘广泛分布在沙漠和草原的海岸和边缘，在那里生态系统易受伤害和对环境变化和人类骚乱敏感的。一些研究表明，植被的抛物线沙丘可以激活到高度移动的巴恰沙丘，生态地貌系统的灾难性转变对土地管理和社会经济发展有害;然而，没有详细的研究阐明了控制抛物线沙丘的稳定性的物理过程和生态地貌相互作用及其对不利环境变化的抵抗力。本研究利用了延长贴花（离散生态地貌Aeolian景观）模型，通过Dune地形和植被特性的现场测量参数化，与遥感相结合，探讨干旱压力，风力和放牧压力的增加可能导致激活授予抛物面沙丘进入高度移动巴克人。建模结果表明，扰动发生初始抛物线沙丘的移动性决定了吸收环境变化的系统的能力，并且初始抛物线沙丘的植被覆盖的略微增加可以显着增加激活阈值。四种生态地貌相互作用区的特征控制了转化的过程和导致的形态。植被的较高沉积耐受性增加了在阴性气候冲击和增加的砂运输速率下的沙丘转化的激活阈值，而植被的侵蚀耐受性会影响由此产生的Barchans（单个Barchan与多个Barchans）的模式。生态地貌互动区域特征的变化可以间接地反映了沙丘稳定性并预测 </span> <span class="z_kbtn z_kbtnclass hoverxs" style="display: none;">展开▼</span> </div> </div> <div class="record"> <h2 class="all_title" id="enpatent33" >著录项</h2> <ul> <li> <span class="lefttit">来源</span> <div style="width: 86%;vertical-align: text-top;display: inline-block;"> <a href='/journal-foreign-22319/'>《Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group》</a> <b style="margin: 0 2px;">|</b><span>2018年第5期</span><b style="margin: 0 2px;">|</b><span>共18页</span> </div> </li> <li> <div class="author"> <span class="lefttit">作者</span> <p id="fAuthorthree" class="threelineshidden zhankaihshouqi"> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Yan Na&option=202" target="_blank" rel="nofollow">Yan Na;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Baas Andreas C.W.&option=202" target="_blank" rel="nofollow">Baas Andreas C.W.;</a> </p> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zkzz" style="display: none;">展开▼</span> </div> </li> <li> <div style="display: flex;"> <span class="lefttit">作者单位</span> <div style="position: relative;margin-left: 3px;max-width: 639px;"> <div class="threelineshidden zhankaihshouqi" id="fOrgthree"> <p>Department of GeographyKing's College LondonLondon UK;</p> <p>Department of GeographyKing's College LondonLondon UK;</p> </div> <span class="z_kbtnclass z_kbtnclassall hoverxs" id="zhdw" style="display: none;">展开▼</span> </div> </div> </li> <li > <span class="lefttit">收录信息</span> <span style="width: 86%;vertical-align: text-top;display: inline-block;"></span> </li> <li> <span class="lefttit">原文格式</span> <span>PDF</span> </li> <li> <span class="lefttit">正文语种</span> <span>eng</span> </li> <li> <span class="lefttit">中图分类</span> <span><a href="https://www.zhangqiaokeyan.com/clc/163.html" title="地球物理学">地球物理学;</a></span> </li> <li class="antistop"> <span class="lefttit">关键词</span> <p style="width: 86%;vertical-align: text-top;"> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=dune activation&option=203" rel="nofollow">dune activation;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=water stress&option=203" rel="nofollow">water stress;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=wind strength&option=203" rel="nofollow">wind strength;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=overgrazing&option=203" rel="nofollow">overgrazing;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=eco‐geomorphic interaction&option=203" rel="nofollow">eco‐geomorphic interaction;</a> </p> <div class="translation"> 机译：沙丘激活;水分胁迫;风力;过度凝视;生态地貌互动; 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