Early‐stage aeolian protodunes: Bedform development and sand transport dynamics

机译：早期的Aeolian Protodunes：床形式开发和砂输送动力学

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Abstract >Early‐stage aeolian bedforms, or protodunes, are elemental in the continuum of dune development and act as essential precursors to mature dunes. Despite this, we know very little about the processes and feedback mechanisms that shape these nascent bedforms. Whilst theory and conceptual models have offered some explanation for protodune existence and development, until now, we have lacked the technical capability to measure such small bedforms in aeolian settings. Here, we employ terrestrial laser scanning to measure morphological change at the high frequency and spatial resolution required to gain new insights into protodune behaviour. On a 0.06?m high protodune, we observe vertical growth of the crest by 0.005?m in two hours. Our direct measurements of sand transport on the protodune account for such growth, with a reduction in time‐averaged sediment flux of 18% observed over the crestal region. Detailed measurements of form also establish key points of morphological change on the protodune. The position on the stoss slope where erosion switches to deposition is found at a point 0.07?m upwind of the crest. This finding supports recent models that explain vertical dune growth through an upwind shift of this switching point. Observations also show characteristic changes in the asymmetric cross‐section of the protodune. Flow‐form feedbacks result in a steepening of the lee slope and a decline in lower stoss slope steepness (by 3°), constituting a reshaping of protodune form towards more mature dune morphology. The approaches and findings applied here, (a) demonstrate an ability to quantify processes at requisite spatial and temporal scales for monitoring early‐stage dune evolution, (b) highlight the crucial role of form‐flow feedbacks in enabling early‐stage bedform growth, alluding to a fluctuation in feedbacks that require b </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> >早期 - 舞台Aeolian玻璃窗体或Protodunes是在沙丘开发的连续之内进行元素，并作为成熟沙丘的必要前兆。尽管如此，我们对塑造这些新生叶形的过程和反馈机制很少了解。虽然理论和概念模型为Protoceune存在和开发提供了一些解释，直到现在，我们缺乏在Aeolian环境中测量这种小床位的技术能力。在这里，我们采用陆地激光扫描来测量高频和空间分辨率所需的形态变化，以获得新的洞察原种行为。在0.06？M高原型，我们在两小时内观察垂直于0.005Ω米的垂直生长。我们对这种生长的原型账户的砂输送的直接测量，减少了在壁龛区域观察到18％的时间平均沉积物通量。形式的详细测量还在原型的形态变化的关键点。折坡上的位置，其中腐蚀切换到沉积的点0.07？m upwind的挤压。这一发现支持最近通过该切换点的上行偏移来解释垂直沙丘增长的模型。观察还显示了原型的非对称横截面的特征变化。流动形式的反馈导致李坡的陡峭，下降坡度陡坡（3°）下降，构成了原型形式的重塑朝向更成熟的沙丘形态。在此处应用的方法和发现（a）表明了用于监测早期沙丘演化的必要空间和时间尺度的必要空间和时间尺度的能力，（b）突出了形式流反馈在实现早期床位的生长方面的关键作用，暗指需要B的反馈波动 </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1期</span><b style="margin: 0 2px;">|</b><span>共8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=Baddock Matthew C.&option=202" target="_blank" rel="nofollow">Baddock Matthew C.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Nield Joanna M.&option=202" target="_blank" rel="nofollow">Nield Joanna M.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Wiggs Giles F.S.&option=202" target="_blank" rel="nofollow">Wiggs Giles F.S.;</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 GeographyLoughborough UniversityLoughborough UK;</p> <p>Geography and EnvironmentUniversity of SouthamptonSouthampton UK;</p> <p>School of Geography and EnvironmentUniversity of OxfordOxford 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=protodune&option=203" rel="nofollow">protodune;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=bedform&option=203" rel="nofollow">bedform;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=TLS&option=203" rel="nofollow">TLS;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=sand strip&option=203" rel="nofollow">sand strip;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=dune initiation&option=203" rel="nofollow">dune initiation;</a> </p> <div class="translation"> 机译：Protodeune;床罩;TLS;沙剥;沙丘启动; </div> </li> </ul> </div> </div> <div class="literature cardcommon"> <div class="similarity "> <h3 class="all_title" id="enpatent66">相似文献</h3> <div class="similaritytab clearfix"> <ul> <li class="active" >外文文献</li> <li >中文文献</li> <li >专利</li> </ul> </div> <div class="similarity_details"> <ul > <li> <div> <b>1. </b><a class="enjiyixqcontent" href="/journal-foreign-detail/0704023139160.html">Early‐stage aeolian protodunes: Bedform development and sand transport dynamics</a> <b>[J]</b> . <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Baddock Matthew C.&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Baddock Matthew C.,</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Nield Joanna M.&option=202" target="_blank" rel="nofollow" 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