Reconstructing ice‐flow fields from streamlined subglacial bedforms: A kriging approach

Ng Felix S. L.; Hughes Anna L. C.

摘要

Abstract > The orientation of several landforms, e.g. drumlins, flutes, crag‐and‐tails, and mega‐scale glacial lineations, records the direction of the overlying ice flow that created them. Populations of such features are used routinely to infer former ice‐flow patterns, which serve as the building blocks of reconstructions of palaeo ice‐sheet evolution. Currently, the conceptualisation of flow patterns from these flow‐direction records is done manually and qualitatively, so the extractable glaciological information is limited. We describe a kriging method (with <sc>Matlab</sc> code implementation) that calculates continuous fields of ice‐flow direction, convergence, and curvature from the flow‐direction records, and which yields quantitative results with uncertainty estimates. We test the method by application to the subglacial bedforms of the Tweed Valley Basin, UK. The results quantify the convergent flow pattern of the Tweed Palaeo‐Ice Stream in detail and pinpoint its former lateral shear margins and where ice flowed around basal bumps. Ice‐flow parameters retrieved by this method can enrich ice‐sheet reconstructions and investigations of subglacial till processes and bedform genesis. ? 2018 The Authors. Earth Surface Processes and Landforms published by John Wiley & Sons Ltd. </abstract> </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 Type =“main”XML：Lang =“en”> <标题类型=“main”>抽象</ title> >几个地形的方向，例如， Drumlins，虎笛，裂缝和尾部和Mega-Scale冰川地区，记录创建它们的上覆冰流的方向。这些特征的群体通常用于推断以前的冰流模式，它用作古刀冰纸进化的重建的构建块。目前，从这些流向记录的流动模式的概念化是手动和定性完成的，因此可提取的冰川癖信息是有限的。我们描述了一种Kriging方法（利用<SC> Matlab </ SC>代码实现），其计算冰流方向，收敛和曲率的连续场，并从流动方向记录中产生定量结果。我们通过应用于英国Tweed Valley Basin的底掩模床形式测试该方法。结果详细量化了TweedPalaeo-冰流的收敛流程，并定位了其前横向剪切边缘，并在基底凸块周围流动的冰。通过该方法检索的冰流量参数可以丰富冰片重建和对过程和耐叶片起草的研究。还2018年作者。 John Wiley＆amp出版的地表过程和地貌; Sons Ltd. </ P> </ Abstract> </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>2019年第4期</span><b style="margin: 0 2px;">|</b><span>共16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=Ng Felix S. L.&option=202" target="_blank" rel="nofollow">Ng Felix S. L.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Hughes Anna L. C.&option=202" target="_blank" rel="nofollow">Hughes Anna L. C.;</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 GeographyUniversity of SheffieldSheffield S10 2TN UK;</p> <p>Department of Earth ScienceUniversity of Bergen and Bjerknes Centre for Climate ResearchN‐5020 Bergen Norway;</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=glacial reconstruction&option=203" rel="nofollow">glacial reconstruction;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=palaeoglaciology&option=203" rel="nofollow">palaeoglaciology;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=kriging&option=203" rel="nofollow">kriging;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=subglacial bedforms&option=203" rel="nofollow">subglacial bedforms;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=ice stream&option=203" rel="nofollow">ice stream;</a> </p> <div class="translation"> 机译：冰川重建;古刺激学;Kriging;子涂层叶片;冰流; </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/0704023138911.html">Reconstructing ice‐flow fields from streamlined subglacial bedforms: A kriging approach</a> <b>[J]</b> . <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Ng Felix S. 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href="/patent-detail/061203649478.html">一种基于实测值预测流场分布的高精度克里格测试方法</a> <b>[P]</b> . <span> 中国专利： CN105675245B </span> <span> . 2020.03.03</span> </div> </li> <li> <div> <b>2. </b><a class="enjiyixqcontent" href="/patent-detail/06120108167910.html">一种基于实测值预测流场分布的高精度克里格测试方法</a> <b>[P]</b> . <span> 中国专利： CN105675245A </span> <span> . 2016-06-15</span> </div> </li> <li> <div> <b>3. </b><a class="enjiyixqcontent" href="/patent-detail/06130459869575.html">Method of hydraulic tomography to identify spaced permeability in subsoil - involves forming non=stationary flow fields whose permeability is numerically reconstructed by pore water pressure and volume flow measurements</a> <b>[P]</b> . <span> 外国专利：  DE4236692A1 </span> <span> . 1994-05-05</span> </div> <p class="zwjiyix translation" style="max-width: initial;height: auto;word-break: break-all;white-space: initial;text-overflow: initial;overflow: initial;"> <span>机译：水力层析成像法确定地下土壤中的渗透率的方法-涉及形成非静态流场，其渗透率通过孔隙水压力和体积流量测量在数值上重建 </span> </p> </li> 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