Effect of seepage on flow and bedforms dynamics

Patel Mahesh; Majumder Shantanaba; Kumar Bimlesh

摘要

Abstract >This study, using an experimental approach, focuses on the effect of downward seepage on a threshold alluvial channel morphology and corresponding turbulent flow characteristics. In all the experiments, we observed that the streamwise time‐averaged velocities and Reynolds shear stresses were increased under the influence of downward seepage. Scales of eddy length and eddy turnover time were significantly increased with the application of downward seepage, leading to sediment transport and initiation of bedforms along the channel length. As the amount of seepage discharge increased, eddy length and turnover time were further increased, causing the development of larger bedforms. It was revealed that the geometry of bedforms was linked with the size of eddies. In this work, statistics of bedform dynamics are presented in terms of multi‐scalar bedforms in the presence of seepage. These multi‐scalar ubiquitous bedforms cast a potential impact on flow turbulence as well as stream bed morphology in channels. We used wavelet to analyse temporally lagged spatial bed elevation profiles that were obtained from a set of laboratory experiments and synchronized the wavelet coefficients with bed elevation fluctuations at different length scales. A spatial cross‐correlation analysis, based on the wavelet coefficients, was performed on these bed elevation datasets to observe the effect of downward seepage on the dynamic behaviour of bedforms at different length scales. It was found that celerity of bedforms reduced with increase in seepage percentage. Bedform celerity was best approximated by a probability density function such as Rayleigh distribution under varying downward seepage. Further, statistical analysis of physical parameters of bedforms ascertained that the reduction in bedform celerity was a result of increased bedform size. Copyright ? 2017 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 XMLNS =“http://www.wiley.com/namespaces/wiley”type =“main”> <title type =“main”>抽象</ title> >本研究，使用实验方法，重点下渗流对阈值冲积通道形态的影响及对应的湍流特征。在所有实验中，我们观察到，在向下渗出的影响下，流动时间平均速度和雷诺剪切应力增加。随着向下渗出的施加，涡流长度和涡流周转时间的尺度显着增加，导致沉积物传输和沿沟道长度的朝向弯曲的启动。随着渗流放电的量增加，涡流长度和周转时间进一步增加，导致较大弯曲的弯曲。据透露，弯曲的几何形状与漩涡的大小连接。在这项工作中，在渗漏存在下的多标标床形状的方面呈现了床泡动力学的统计。这些多标量普遍存在的床泡对流动湍流以及通道中的流床形态施放了潜在的影响。我们使用小波分析了从一组实验室实验中获得的时间滞后的空间床升降型材，并将小波系数与不同长度尺度的床仰卧波动同步。基于小波系数的空间互相关分析在这些床仰角数据集上进行，观察向下渗出对不同长度尺度的弯曲动态行为的影响。发现弯曲的圆形弯曲率随着渗流百分比的增加而降低。达到尺寸的概率密度函数最佳近似诸如在不同向下渗出的瑞利分布之类的概率密度函数。此外，弯曲物理参数的统计分析确定了弯曲圆形圆锥花的减小是折弯尺寸增加的结果。版权？ 2017年John Wiley＆amp; 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>2017年第12期</span><b style="margin: 0 2px;">|</b><span>共13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=Patel Mahesh&option=202" target="_blank" rel="nofollow">Patel Mahesh;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Majumder Shantanaba&option=202" target="_blank" rel="nofollow">Majumder Shantanaba;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Kumar Bimlesh&option=202" target="_blank" rel="nofollow">Kumar Bimlesh;</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>Indian Institute of Technology GuwahatiGuwahati 781039 India;</p> <p>Indian Institute of Technology GuwahatiGuwahati 781039 India;</p> <p>Indian Institute of Technology GuwahatiGuwahati 781039 India;</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=bedforms&option=203" rel="nofollow">bedforms;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=wavelet cross‐correlation&option=203" rel="nofollow">wavelet cross‐correlation;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=celerity&option=203" rel="nofollow">celerity;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=seepage&option=203" rel="nofollow">seepage;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=integral scales&option=203" rel="nofollow">integral scales;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=turbulence&option=203" rel="nofollow">turbulence;</a> </p> <div class="translation"> 机译：叶形;小波互相关;eSerity;渗漏;整体鳞片;湍流; </div> </li> </ul> </div> </div> <div class="literature cardcommon" id="literaturereference" style="display:none"> <div class="similarity "> <h3 class="all_title" id="enpatent111">引文网络</h3> <div class="referencetab clearfix"> <ul id="referencedaohang"> <li dataid="referenceul">参考文献</li> <li dataid="citationul">引证文献</li> <li dataid="commonreferenceul">共引文献</li> <li dataid="commoncitationul">同被引文献</li> <li dataid="tworeferenceul">二级参考文献</li> <li dataid="twocitationul">二级引证文献</li> </ul> </div> <div class="reference_details" id="referenceList"> <ul id="referenceul"></ul> <ul id="citationul"></ul> <ul id="commonreferenceul"></ul> <ul id="commoncitationul"></ul> <ul id="tworeferenceul"></ul> <ul id="twocitationul"></ul> </div> </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/0704023139070.html">Effect of seepage on flow and bedforms dynamics</a> <b>[J]</b> . <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Patel Mahesh&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Patel Mahesh,</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Majumder Shantanaba&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Majumder Shantanaba,</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Kumar Bimlesh&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Kumar Bimlesh </a> <a href="/journal-foreign-22319/" target="_blank" rel="nofollow" class="tuijian_authcolor">Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group .</a> <span>2017</span><span>,第12期</span> </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：渗流对流动和弯曲动力学的影响</span> </p> </li> <li> <div> <b>2. </b><a class="enjiyixqcontent" href="/journal-foreign-detail/0704021966117.html">Downward seepage effects on dynamics of scour depth and migrating dune-like bedforms at tandem piers</a> <b>[J]</b> . <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Chavan Rutuja&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Chavan Rutuja,</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Kumar Bimlesh&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Kumar Bimlesh </a> <a href="/journal-foreign-15581/" target="_blank" rel="nofollow" class="tuijian_authcolor">Canadian Journal of Civil Engineering .</a> <span>2020</span><span>,第1期</span> </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：向下渗出渗透泄压探测和迁移的Dune样床在串联码头的渗透</span> </p> </li> <li> <div> <b>3. </b><a class="enjiyixqcontent" href="/academic-journal-foreign_detail_thesis/0204115782872.html">Upper flow regime bedforms on levees and continental slopes: Turbidity current flow dynamics in response to fine-grained sediment waves</a> <b>[J]</b> . <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Svetlana Kostic&option=202" target="_blank" rel="nofollow" class="tuijian_auth tuijian_authcolor">Svetlana Kostic </a> <a href="/journal-foreign-23492/" target="_blank" rel="nofollow" class="tuijian_authcolor">Geosphere .</a> <span>2014</span><span>,第6期</span> </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：堤坝和大陆坡的上层流态床形：响应细颗粒泥沙波的浑浊流动力学</span> </p> </li> <li> <div> <b>4. </b><a class="enjiyixqcontent" href="/academic-conference-foreign_meeting-288063_thesis/0705016312166.html">Measurements of flow dynamics associated with interacting, subaqueous barchans: Exploring bedform asymmetry and three-dimensionality in a novel flume environment</a> <b>[C]</b> . <span> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=N. 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