Length scales and statistical characteristics of outer bank roughness for large elongate meander bends: The influence of bank material properties, floodplain vegetation and flow inundation

机译：大长长曲折弯曲的外部银行粗糙度的长度和统计特性：银行材料特性，洪泛区植被和流量淹没的影响

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Abstract >This article explores the length scales and statistical characteristics of form roughness along the outer banks of two elongate bends on a large meandering river through investigation of topographic variability of the bank face. The analysis also examines how roughness varies over the vertical height of the banks and when the banks are exposed subaerially and inundated during flood stage. Detailed data on the topography of the outer banks were obtained subaerially using terrestrial LiDAR during low flow conditions and subaqueously using multibeam echo sounding (MBES) during near‐bankfull conditions. The contributions of various length scales of topographic irregularity to roughness for subaerial conditions were evaluated for different elevation contours on the bank faces using Hilbert–Huang Transform (HHT) spectral analysis. Statistical characteristics for discrete areas on the bank faces were determined by calculating the root‐mean‐square of normal distances from a triangulated irregular network (TIN) surface. Results of the HHT analysis show that the characteristics of roughness along bank faces composed primarily of non‐cohesive sediment, and eroding into cropland, vary with bank elevation and exhibit a dominant range of roughness length scales (~15–50?m). However, bank faces composed predominantly of cohesive material and carved into a forested floodplain have relatively uniform topographic roughness characteristics over the vertical extent of the bank face and do not exhibit a dominant roughness length scale or range of length scales. Additionally, comparison between local surface roughness for subaerial versus subaqueous conditions shows that roughness decreases considerably when the banks are submerged, most likely because of the removal of vegetation and eradication of small‐scale erosional features in non‐cohesive bank materials by flow along the bank face. Thus, roughness appears to be linked to the hydraulic conditions affecting the bank, at least relative to conditions that develop when banks are exposed subaerially. 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> >本文探讨了长度尺度和统计特征通过调查岸边的地形变异性，在大蜿蜒河上的两个细长弯曲的外部粗糙度的形式粗糙度。分析还研究了粗糙度如何在岸边的垂直高度和洪水阶段淹没时彻底暴露。在低流动条件下使用陆生激光雷达和在近乎银行的条件下使用多射流回声声使用Hilbert-Huang变换（HHT）光谱分析，评估了对堤岸面上的不同高度轮廓进行了各种长度尺度对粗糙度的粗糙度的贡献。通过计算来自三角形的不规则网络（TIN）表面的正常距离的根均线来确定堤岸面上的离散区域的统计特性。 HHT分析结果表明，沿着非粘性沉积物组成的粗糙度粗糙度的特点，侵蚀土壤，含有银行高程，粗糙度长度尺度的主导范围（〜15-50μm）。然而，主要由粘性材料组成的银行面并雕刻成森林泛洪叶的地形粗糙度特征在银行面的垂直范围内具有相对均匀的地形粗糙度特征，并且不会表现出优势粗糙度长度或长度范围。此外，对于子系统与亚水条件的局部表面粗糙度之间的比较表明，当银行浸没时，粗糙度大大降低，最有可能因沿岸的流量去除非凝聚力库材料中的植被和消除小规模侵蚀特征脸。因此，粗糙度似乎与影响堤的液压条件相关联，至少相对于开发的条件，当银行均匀地暴露时。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13期</span><b style="margin: 0 2px;">|</b><span>共14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=Konsoer Kory&option=202" target="_blank" rel="nofollow">Konsoer Kory;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Rhoads Bruce&option=202" target="_blank" rel="nofollow">Rhoads Bruce;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Best James&option=202" target="_blank" rel="nofollow">Best James;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Langendoen Eddy&option=202" target="_blank" rel="nofollow">Langendoen Eddy;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Ursic Mick&option=202" target="_blank" rel="nofollow">Ursic Mick;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Abad Jorge&option=202" target="_blank" rel="nofollow">Abad Jorge;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Garcia Marcelo&option=202" target="_blank" rel="nofollow">Garcia Marcelo;</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 Geography and AnthropologyLouisiana State UniversityBaton Rouge LA USA;</p> <p>Geography and Geographic Information ScienceUniversity of Illinois at Urbana‐ChampaignChampaign IL USA;</p> <p>Geography and Geographic Information ScienceUniversity of Illinois at Urbana‐ChampaignChampaign IL USA;</p> <p>Agricultural Research Service National Sedimentation LaboratoryUSDAOxford MS USA;</p> <p>Agricultural Research Service National Sedimentation LaboratoryUSDAOxford MS USA;</p> <p>Civil and Environmental EngineeringUniversity of PittsburghPittsburgh PA USA;</p> <p>Ven Te Chow Hydrosystems LaboratoryUniversity of Illinois at Urbana‐ChampaignChampaign IL USA;</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=fluvial geomorphology&option=203" rel="nofollow">fluvial geomorphology;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=multibeam echo sounding&option=203" rel="nofollow">multibeam echo sounding;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=terrestrial LiDAR&option=203" rel="nofollow">terrestrial LiDAR;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=meander bank roughness&option=203" rel="nofollow">meander bank roughness;</a> </p> <div class="translation"> 机译：氟晶状体;多次阵容回声探测;地面潮流乐队;蜿蜒的银行粗糙度; 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