Alternate bar dynamics in response to increases and decreases of sediment supply

Bankert Andrew R.; Nelson Peter A.; Bristow Charlie

摘要

Abstract >Gravel‐bed rivers can accommodate changes in sediment supply by adjusting their bed topography and grain size in both the downstream and cross‐stream directions. Under high supply aggradational conditions, this can result in spatially non‐uniform stratigraphic patterns, and the morphodynamic influence of heterogeneous stratigraphy during subsequent degradational periods is poorly understood and has not been studied through physical modelling. A flume experiment was conducted to analyse channel response where alternate bars were developed in a gravel–sand mixture under constant discharge and sediment supply before two supply increases led to the development of heterogeneous stratigraphy beneath alternate bars. The supply was then reduced back to the initial supply rate, causing degradation through that self‐formed stratigraphy. Stratigraphic samples were collected, and the bed topography and flow depth were measured frequently, which were used with a two‐dimensional hydrodynamic model to characterize flow conditions. Migrating alternate bars stabilized during the first equilibrium phase, creating bed surface sorting patterns of coarse bar tops and fine pools. During the first supply increase, the bars remained stable as the pools aggraded. During the second supply increase, the pools aggraded further, causing the boundary shear stress over the bar tops to increase until the bars gained the capacity to migrate and eventually stabilize in new locations. As aggradation occurred, the original sediment sorting patterns were preserved in the subsurface. During the degradational phase, the pools experienced incision and the bars eroded laterally, but this lateral erosion ceased when coarse sediment previously deposited during the bar‐building phase became exposed. The results suggest that if a sediment supp </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：id =“sed12399-abs-0001”xml：lang =“en”> <title type =“main” >摘要</标题> >砾石床河流通过调整下游和横流方向的床地形和粒度，可以适应沉积物供应的变化。在高供应的加密条件下，这可能导致空间不均匀的地层模式，并且在随后的降解时期期间的异质地层的形态动力学影响较差，并且尚未通过物理建模研究。进行了一个水果实验以分析通道响应，其中在两个供应增加之前在恒定的排出和沉积物供应下在砾石 - 砂混合物中开发交替杆，在两个供应下导致交替棒下面的异构地层的发育。然后将电源减少到初始供应速率，通过该自成的地层引起劣化。收集地层样品，频繁测量床形地和流动深度，其与二维流体动力学模型一起使用以表征流动条件。在第一个平衡阶段稳定稳定的替代条，创建粗杆顶部和精细池的床面分类图案。在第一次供应增加期间，随着池的侵略性，条形仍然保持稳定。在第二供应增加期间，游泳池进一步加剧，导致杆顶上的边界剪切应力增加，直到杆增加了迁移的能力并且最终稳定在新位置。随着汇聚发生，在地下保留了原始沉积物分选模式。在降解阶段期间，游泳池经历了切口，并且横向侵蚀的条形，但是当先前沉积在杆建筑阶段期间沉积的粗沉积时，这种横向腐蚀被曝光。结果表明，如果沉积物 </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-28547/'>《Sedimentology: Journal of the International Association of Sedimentologists》</a> <b style="margin: 0 2px;">|</b><span>2018年第3期</span><b style="margin: 0 2px;">|</b><span>共19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=Bankert Andrew R.&option=202" target="_blank" rel="nofollow">Bankert Andrew R.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Nelson Peter A.&option=202" target="_blank" rel="nofollow">Nelson Peter A.;</a> <a href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=Bristow Charlie&option=202" target="_blank" rel="nofollow">Bristow Charlie;</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 Civil EngineeringColorado State UniversityFort Collins CO 80523 USA;</p> <p>Department of Civil EngineeringColorado State UniversityFort Collins CO 80523 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/165.html" title="地质学">地质学;</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=Alternate bar&option=203" rel="nofollow">Alternate bar;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=flume&option=203" rel="nofollow">flume;</a> <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=gravel‐bed channel&option=203" rel="nofollow">gravel‐bed channel;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=sediment supply&option=203" rel="nofollow">sediment supply;</a> <a style="color: #3E7FEB;" href="/search.html?doctypes=4_5_6_1-0_4-0_1_2_3_7_9&sertext=stratigraphy&option=203" rel="nofollow">stratigraphy;</a> </p> <div class="translation"> 机译：替代栏;水槽;氟晶际;砾石床通道;沉积物供应;地层; </div> </li> 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rollers at relative distance, which increases/decreases with decreasing/increasing speed</a> <b>[P]</b> . <span> 外国专利：  DE202005003440U1 </span> <span> . 2005-05-19</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：先进的设备可将轧制的材料以相对距离供应给压机，具有两组矫直辊，随着速度的降低/增加而增加/减少 </span> </p> </li> </ul> </div> </div> </div> <div class="theme cardcommon" style="overflow: auto;display:none"> <h3 class="all_title" id="enpatent55">相关主题</h3> <ul id="subject"> </ul> </div> </div> </div> </div> <div class="right rightcon"> <div class="details_img cardcommon clearfix" style="margin-bottom: 10px;display:none;" > </div> </div> </div> <div id="thesis_get_original1" class="downloadBth" style="bottom: 19px;z-index: 999;" onclick="ywcd('0704024308608','4',7,2,1,'',this,24)" class="delivery" prompt="010401" title="通过人工服务将文献原文发送至邮箱" >获取原文</div> <div class="journalsub-pop-up" style="display: 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