Collaborative Research: The Origin of Natural Levees

这项研究将研究冲积洪泛区天然堤坝的起源、演变、形态和沉积学特征，主要集中在不列颠哥伦比亚省戈尔登附近的哥伦比亚河上游和萨斯喀彻温省东部坎伯兰沼泽的萨斯喀彻温河。尽管常见的堤防描述相对简单，但它们相当复杂，显示了广泛的大小、形状、坡度和纹理属性，这些属性可能反映了对河道和泛滥平原配置、河道历史、泥沙负荷、洪水特征和洪水历史的控制。这三个部分的调查将包括(1)堤防形态参数的测量和分析，(2)现代堤防形成的水力测量和数学模拟，(3)堤防沉积物的沉积学调查，重点是从河床历史和堤防演变模式中可以推断出什么的问题。预计该项目的成果将：(I)在河流泛滥平原被撕裂后，同时对天然堤防的发展和增长与河道演变的拟议概念模型进行测试；(Ii)使人们更清楚地认识到在堤防发展的不同阶段，河道到滩地泥沙迁移的扩散和形容词机制的相对重要性；以及(Iii)使人们更好地了解堤防沉积及其在冲积沉积序列中的相对重要性。

9811860SlingerlandThis study will examine the origin, evolution morphological and sedimentological characteristics of natural levees in alluvial floodplains, concentrating on the upper Columbia River near Golden, British Columbia, and the Saskatchewan River at the Cumberland Marshes, eastern Saskatchewan. Despite common depictions of levees as being relatively simple features, they are quite complex, displaying a wide range of sizes, shapes, slopes, and textural attributes that likely reflect controls of channel and floodplain configurations, channel history, sediment load, flood character and flood history. This three-part investigation will include (1) measurement and analysis of morphometric parameters of levees, (2) hydraulic field measurements and mathematical modeling of modern levee formation, and (3) sedimentological investigations of levee deposits, focusing on the question of what can be inferred about channel history and evolutionary patterns of levees from their deposits. The results of this project are expected to (i) permit testing of a proposed conceptual model for the development and growth of natural levees concurrently with the evolution of channels following avulsion in river floodplains, (ii) provide a clearer sense of the relative importance of diffusive and adjective mechanisms of channel-to-floodplain sediment transfer during different stages of levee development, and (iii) result in a better understanding of levee deposits and their relative importance in successions of alluvial sediments.