Collaborative Research: The Origin of Natural Levees

9811860 Slingerland本研究将探讨冲积洪泛区天然堤坝的起源、演变形态和沉积学特征，集中于不列颠哥伦比亚省戈尔登附近的上哥伦比亚河和萨斯喀彻温省东部坎伯兰沼泽的萨斯喀彻温河。 尽管堤坝通常被认为是相对简单的特征，但它们相当复杂，显示出各种各样的尺寸、形状、坡度和纹理属性，这些属性可能反映了对河道和洪泛区配置、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）测量和分析堤坝的形态参数，（2）现代堤坝形成的水力场测量和数学建模，（3）堤坝沉积物的沉积学调查，重点是从沉积物中可以推断出河道历史和堤坝演化模式的问题。 该项目的结果预计将（i）允许测试天然堤坝的发展和增长的拟议概念模型，同时在河流漫滩中发生撕裂后的河道演变，（ii）提供一个更清晰的感觉，在堤坝发展的不同阶段，河道到漫滩沉积物转移的扩散和adjective机制的相对重要性，和（iii）导致更好地了解堤坝沉积及其在冲积沉积物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.