Collaborative Research: The Origin of Natural Levees

合作研究：天然堤坝的起源

• 批准号: 9811861
• 负责人: Norman Smith
• 金额: $ 8.34万
• 依托单位: University of Nebraska-Lincoln
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-03-01 至 2003-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9811861&HistoricalAwards=false
• 关键词: Collaborative; Research; Origin; Natural; Levees

9811861SmithThis 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.

9811861Smith这项研究将研究冲积洪泛区天然堤坝的起源、演化形态和沉积学特征，重点关注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。 尽管通常对堤坝的描述是相对简单的特征，但它们相当复杂，显示出各种尺寸、形状、坡度和纹理属性，可能反映了对河道和漫滩配置、河道历史、沉积物负荷、洪水特征和洪水的控制历史。 这项由三部分组成的调查将包括（1）堤坝形态参数的测量和分析，（2）现代堤坝形成的水力场测量和数学建模，以及（3）堤坝沉积物的沉积学调查，重点关注以下问题：从沉积物中推断出河道历史和堤坝的演化模式。 该项目的结果预计将（i）允许测试拟议的概念模型，该模型用于自然堤坝的发展和增长，同时伴随着河流洪泛区撕脱后河道的演变，（ii）提供对自然堤坝的相对重要性的更清晰认识。在堤坝发育的不同阶段，河道到洪泛区沉积物转移的扩散和形容机制，以及（iii）有助于更好地了解堤坝沉积物及其在冲积沉积物演替中的相对重要性。