Deciphering the evolutionary history and depositional processes of meandering rivers

破译蜿蜒河流的演化历史和沉积过程

基本信息

批准号：
RGPIN-2018-06026
负责人：
Durkin, Paul
金额：
$ 1.82万
依托单位：
University of Manitoba
依托单位国家：
加拿大
项目类别：
Discovery Grants Program - Individual
财政年份：
2019
资助国家：
加拿大
起止时间：
2019-01-01 至 2020-12-31
项目状态：
已结题

来源：
https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=680423
关键词：
Deciphering evolutionary history depositional processes

项目摘要

Rivers are essential aspects of transport systems that deliver sediment from erosional highlands to depositional basins. Rivers also play a significant role in society, from irrigation and navigation, to wildlife habitat and sources of drinking water. Drastic changes in river system behavior can also significantly impact infrastructure and human lives (e.g., floods). There is considerable uncertainty in predictions of the magnitude and frequency of future flood events and how river systems will respond to environmental change. Investigation into the deposits of past floods and the evolutionary history of river systems provides insight into these uncertainties. By documenting ongoing processes in modern river systems, we learn how and under what conditions sediment is deposited, and define criteria for recognition of associated sediments in the depositional record. The proposed research program aims to better understand how rivers respond to internal (e.g., floods) and external (e.g., climate) forcing by studying the processes of modern rivers, and their resulting deposits in the fossilized record.***The surficial sediment cover of southwestern Manitoba records the de-glaciation history of the area, beginning around 20,000 years ago. This includes the deposition of the Assiniboine Delta into glacial Lake Agassiz, which once covered much of the province. As the lake drained, fluvial incision into the deltaic deposits created the modern Assiniboine River valley. It is within these river deposits that an archive of past floods, changing lake levels, and varying climatic conditions is recorded. The proposed research program will investigate these deposits to yield insight into the magnitude and frequency of flood events, and more generally, how rivers respond to changing Earth conditions. To expand the window of observation, fossilized river deposits exposed in the “badlands” of southeastern Alberta will also be examined. Ancient fluvial deposits are an underutilized record of changing Earth conditions, and they represent a much longer archive (>104 yrs) than human observation. This integrated analysis will provide a holistic understanding of river processes and sedimentary products, which will inform predictions of future flood events and river response to a changing climate. The proposed research program will train 14 HQPs and produce results that are directly applicable to flood mitigation efforts, as well as the development of oil and gas resources contained in fluvial deposits.

河流是从侵蚀的高地到社会中的沉积物，到野生动植物栖息地和饮用水的来源。洪水事件和河流系统将如何应对过去洪水沉积物的投资，而河流系统的进化产生了对现代河流系统中的sesssss的见解，我们了解如何沉积和在哪些条件下沉积的条件，并定义了识别的标准沉积物中的相关沉积物对内部（例如洪水）和外部（例如，气候）的反应。大约在20，000年前。并记录了各种气候内容。与人类的观察相比，它们代表了更长的档案（> 104年）。河流沉积中包含的气体资源。