The Evolution of Fluvial Sediment Delivery from Asia's Rivers to the Oceans: Trends and Causes

从亚洲河流到海洋的河流沉积物输送的演变：趋势和原因

基本信息

批准号：
2574487
负责人：
金额：
--
依托单位：
University of Southampton
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2021
资助国家：
英国
起止时间：
2021 至无数据
项目状态：
未结题

来源：
https://gtr.ukri.org/projects?ref=studentship-2574487
关键词：
Evolution Fluvial Sediment Delivery Asia

项目摘要

This project aims to quantify and explain variations (1985-2020) in the discharge of fluvial sediment to the oceans, with a focus on the continent of Asia. River-borne sediments help determine the character and evolution of coastal environments. For example, the delivery of fluvial sediment to the coast affects coastal retreat and relative sea-level adjustments of the world's deltas [1]. Unfortunately, estimates of the ways in which sediment flux varies remain highly uncertain because of large biases in data availability. The issue is not that individual measurements are unreliable, but rather that such measurements are rarely made. Further, such measurements are often point samples, rather than continuous monitoring setups. Less than 10% of the world's rivers are monitored for their sediment delivery to the coastal zone, and these issues are more acute in developing nations where resources are highly pressured. Meanwhile, the Earth - and Asia in particular, which dominates the global sediment budget - is undergoing a period of unprecedented anthropogenic influence, with dam building, climate change, deforestation and agricultural practices all thought to have had a dramatic impact on the movement of water and sediment from land to sea in recent decades. These global changes are anticipated to continue, affording a clear imperative to determine the effects of these major transitions on fluvial sediment flux.

该项目旨在量化和解释河流沉积物向海洋排放的变化（1985-2020 年），重点关注亚洲大陆。河流沉积物有助于确定沿海环境的特征和演变。例如，河流沉积物向海岸输送会影响海岸退缩和世界三角洲的相对海平面调整[1]。不幸的是，由于数据可用性存在很大偏差，对沉积物通量变化方式的估计仍然高度不确定。问题不在于个别测量不可靠，而在于很少进行此类测量。此外，此类测量通常是点样本，而不是连续监测设置。世界上只有不到 10% 的河流受到向沿海地区输送沉积物的监测，这些问题在资源压力很大的发展中国家更为严重。与此同时，地球——尤其是在全球沉积物预算中占主导地位的亚洲——正在经历一个前所未有的人为影响时期，水坝建设、气候变化、森林砍伐和农业实践都被认为对水的流动产生了巨大影响。以及近几十年来从陆地到海洋的沉积物。预计这些全球变化将持续下去，因此迫切需要确定这些重大转变对河流沉积物通量的影响。