GCRF_NF332 Ongoing impacts from the surge in sand mining during COVID-19: Enhanced river bank erosion hazard and risk in Vietnam's Mekong delta

GCRF_NF332 COVID-19 期间采砂激增的持续影响：越南湄公河三角洲河岸侵蚀危害和风险加剧

• 批准号: EP/V036394/1
• 负责人: Julian Leyland
• 金额: $ 48.19万
• 依托单位: University of Southampton
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2020
• 资助国家: 英国
• 起止时间: 2020 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FV036394%2F1
• 关键词: GCRF_NF332; Ongoing; impacts; surge; sand

SE Asia's CV19 economic recovery plan is heavily reliant on an expanded construction industry, creating high demand for sand across the region. Sand is routinely mined from large rivers and is normally subject to regulation because, if it is removed more rapidly than it is replaced by river flows, it can trigger adverse socio-environmental impacts that hinder development. These include bank erosion - threatening homes and infrastructure - while over-deepened delta channels are also prone to saltwater intrusion. The Mekong delta is already experiencing these problems, but the issue highlighted here is that the CV19 'lockdown' - and potentially the recovery - has led to an upsurge in unregulated sand mining due to limitations in governance capacity. This proposal will spatially quantify this activity and predict the extent to which it will further stimulate bank erosion in the forthcoming monsoon season (when banks become saturated) and subsequent dry season (bank collapse is usually triggered during flow recession). Changes in exposed population as a result of internal migration pre- and post lockdown will also be estimated using expert knowledge verified with traffic volume changes, along with an assessment of exposed socio-economic assets (e.g., roads, schools), to establish changing spatial patterns of hazard, vulnerability and risk. This work is urgent because of concerns that CV19 related mining has primed the system for severe erosion during the impending flood season. The results will guide remediation efforts and aid efforts to promote stronger regulation of sand mining, both post CV19 and for any future disrupting events (including, but not limited to, pandemics) that could potentially stimulate an upsurge in illegal mining.

SE Asia的CV19经济复苏计划非常依赖扩大的建筑行业，从而在整个地区对沙子产生了高需求。沙子通常是从大河流中开采的，通常受到调节的约束，因为如果将其速度迅速替代，则它将造成不利的社会环境影响，从而阻碍了发展。其中包括银行侵蚀 - 威胁房屋和基础设施 - 而过度深水的​​三角洲渠道也容易受到盐水的入侵。湄公河三角洲已经在遇到这些问题，但是这里强调的问题是，由于治理能力的限制，CV19的“锁定”以及可能的恢复可能导致了不受监管的沙挖矿。该提案将在空间上量化这项活动，并预测在即将到来的季风季节（银行饱和）和随后的旱季（通常在流动衰退期间触发银行崩溃），它将进一步刺激银行侵蚀的程度。由于内部迁移前后，裸露人口的变化也将使用交通量变化验证的专家知识以及对暴露的社会经济资产（例如，道路，学校）的评估来估算，以建立不断变化的空间危害，脆弱性和风险的模式。这项工作很紧急，因为担心CV19相关的采矿已经在即将到来的洪水季节中启动了严重侵蚀的系统。结果将指导补救工作和援助努力，以促进CV19之后的更强有力的沙采矿调节，以及未来的任何破坏事件（包括但不限于大流行病），这些事件可能会刺激非法挖掘的情况。

项目成果

Monitoring riverine traffic from space: The untapped potential of remote sensing for measuring human footprint on inland waterways.

从太空监测河流交通：遥感测量内陆水道人类足迹的未开发潜力。

• DOI: 10.1016/j.scitotenv.2022.160363
• 发表时间: 2023
• 期刊: The Science of the total environment
• 作者: Smigaj M