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首页> 外文期刊>International Journal of Environmental Impacts: Management, Mitigation and Recovery >HOW FUTURE SEA LEVEL RISE WILL AFFECT SOUTH DUNEDIN
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HOW FUTURE SEA LEVEL RISE WILL AFFECT SOUTH DUNEDIN

机译：未来的海平面上升将如何影响南达尼丁

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摘要

The southern part of Dunedin City, New Zealand, is built over an estuarine marsh, close to sea level and is vulnerable to increased flooding from raised groundwater levels, which will only worsen with predicted sea level rise. Limited data indicate that this area may also be subsiding via either sediment consolidation or tectonism. The underlying sediments amplify seismic waves with the potential to liquefy during strong earthquake shaking. Dunedin is a hazardous place to live and about 2,600 homes are less than 50 cm above mean sea level. Past mining of a dune barrier led to inundation of parts of the city and without the re-established dune barrier, this community would be unprotected. In June 2015, a moderate rainfall event caused NZD 26 million damage through flooding, primarily related to deteriorating and poorly maintained drainage infrastructure. However, the groundwater level here is near the surface (0-1 m depth) and shows tidal fluctuations, which influence the degree of flooding. Reduced storm water storage, related to the increased groundwater levels due to sea level rise, will result in more frequent flooding and of greater magnitude over time. Engineering solutions such as increased pumping capacity and creation of storage areas will be required at considerable cost and disruption to the city. There are difficult decisions to be made about the sustainability of this low-lying coastal community in terms of investment and protection or abandonment of this area. While fundamentally social and economic issues, such decisions should be informed by rigorous technical assessments and investigation and more extensive monitoring systems.
机译：新西兰达尼丁市南部,建在河口湿地,接近海平面和容易受到洪水的增加提高了地下水的水平,这只会进一步恶化与预测海平面上升。表明,该区域也可能下沉通过沉积物固结或构造作用。底层沉积物放大地震波在强烈地震液化的潜力震动。大约2600个家庭都小于50厘米以上的意思海平面。泛滥的地区的城市,没有重新建立沙丘障碍,这个社区是不受保护的。事件引起NZD造成2600万点的伤害洪水,主要是相关和恶化维护不善的排水基础设施。然而,这里的地下水位附近表面(0 - 1米深),显示了潮汐波动,影响的程度洪水。由于海平面增加地下水的水平上升,将导致更频繁的洪水和更大的规模。如增加泵送能力和解决方案需要创建的存储区域相当大的成本和中断。有困难的做出判断这地势低洼的沿海的可持续性社区的投资和保护或放弃这一领域。社会和经济问题,这样的决定被严格的技术评估和通知调查和更广泛的监控系统。

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