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首页> 外文会议>2007 IYRF;International Yellow River Forum on Sustainable Water Resources Management and Delta Ecosystem Maintenance >Thesen Islands: Innovative Environmental Advancements Marina Development
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Thesen Islands: Innovative Environmental Advancements Marina Development

机译：Thesen Islands：创新的环境进步滨海开发

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Thesen Islands development is an ambitious and technically complicated project where the 96-hectare Thesen Island in Knysna, South Africa, is master planned into an estate of 19 islands surrounded by wide tidal waterways linked by bridges. Fifteen kilometres of pristine water front property needs to be protected in the most environmentally friendly way possible against the erosive forces of fluctuating tide levels and associated wave action to ensure that the islands will be developed in harmony with the Knysna Estuary environment. After thorough site trials and investigations, hexagonal woven mesh products: Reno mattresses; gabions and Terramesh? were found to be the only alternative in achieving the onerous standards and criteria as set out in the project specifications, i. e. environmental compliance, durability under aggressive marine environments, ease of installation and vegetation establishment, and cost effectiveness. The chosen solution is able to protect each idyllic island against scour arising from inter tidal action and can also ensure the stability of the bank especially under rapid draw down conditions. As a result, the tidal flow around the islands is completely natural with excellent circulation, water quality and minimal silting. A state of the art modelling system developed by The Danish Hydraulic Institute was used to assist with the design and layout of the waterways. Hydraulic and hydrological modelling, which even accounts for climate change, should ensure that the Islands are completely safe from flooding. A bioengineering approach is being taken to the construction. Indigenous salt marsh plants are being used in conjunction with the inert materials in the inter-tidal zone. Small fish and marine life find food and shelter in the plants and natural rock along the edges of the waterways, which in turn, attract a diversity of birds and larger fish resulting in habitat improvement. The rock filled gabions provide surfaces for growth of algal-microbial films, which may contribute to nitrogen and phosphorus uptake from the tidal flow, thus reducing phytoplankton growth potential in the canals. The Deputy Minister of Environmental Affairs and Tourism, Minister Ms. R. T. Mabudahfhasi has commended the developers "for the most responsible manner in which they conducted, supported and financed the environmental research, which probably represents the most comprehensive, professional and detailed Environmental Impact Assessment ever undertaken in South Africa".
机译：森森群岛的开发是一项雄心勃勃且技术复杂的项目，其中，位于南非克尼斯纳的占地96公顷的森森岛总体规划为19个岛屿的庄园，周围环绕着由桥梁相连的宽泛的潮汐水道。需要以最环保的方式保护十五公里的原始水岸财产，以抵御潮汐涨落和相关的波浪作用所产生的侵蚀力，以确保这些岛屿的发展与克尼斯纳河口环境协调一致。经过全面的现场试验和调查后，六角形网眼编织产品：里诺床垫;石笼网和Terramesh？被发现是达到项目规范中规定的苛刻标准和标准的唯一替代方法，即e。符合环境要求，在恶劣的海洋环境下具有耐久性，易于安装和建立植被以及具有成本效益。选择的解决方案能够保护每个田园岛免受潮间作用引起的冲刷，并且还可以确保堤岸的稳定性，特别是在快速取水条件下。结果，岛屿周围的潮汐流是完全自然的，具有出色的环流，水质和最小的淤积。由丹麦水利学会开发的最先进的建模系统用于协助水道的设计和布局。甚至考虑到气候变化的水力学模型和水文模型应确保该群岛完全免受洪水侵害。正在采用生物工程方法进行施工。在潮间带，当地的盐沼植物与惰性材料一起被使用。小鱼和海洋生物在水道边缘的植物和天然岩石中找到食物和庇护所，进而吸引了多种鸟类和大鱼，从而改善了栖息地。岩石堆砌的石笼网为藻类微生物膜的生长提供了表面，藻类微生物膜可能会促进潮汐流中氮和磷的吸收，从而降低运河中浮游植物的生长潜力。环境事务和旅游部副部长RT Mabudahfhasi女士赞扬开发商“以最负责任的方式进行，支持和资助了环境研究，这可能代表了有史以来最全面，最专业，最详细的环境影响评估在南非进行”。

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