SIGNIFICANCE OF SHOREFACE NOURISHMENT TO COASTAL CONSERVATION IN NOORDWIJK，THE NETHERLANDS
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摘要:
水下抛沙养滩可以通过消减波能和持续向海滩供沙，以抵御海岸侵蚀，保持海滩稳定。荷兰诺德维克(Noordwijk)地区以发育水下双坝地形为特征，为了维护海滩和海岸的稳定，自1998年开始，共实施了3次水下养滩(1998、2002和2006年)，抛沙位置都选在外沙坝的向海侧，接近当地闭合深度。养滩减缓了沙坝向海迁移的速率，内、外沙坝均出现了向岸迁移的趋势并基本保持稳定，对海岸线位置变化具有积极影响。我国目前的海滩养护工程多为向陆上滩面抛沙养滩，这种方法较昂贵、破坏性大，效果有时不佳，而水下抛沙养滩经济实惠、对环境影响小且灵活，因此，应该充分借鉴水下抛沙养滩的成功经验。基于诺德维克地区数十年的Argus视频图像和水深调查对养滩效果进行了研究和分析，总结了水下养滩的意义，以丰富和推动我国养滩业的发展。
Abstract:In order to ensure the stability of the beach and coast, three times of shoreface nourishments(1998, 2002 and 2006) have been launched in the Noordwijk, the Netherlands. There are double subtidal bars developed in the study area. For three times, sands are nourished on the seaward side of the outer bar, which is close to the local closure depth. The shoreface nourishment reduced seaward migration rates of the bar. Both the inner and outer bars show a trend of onshore migration and remain stable，which has a positive effect on the shoreline stability. Facts prove that shoreface nourishment may resist against coastal erosion and keep the beach stable by increasing wave dissipation and keeping the nourished sands moving onshore. At present, most of the beach protection projects in China are dominated by beach nourishment, which are economically expensive, environmentally destructive and ineffective, while the shoreface nourishment has the advantages of economy, small impact on the environment and flexibility. We should make full use of the successful experience of shoreface nourishment. In this paper the effects of shoreface nourishments of Noordwijk is studied and analyzed based on Argus video images and bathymetric data. And the significance of shoreface nourishment is summarized to enrich and promote the development of coastal management.
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Key words:
- shoreface nourishment /
- two-subtidal bars /
- Argus video images /
- costal stability
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