...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Natural hazards and earth system sciences >Decadal trends in beach morphology on the east coast of South Africa and likely causative factors
【24h】

Decadal trends in beach morphology on the east coast of South Africa and likely causative factors

机译：南非东海岸海滩形态的年代际趋势及其可能的致病因素

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Sandy shorelines are dynamic with constant changes that can cause hazards in developed areas. The causes of change may be either natural or anthropogenic. This paper evaluates evidence for shoreline changes and their causative factors using a case study on the east coast of South Africa. Beach morphology trends were found to be location-specific, but overall the beaches show a receding trend. It was hypothesized that wave, tide, sea level and wind trends as well as anthropogenic influences are causative factors, and their contributions to shoreline changes were evaluated. Maximum significant wave heights, average wave direction, peak period and storm event frequencies all show weak increasing trends, but only the increases in peak period and wave direction are statistically significant. The chronic beach erosion cannot be attributed to wave climate changes since they are still too small to explain the observations. Instead, the impacts of sea level rise and reductions in the supply of beach sediments are suggested as the main causative factors. The analysis also identifies a trend in the frequency of severe erosion events due to storms that coincide with a 4.5-yr extreme tide cycle, which demonstrates the potential impact of future sea level rise.
机译：沙质海岸线是动态的，不断变化，可能在发达地区造成危险。变化的原因可能是自然的，也可能是人为的。本文以南非东海岸为例，评估海岸线变化及其成因的证据。发现海滩形态趋势是特定于位置的，但总体而言海滩呈下降趋势。假设波浪，潮汐，海平面和风向以及人为影响是致病因素，并评估了它们对海岸线变化的贡献。最大有效波高，平均波向，高峰时段和暴风雨事件频率都显示出微弱的增长趋势，但是只有峰值时段和波向的增加才具有统计意义。长期的海滩侵蚀不能归因于波涛气候变化，因为它们仍然太小而无法解释观测结果。相反，建议将海平面上升和海滩沉积物供应减少的影响作为主要诱因。该分析还确定了与4.5年极端潮汐周期一致的暴风雨引起的严重侵蚀事件的频率趋势，这表明了未来海平面上升的潜在影响。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号