...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Waterway, Port, Coastal and Ocean Engineering >Estimating Boat-Wake-Induced Levee Erosion using Sediment Suspension Measurements
【24h】

Estimating Boat-Wake-Induced Levee Erosion using Sediment Suspension Measurements

机译：

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

The subaqueous portion of a levee bank in the Sacramento-San Joaquin River Delta of central California was instrumented to quantify the impact of boat-generated waves. Typical erosion rates associated with recreational craft are too small for direct measure-ment of bank retreat on a per-boat-passage basis; therefore, two independent analytical methods of estimating linear erosion were developed based on colocated suspended sediment concentration and velocity time series. The algorithms were tested using data measured during a field experiment in which a 7.5 m boat was driven past the site over a range of speeds to generate waves of varying size. A cross-shore array of electromagnetic current meters and optical back-scatterance sensors measured the character of boat-generated waves and the resultant sediment suspension. In near-bank, shallow-water (d<0.5 m) locations, sediment suspension was closely correlated with the primary boat-wake waves (H_(max)<0.21 m), indicating that maximum near-bottom orbital velocities were sufficient to erode the fine-grained (mud-silt) bottom materials. Suspension events were short lived (order of 1-5 min), despite very long particle settling times (order of hours), because river currents swept the suspension plumes downstream. This implies negligible sedimentation and resuspension locally. Both algorithms produced strikingly similar erosion estimates, and these values (0.01-0.22 mm/boat passage) compare favorably with direct measurements of cumulative bank erosion in response to multiple, sequential boat passages. Field conditions for which the algorithms are appropriately applied are discussed.

著录项

相似文献

  • 外文文献
  • 中文文献
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