• 主题
高级搜索  >
历史搜索 清空历史
首页> 美国政府科技报告 >Ashtabula River, Ohio, Sedimentation Study Report 1, Field and Numerical Model Investigations of Channel Scour; 1994 Interim Results
【24h】

Ashtabula River, Ohio, Sedimentation Study Report 1, Field and Numerical Model Investigations of Channel Scour; 1994 Interim Results

机译：俄亥俄州阿什塔布拉河，沉积研究报告1，河道冲刷的田间和数值模型研究; 1994年中期业绩

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A field data collection effort was initiated on 4 June 1994 to monitor water-level fluctuations, suspended sediment concentrations, and bottom material sampling for sediment classification. Water level fluctuations, at 15- min sampling intervals, were obtained at four locations using continuous recording water level sensors. Water samples, obtained during a significant water level rise, were collected using float activated automatic water samplers. Bottom material samples were obtained using two types of sampling devices. A 6- in. box core sampler, for collecting undisturbed samples, and a push core sampler, for collecting samples for sub sectioning, were the devices used. River current measurements were performed at four data collection ranges. Acoustic Doppler Current Profile (ADCP) equipment were used to obtain the velocity data. Monthly service trips were scheduled to perform maintenance and data retrieval on the longterm equipment. Preliminary data analysis of velocity profiles indicated the velocity range was 0 - 30 cm/sec. Laboratory erosion tests indicated the critical shear stress for commencement of surface erosion between 0.2 - 0.6 Pa. A preliminary TABS-MD finite element modeling system was developed to provide multidimensional solutions to open-channel flow and sediment transport problems. Finite element meshes were developed using National Oceanic and Atmospheric Administration (NOAA) survey chart of the area and recent hydrographic survey data collected by the U.S. Army Engineer District, Detroit. Typical mesh element size was 120 m (400 ft) longitudinally and 18 m (60 ft) laterally.

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