• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>2010 IEEE/OES US/EU Baltic International Symposium >Operational observations methods during offshore sand mining — case study in Tallinn Bay, the southern Gulf of Finland
【24h】

Operational observations methods during offshore sand mining — case study in Tallinn Bay, the southern Gulf of Finland

机译：近海采砂过程中的操作观测方法-以芬兰南部海湾塔林湾为例

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

摘要

Offshore sand mining is increasing activity nowadays. Environmental impact of sand mining appears usually through the transport of suspended particulate matter (SPM) away from the actual mining area. Satellite remote sensing is efficient tool for the operational monitoring of SPM distribution during harbor dredging, but problematic in the case of sand mining, as SPM remains mainly below the water surface. We used satellite remote sensing, in-situ measurements of optical properties of seawater and combined wave, hydrodynamic and sediment transport numerical modeling for assessment of the area affected by sand mining in Tallinn Bay, the southern Gulf of Finland. Sand mining took place from October 2008 to April 2009 with short breaks that were random in time. Vertical profiles of spectral attenuation and absorption coefficients by spectrometer AC Spectra, underwater light field and albedo by radiometer Ramses-ACC-VIS were measured in situ. In satellite remote sensing MODIS images with 250 m spatial resolution were used for the qualitative estimation of the surface area that was affected by sand mining. Nested 2D hydrodynamic model and wave model SWAN with 400 m spatial resolution at mining site gave input fields of currents and bottom shear stresses to the Lagrangian type particle transport model. While in-situ measurements and satellite remote sensing give snapshot about the SPM distribution numerical modeling enables to have dynamics of the ongoing process. In-situ measurements showed that the concentrations of SPM were the highest at the mining operation. The thickness of the elevated SPM layer was about 6 m. Satellite remote sensing showed minor or no signal of elevated SPM concentrations on the water surface in comparison to surrounding area. Model result show clearly that eastward transport of SPM prevailed during the sand mining activities. The SPM covered larger area during autumn than during winter and spring. This can be attributed to the stronger winds that-- forced higher waves and stronger currents. Wave activity is responsible for keeping the SPM in suspension, which favors the transport of SPM away from the mining site. In the environmental point of view, the most affected area remains in the radius of 1 km from the mining site. In conclusion, the use of satellite remote sensing and in-situ measurements can be misleading when considering environmental impact assessment caused by SPM.
机译：离岸沙坑正在增加活动。沙坑的环境影响通常通过悬浮的颗粒物（SPM）远离实际采矿区。卫星遥感是港口疏浚过程中SPM分布操作监测的有效工具，但在沙坑的情况下有问题，因为SPM主要在水面下方。我们采用卫星遥感，原位测量海水和沉积波，流体动力学和沉积物运输数值模型，评估芬兰南部塔林湾受沙坑影响的地区。沙坑从2008年10月至2009年4月发生，短休息时间是随机的。通过光谱仪AC光谱，水下光场和Albedo通过辐射计Ramses-ACC-VI的垂直剖视图通过光谱仪AC光谱，水下光场和Albedo进行测量。在卫星遥感MODIS图像中，使用250米的空间分辨率用于由沙坑影响的表面积的定性估计。嵌套2D流体动力学模型和波模型，采用400米空间分辨率，采用400米的空间分辨率给了拉格朗日型粒子传输模型的电流输入电流和底部剪切应力。虽然原位测量和卫星遥感给出了关于SPM分布数值模型的快照，可以具有正在进行的过程的动态。原位测量表明，SPM的浓度是在采矿操作中最高的。升高的SPM层的厚度约为6μm。与周围区域相比，卫星遥感显示水面上升高的SPM浓度的次要或没有信号。模型结果明显显示沙坑活动期间SPM的东方运输普遍存在。 SPM在秋天和春天和春天期间覆盖了较大的区域。这可以归因于更强的风 - - 强制较高的波浪和强烈的电流。波浪活动负责将SPM保持在悬架中，这使得SPM运输远离采矿部位。在环境观点来看，矿业地区最受影响的地区仍然是距离矿业1公里的半径。总之，在考虑由SPM引起的环境影响评估时，卫星遥感和原位测量的使用可能是误导性的。

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