文献知网节
  • 记笔记

THE MORPHOLOGICAL, ENVIRONMENTAL CHANGES AND STABILITY OF THE SEA AND RIYERBEDS LINKED WITH HARBOUR DREDGING

K.Chandrasekaran NAIRThresiamma JOSEPHJoseph Sebastian PAIMPILLILvsnl.com

Regional Center, National Institute of Oceanography, Cochin 14, IndiaEnvirosolutions, 37/1387, Kaloor-Kadavanthara Road, Cochin 17, India. Email daj

摘要:<正>Enormous amount of mud and sand are dredged out to maintain the outer channel as a passage for large vessels to Kochi (South west India) port. The mud and sand dredged out is eventually dumped at the extreme northern and southem ends of the channel, used as dumping grounds. For a proposed oil terminal, the channel have to be dredged at lest another five meters, raising the amount dredged from 11 million cubic meters to an alarming (25 - 30) million m3. The morphological changes and stability of the sea and riverbeds were studied at 44 stations in and around Kochi harbor, covering an area of 13 km2 of estuarine and near shore areas (including the proposed dredge spoil dumping sites). Benthos serve as sensitive indicators of long-term effects or short-term perturbations either natural or man-made. The physical removal of incumbent population along with dredge spoil, the fauna will be exposed to new substratum and to changes in the nature of substratum. The study showed that dredging resulted in a decrease of population density. The recovery of the total numbers of individuals was faster than that of total number of species. The diversity of species was considerably high. Only few polychaete species were replaced by some other species. This might be due to slight variation in the environmental factors and food resources. The fauna seemed to be exposed to new temporary substrata having the same sediment characteristics holding high organic content. The 5 decades of dredging has not shown any signs of serious impairment. The present and proposed dredging and dumping areas are comparable in environmental and sediment characteristics - the envisaged increase in the quantum of material dredged and disposed is unlikely to cause detrimental environmental changes in the harbor and near shore regions.
会议名称:

第九次河流泥沙国际学术大会

会议时间:

2004-10

会议地点:

Yichang, China

  • 专辑:

    理工B(化学化工冶金环境矿业); 理工C(机电航空交通水利建筑能源)

  • 专题:

    环境科学与资源利用

  • 分类号:

    X171

  • 手机阅读
    即刻使用手机阅读
    第一步

    扫描二维码下载

    "移动知网-全球学术快报"客户端

    第二步

    打开“全球学术快报”

    点击首页左上角的扫描图标

    第三步

    扫描二维码

    手机同步阅读本篇文献

  • CAJ下载
  • PDF下载

下载手机APP用APP扫此码同步阅读该篇文章

下载:8 页码:190-195 页数:6 大小:439k

相关推荐
  • 相似文献
  • 读者推荐
  • 相关基金文献
  • 关联作者
  • 相关视频