• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Canadian Water Resources Journal >Floods and water quality in Canada: A review of the interactions with urbanization, agriculture and forestry
【24h】

Floods and water quality in Canada: A review of the interactions with urbanization, agriculture and forestry

机译：加拿大的洪水和水质：与城市化，农业和林业的相互作用的回顾

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

Water quality remains a major issue in Canada. This paper reviews recent research on the impacts of urbanization, agriculture and forestry on water quality in Canada. Specific water quality issues such as mining, sewage treatment and waste treatment are not included in this paper. For each land use, a brief summary of the dominant processes linking runoff to water quality is provided and recent findings are summarized. With respect to urbanized watersheds, the relatively large proportion of impervious areas, lower vegetation cover and the presence of high-density drainage systems alter surface water routing and timing of peak flows. High concentrations of heavy metals are considered to be the most important water quality problem in urban runoff, but nutrients, pathogens, concentration of pharmaceuticals and water temperature also often contribute. In watersheds dominated by agricultural activities, overland flow is an important vector of pollutants, but subsurface flow such as macropore and tile-drain flows also play a role in the alteration of water quality during or after high runoff events. Nutrients, pesticides, pathogens and sediments remain important topics of research in agricultural watersheds, and the modelling effort has significantly increased in the last few decades. Beneficial management practices (BMPs) are being tested and applied at a local scale, mostly on experimental watersheds. Forestry-related activities also affect water quality. In forested watersheds, studies have been ongoing for many decades, but have decreased in intensity in the last 15 years. Sediment delivery and water temperature can be strongly affected in watersheds with significant clear-cut logging and riparian buffer strips and sylviculture remain the main mitigation BMPs. There is a need for an increase in the monitoring effort for most water quality variables in Canada. The authors recommend that flow-dependent monitoring frameworks should be further developed and implemented in the future.
机译：水质仍然是加拿大的主要问题。本文回顾了有关加拿大城市化，农业和林业对水质影响的最新研究。本文不包括采矿，污水处理和废物处理等特定的水质问题。对于每种土地利用，都简要介绍了径流与水质相关的主要过程，并总结了最近的发现。关于城市化集水区，相对较大的不透水区域，较低的植被覆盖度和高密度排水系统的存在改变了地表水的路线和洪峰流量的时间。高浓度的重金属被认为是城市径流中最重要的水质问题，但营养素，病原体，药物浓度和水温也经常造成影响。在以农业活动为主的流域中，陆上径流是污染物的重要载体，但是地下径流（例如大孔和瓷砖排水流）在高径流事件发生期间或之后，也对水质的变化发挥了作用。营养，农药，病原体和沉积物仍然是农业流域研究的重要课题，并且在过去的几十年中，建模工作已大大增加。有益管理措施（BMP）正在局部地区进行测试和应用，主要是在实验流域上。与林业有关的活动也会影响水质。在森林流域，研究已经进行了数十年，但在最近的15年中强度有所下降。流域的泥沙输送和水温可能受到严重影响，因为大量的清晰伐木和河岸缓冲带和营林仍是主要的缓解措施。在加拿大，有必要加大对大多数水质变量的监测力度。作者建议未来应进一步开发和实施与流量相关的监视框架。

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