...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Management >A Model of Navigation-Induced Currents in Inland Waterways and Implications for Juvenile Fish Displacement
【24h】

A Model of Navigation-Induced Currents in Inland Waterways and Implications for Juvenile Fish Displacement

机译：内河航道诱导水流模型及其对幼鱼移位的影响

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 likely extension of commercial inland navigation in the future could increase hazards directly impacting on the nurseries of freshwater fish, especially for smaller individuals with limited swimming abilities. One limitation of the evaluation of inland navigation on fish assemblages is the lack of suitable hydraulic models. This article presents a hydraulic model to assess the increase of navigation-induced physical forces due to higher vessel speed, length, and drought in a low-flowing waterway related to maximum swimming performance of fish to (1) foresee hazards of enhancement of inland navigation, (2) derive construction measures to minimize the hydraulic impact on small fish, and (3) improve fish recruitment in waterways. The derived model computed current velocities induced by passing commercial vessels in inland waterways experimentally verified and parameterized in a German lowland waterway. Results were linked with a model of maximum fish swimming performance to elucidate consequences for freshwater fish populations. The absolute magnitude of navigation-induced current limits the availability of littoral habitats for small fish. Typical navigation-induced current velocities of 0.7-1 m/s in the straight reaches of waterways will be maintained by fish longer than 42 mm only. Smaller juveniles unable to withstand those currents could become washed out, injured, or displaced. In contrast, in small local bays, the navigation-induced current declined significantly. According to our model, in a 20-m extended bay, the return current drops below 0.11 m/s, corresponding to the maximum swimming speed of a 9-mm-long fish. Thus, enhancing shoreline development by connecting oxbows, tributaries, and especially by purpose-built bays limits the impact on fish recruitment without restricting navigation resulting in more precautionary and sustainable inland navigation.
机译：未来商业内陆航行的可能扩展可能会增加危害，直接影响淡水鱼的苗圃，特别是对于游泳能力有限的较小个体。鱼类组合内陆航行评估的局限之一是缺乏合适的水力模型。本文提出了一种水力模型，用于评估由于低流速水道中较高的船只速度，长度和干旱而引起的航行诱导的物理力的增加，这与鱼的最大游泳性能有关，以（1）预见到加强内陆航行的危害，（2）提出施工措施，以最小化对小鱼的水力影响，（3）改善水道中的鱼群。该推导模型计算了在德国低地水道中经过实验验证和参数化的通过内河水道中的商用船所引起的流速。将结果与最大鱼类游动性能模型相联系，以阐明对淡水鱼类种群的影响。航行感应电流的绝对大小限制了小鱼沿岸栖息地的可用性。只有长度超过42毫米的鱼才能维持在航道直段典型的航行诱导的流速0.7-1 m / s。无法承受这些潮流的较小的少年可能会被冲走，受伤或流离失所。相反，在较小的局部海湾中，导航引起的电流显着下降。根据我们的模型，在20米长的海湾中，返回电流降至0.11 m / s以下，这对应于一条9毫米长的鱼类的最大游泳速度。因此，通过连接牛，支流，特别是通过专用海湾来增强海岸线的发展，在不限制航行的情况下限制了对鱼类招募的影响，从而带来了更加预防和可持续的内陆航行。

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