...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >The interplay between extrinsic and intrinsic controls in determining floodplain wetland characteristics in the South African drylands
【24h】

The interplay between extrinsic and intrinsic controls in determining floodplain wetland characteristics in the South African drylands

机译：基本型和内在控制在南非旱地洪泛区湿地特征之间的相互作用

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

Controls on the characteristics of floodplain wetlands in drylands are diverse and may include extrinsic factors such as tectonic activity, lithology and climate, and intrinsic thresholds of channel change. Correct analysis of the interplay between these controls is important for assessing possible channel-floodplain responses to changing environmental conditions. Using analysis of aerial imagery, geological maps and field data, this paper investigates floodplain wetland characteristics in the Tshwane and Pienaars catchments, northern South Africa, and combines the findings with previous research to develop a new conceptual model highlighting the influence of variations in aridity on flow, sediment transport, and channel-floodplain morphology. The Tshwane-Pienaars floodplain wetlands have formed in response to a complex interplay between climatic, lithological, and intrinsic controls. In this semi-arid setting, net aggradation (alluvium >7m thick) in the wetlands is promoted by marked downstream declines in discharge and stream power that are related to transmission losses and declining downstream gradients. Consideration of the Tshwane-Pienaars wetlands in their broader catchment and regional context highlights the key influence of climate, and demonstrates how floodplain wetland characteristics vary along a subhumid to semi-arid climatic gradient. Increasing aridity tends to be associated with a reduction in the ability of rivers to maintain through-going channels and an increase in the propensity for channel breakdown and floodout formation. Understanding the interplay between climate, hydrology and geomorphology may help to anticipate and manage pathways of floodplain wetland development under future drier, more variable climates, both in South African and other drylands. Copyright (C) 2016 John Wiley & Sons, Ltd.
机译：对Drylands洪泛区湿地特征的控制是多元化的，并且可以包括构造活动，岩性和气候等外在因素，以及通道变化的内在阈值。对这些控制之间的相互作用的正确分析对于评估可能的渠道 - 洪泛区对不断变化的环境条件的反应是重要的。本文使用空中图像分析，地质地图和现场数据，研究了TSHWANE和PIENAARS集水区，南非北部的洪泛区湿地特征，并将研究结果与以前的研究相结合，开发了一种新的概念模型，突出了干燥变化的影响流动，沉积物运输和渠道 - 洪泛平原形态。 TSHWANE-PIENAARS Flocplain湿地已经形成了气候，岩性和内在控制之间的复杂相互作用。在这种半干旱的环境中，通过与传输损失和下游梯度下降相关的排放和流功率的标记下游下游下游升高，升高了湿地的净氮化（Alluvium> 7m厚）。在更广泛的集水区和区域背景下考虑Tshwane-Pienaars湿地突出了气候的关键影响，并展示了洪泛区湿地特征如何沿着柔软的气候梯度变化。随着河流维持通道的能力的降低，增加的趋势往往与河流击穿和泛洪组成的倾向增加有关。了解气候，水文和地貌之间的相互作用可能有助于预测和管理未来干燥机下洪泛区湿地发展的途径，在南非和其他旱地中的更具可变气候。版权所有（c）2016 John Wiley＆Sons，Ltd。

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