...
  • 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 >Geomorphic changes in a complex gully system measured from sequential digital elevation models, and implications for management
【24h】

Geomorphic changes in a complex gully system measured from sequential digital elevation models, and implications for management

机译：从顺序数字高程模型测量的复杂沟渠系统中的地貌变化及其对管理的影响

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

High-resolution digital elevation models (DEMs) were derived from sequential aerial photography of an active fluvio-mass movement (gully) complex in New Zealand's North Island East Coast region, to measure geomorphic changes over approximately one year. The gully showed a complex behaviour, combining fluvial and mass movement erosion, deposition, and reworking of materials stored in an active debris fan. During the measurement period 5200 ± 1700 m~3 of material were eroded from the 8.7 ha gully complex and 670 ± 180 m~3 from the 0.8 ha depositional fan, giving a total of 5870 ± 1710 m~3 for the entire gully complex-fan system. The results provide a high-resolution description of gully behaviour over a short time period, and also demonstrate that mass movement (slumping and debris flows) accounted for almost 90 per cent (4660 ± 200 m~3) of the sediment generated. This erosional response is described in terms of gully evolution by comparing the gully complex to other systems in the region in various stages of development. The effect of gully evolution on geomorphic coupling between the gully complex and channel system is described, an coupling is also shown to vary with the magnitude and frequency of rainfall events. From a land management perspective the success of strategies, such as tree planting, to mitigate against gully erosion depends on the stage of gully development-particularly on whether or not mass movement erosion has begun. In contrast to gully rehabilitation efforts elsewhere, basin-wide afforestation in the early stages of gully incision is favoured over riparian planting, given that mass movement assisted by excessive groundwater pressure is the main process leading to uncontrollable gully expansion. To protect land effectively against continuing gully erosion of headwater catchments and resulting downstream aggradation, it is necessary for land managers to understand the spatial and temporal variability of gully development fully so that mitigation efforts can be targeted appropriately.
机译：高分辨率数字高程模型（DEMs）来自新西兰北岛东海岸地区活跃的潮气运动（沟壑）综合体的连续航空摄影，用于测量大约一年的地貌变化。沟壑表现出复杂的行为，结合了河流和泥石运动的侵蚀，沉积以及对活动碎片风扇中存储的材料的返工。在测量期间，从8.7公顷的沟渠复合体中侵蚀了5200±1700 m〜3的材料，从0.8公顷的沉积扇中侵蚀了670±180 m〜3的材料，整个沟渠复合体总计为5870±1710 m〜3-风扇系统。结果提供了在短期内对沟壑行为的高分辨率描述，还证明了质量运动（塌陷和泥石流）几乎占所产生沉积物的90％（4660±200 m〜3）。通过将沟壑复杂性与该地区处于不同发展阶段的其他系统进行比较，以沟壑演变的形式描述了这种侵蚀响应。描述了沟壑演变对沟壑复杂与河道系统之间的地貌耦合的影响，耦合也随降雨事件的大小和频率而变化。从土地管理的角度来看，减轻树木侵蚀的策略（例如植树）的成功与否取决于沟壑的发展阶段，尤其取决于群众运动侵蚀是否已经开始。与其他地方的沟壑修复工作相比，沟壑切口早期的全流域造林优于河岸种植，因为由于地下水压力过大而导致的大规模移动是导致沟壑扩张失控的主要过程。为了有效保护土地免遭源头流域的沟壑持续侵蚀并导致下游集水，土地管理者有必要充分了解沟壑发展的时空变化，以便能够有针对性地进行减灾工作。

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