Dynamic river morphology due to land use change and erosion mitigation measures in a degrading catchment in the Siwalik Hills, Nepal
Dynamic river morphology due to land use change and erosion mitigation measures in a degrading catchment in the Siwalik Hills, Nepal
复制标题
尼泊尔西瓦利克山流域退化中土地利用变化和侵蚀减缓措施导致的动态河流形态
DOI：
10.1080/15715124.2014.963860
复制
发表时间：
2014
影响因子：
2.5
通讯作者：
D.
中科院分区：
文献类型：
--
作者：
Ghimire S. and Higaki;D.
本文介绍了一项评价研究的结果，重点是土地利用和流平面形态的变化和各种形态的变化，在一个小的退化集水区的西瓦利克山在尼泊尔。该研究基于对历史航空照片（1964 - 2010年）的空间分析以及几次实地测量和观察（1998 - 2012年）。对历史航空照片的分析表明，1964年至2003年期间，由于农业用地的扩大，出现了明显的毁林现象。从航空照片和实地观察中观察到几种类型的形态变化。河道的特点是活跃的银行侵蚀的宽度增加，特别是从1964年至2003年。下游河道淤积明显，中游河道冲刷、河道加宽、活动河道横向移动。研究结果表明，土地利用的历史变化与河道形态的变化有着密切的联系，应采取相应的保护措施，以控制上游地区的泥沙供应，而上游地区是主要的泥沙来源，如滑坡和冲沟。
This paper presents findings of an evaluation study that focused on the changes in land use and stream planform and various morphological changes in a small degraded catchment of the Siwalik Hills in Nepal. The study was based on a spatial analysis of historical aerial photographs (1964–2010) and several field measurements and observations (1998–2012). Analysis of historical aerial photographs indicated that noticeable deforestation occurred during the period between 1964 and 2003 as a result of expansion of agricultural land. Several types of morphological changes were observed from both aerial photographs and field observation. The stream channels were characterized by active bank erosion with an increase in width, particularly from 1964 to 2003. There was a noticeable sediment accumulation in the lower reach, while a combination of bank erosion, channel widening and lateral movement of the active channel was observed in the middle reach. A strong link between the historical changes in land use and changes in stream channel morphology was found. It is suggested that appropriate conservation measures should be implemented to control sediment supply from the upper reaches where key sediment sources such as landslides and gullies are located.