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- Title
湖南东江湖水库消落带地形因子与 水文要素时空格局变化.
- Authors
刘春香; 黄紫乐; 谭博文; 李有志
- Abstract
Ecological restoration of the hydro-fluctuation belt in the Dongjiang Lake is important because of the increasing risk of riverbank erosion and water-soil loss. As the most critical factors for the restoration of the hydro-fluctuation belt of lakes and reservoirs, topographic and hydrological factors best describe the basic state of such an ecosystem. In this study, digital elevation model (DEM) data of the Dongjiang Lake Basin and daily water level data (2017-2022) from hydrological stations were collected. The range of the hydro-fluctuation belt was extracted using ArcGIS, and then the changes in spatiotemporal pattern of the topographic and hydrological factors in the hydro-fluctuation belt were analyzed.The study produced the following findings. (1) The hydro-fluctuation belt in the Dongjiang Lake was located at an elevation of 263-278 m, a vertical elevation difference of 15 m, and had a total area of 25.16 km². The elevations and slopes in the belt had the highest values in the northern and southern areas (e.g., Chukou Town, Huangcao Town) and the lowest in the middle area (e.g., Bailang Town, Xiaodongjiang) . The non-slope aspect in the belt was widely distributed, and the area of shady slope exceeded that of sunny slope. Long and short slopes were mainly located in the northern and southern areas of the belt, respectively. The profile curvature and plane curvature in the belt showed the same change trend in spatial distribution, exhibiting low values in the northern and southern belts and high values in the middle belt. (2) The topographic and hydrological factors in the hydro-fluctuation belt in the Dongjiang Lake were spatially heterogeneous. The annual, minimum continuous, and average continuous flooding days as well as the maximum and average flooding depths in the hydro-fluctuation belt showed significant negative correlations with elevation. (3) It should be considered for comprehensive control of the hydro-fluctuation belt at Bailang Town, Xingning Town, Pingshi Town, and Xiaodongjiang. Comprehensive control will be difficult in Chukou Town and Huangcao Town. The section L of the belt at elevation ranging from 263 to 266 m was a perennial flooding area and was not suitable for habitat of vegetation, and that ranging from 266 to 278 m was an accidental flooding area that was suitable for some vegetation restoration. This study provides a scientific basis for plant community establishment, ecological restoration, and comprehensive management of the hydro-fluctuation belt in the Dongjiang Lake.
- Publication
Mountain Research (10082786), 2023, Vol 41, Issue 5, p676
- ISSN
1008-2786
- Publication type
Article
- DOI
10.16089/j.cnki.1008-2786.000779