摘要
侵蚀基准面变化是河床演变的重要边界条件,直接影响鄱阳湖流域的水文地貌变化。分析鄱阳湖湖口河床最低点高程后发现近期鄱阳湖流域侵蚀基准面呈下降趋势,且主要受三峡大坝工程的影响。利用多波束测深系统与三维激光扫描仪对鄱阳湖星子镇沙岭岸滩剖面开展水陆一体化的地形地貌测量。测量结果表明:侵蚀基准面下降引起枯季水位迅速消落、枯期提前以及入江通道湖床冲刷;岸滩高程超过一级阶地时,高程值越大,沉积物粒径越细;湖口泥沙出湖速率增加,加大泥沙的输出量,从而改变了鄱阳湖的泥沙收支平衡。
The base level of scour has been proved as an important boundary condition for riverbed processes,which directly affects the hydrology and geomorphology of Poyang Lake Basin.Based on the analysis of the lowest elevation of the riverbed at Hukou Station of Poyang Lake Basin,the local base level of scour in this area is declining recently,which is mainly contributed by the Three Gorges Project(TGP).An integrated geomorphological measurement of land and water has conducted at the profile of Shaling shoreline in Xingzi Town through multi beam bathymetric system and three-dimensional laser scanner.The results indicate that the decline of the base level of scour has brought about lower water level,rapid drop in dry season,early dry season,and the scour of the lakebed of the channel into the Yangtze River.When the upper level of the shoal exceeds the first terrace,the higher the level is,the finer the grain size of sediment is.The increased outflow rate of sediment at the Hukou Station has caused the huge loss of sediment,and is changing the sediment balance of Poyang Lake.
作者
向诗月
程和琴
滕立志
XIANG Shi-yue;CHENG He-qin;TENG Li-zhi(State Key Laboratory of Estuarine and Coastal Research,East China Normal University,Shanghai 200241,China;Institute of Eco-Chongming(IEC),Shanghai 202150,China)
出处
《泥沙研究》
CAS
CSCD
北大核心
2021年第5期48-54,共7页
Journal of Sediment Research
基金
国家自然科学基金委(NSFC)与荷兰科学研究组织(NWO)、英国研究理事会(RCUK)合作研究项目(51761135023)。
关键词
鄱阳湖
侵蚀基准面
岸滩剖面
泥沙收支平衡
Poyang Lake
base level of scour
nearshore profile
sediment budget
