摘要
悬沙浓度是河口水沙环境研究中极为重要的一环,与港口、航道工程以及生态环境息息相关。近年来,随着长江流域水土保持工作的开展和大坝的兴建,径流输沙量大幅减少,长江口的水沙环境发生了显著变化。搜集了长江口近十几年来51个测点的多年连续悬沙资料,研究了新水沙形势下长江口悬沙浓度的时空分布特征。研究结果表明:长江口悬沙浓度存在明显的时空差异;在空间变化方面,横向上北支大于南支,纵向上自口内向口外则呈先增大后减小的分布特征;在年际变化方面,长江口悬沙浓度整体随着上游来沙的减小,呈波动下降趋势;在拦门沙区域,因风浪作用影响较大,悬沙浓度对各年份风速的变化存在明显的响应过程。
Suspended sediment concentration (SSC) is an extremely important in the studies of estuary flow and sediment environment, which is closely linked with port project, waterway and ecological environment. Along with lots of dams being constructed in the Yangtze River Basin in recent years, the river transport sediment decreased quite a lot and the estuarine environment changed significantly. In the light of this new condition, this study collected the SSC data at 51 stations over ten years in the Yangtze Estuary to analyze the SSC spatial and temporal distributions, and evident spatial and temporal variations were found. In space, SSCs in the north branch are generally larger than the South Branch transversely, and longitudinally SSCs firstly increase and then decrease seaward. As to the interannual changes, the SSCs in the Yangtze Estuary show a fluctuant downward trend because of the riverine sediment flux decline. In the mouth bar area, SSCs fluctuated visibly in response to the strong influences of winds and waves.
作者
杨海飞
张鹏
Haifei;ZHANG Peng(Changjiang River Estuary Bureau of Hydrological and Water Resources Survey, Changjiang Water Resources Commission, Shanghai 200136, China;Shanghai Oceanic Environmental Monitoring and Forecasting Center, Shanghai 200062, China)
出处
《人民长江》
北大核心
2019年第10期37-41,共5页
Yangtze River
基金
上海市青年科技英才扬帆计划项目(19YF1452100)
华东师范大学河口海岸学国家重点实验室开放基金资助项目(SKLEC-PGKF201904)
上海市科委项目(17DZ1204802)
关键词
悬沙浓度
时空分布
波动趋势
上游来沙
长江口
suspended sediment concentration
spatial and temporal distributions
fluctuant trend
river sediment flux
Yangtze Estuary
