Behavior of Suspended Sediment in the Changjiang Estuary in Response to Reduction in River Sediment Supply

被引:9
|
作者
Zhu, Wenwu [1 ,2 ]
Li, Jiufa [1 ]
Sanford, Lawrence P. [2 ]
机构
[1] E China Normal Univ, State Key Lab Estuarine & Coastal Res, Shanghai 200062, Peoples R China
[2] Univ Maryland, Ctr Environm Sci, Horn Point Lab, Cambridge, MD 21613 USA
基金
美国国家科学基金会;
关键词
Suspended sediment concentration; Sediment resuspension; River sediment reduction; Three Gorges Dam; Changjiang estuary; YANGTZE-RIVER; NILE DELTA; DEPOSITION; TRANSPORT; EROSION; IMPACT; FLUX;
D O I
10.1007/s12237-014-9929-8
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The Changjiang river sediment supply has decreased dramatically since 2003 when the Three Gorges Dam (TGD) began operation. Annually repeated cruises were conducted in the Changjiang estuary between 2002 and 2011 to examine the behavior of suspended sediment in response to the reduction in river sediment supply. Changes in the Changjiang estuary were not as clear as in the river and showed spatial and temporal variations. Generally, the suspended sediment concentration (SSC) in different channels showed different change characteristics. In the South Branch, furthest upstream, SSC showed no obvious changes for several years after the TGD started to operate in 2003 but then has been decreasing since 2009. In the South Channel, further downstream, SSC showed no obvious responses to the reduction of river sediment supply as of 2011. In the North Channel, SSC seems to have been decreasing slightly in recent years, though not as obviously as in the South Branch. Tidal resuspension contributed to temporal variability in SSC significantly and increased relatively at all stations. Vertical variations in particle size and texture in the South Branch in 2011 indicated very active exchange between the bed and the water column throughout a tidal cycle. The primary response of suspended sediment in the upper Changjiang estuary to the closing of the TGD in 2003 seems to be a lagged decrease in the fine fraction of suspended sediment. This conclusion is supported by multiple lines of evidence. Bulk settling velocities increased, riverine SSC and background SSC at slack tides decreased, and resuspension and deposition lags of SSC relative to current speed decreased. This response was strongest in the South Branch, moderate in the North Channel, and not yet apparent in the South Channel, indicating that the changes are still ongoing.
引用
收藏
页码:2185 / 2197
页数:13
相关论文
共 50 条
  • [21] Sediment Transport Capacity Under the River–Tide Interaction in the Changjiang Estuary
    FENG Zhi-yong
    TAN Guang-ming
    XIA Jun-qiang
    ChinaOceanEngineering, 2019, 33 (02) : 207 - 218
  • [22] QUANTITATIVE MODELING OF SUSPENDED SEDIMENT IN MIDDLE CHANGJIANG RIVER FROM MODIS
    LIU Can-de1
    2. Graduate School of Chinese Academy of Sciences
    3. Laboratory of Geographic Information Science
    Chinese Geographical Science, 2006, (01) : 79 - 82
  • [23] Sediment Transport Capacity Under the River–Tide Interaction in the Changjiang Estuary
    Zhi-yong Feng
    Guang-ming Tan
    Jun-qiang Xia
    China Ocean Engineering, 2019, 33 : 207 - 218
  • [24] Quantitative modeling of suspended sediment in middle Changjiang River from modis
    Can-de Liu
    Bao-yin He
    Mao-tian Li
    Xian-you Ren
    Chinese Geographical Science, 2006, 16 : 79 - 82
  • [25] Sediment flux and sediment-induced stratification in the Changjiang Estuary
    Arash Niroomandi
    Gangfeng Ma
    Shih-Feng Su
    Fengfeng Gu
    Dingman Qi
    Journal of Marine Science and Technology, 2018, 23 : 349 - 363
  • [26] QUANTITATIVE MODELING OF SUSPENDED SEDIMENT IN MIDDLE CHANGJIANG RIVER FROM MODIS
    Lu Can-de
    He Bao-yin
    Li Mao-tian
    Ren Xian-you
    CHINESE GEOGRAPHICAL SCIENCE, 2006, 16 (01) : 79 - 82
  • [27] Variation in sediment sources and the response of suspended sediment grain size in the upper Changjiang River Basin following the large dam constructions
    Liu, Jie
    Zheng, Hua
    Shen, Ying
    Xing, Bing
    Wang, Xin
    SCIENCE OF THE TOTAL ENVIRONMENT, 2023, 904
  • [28] Sediment flux and sediment-induced stratification in the Changjiang Estuary
    Niroomandi, Arash
    Ma, Gangfeng
    Su, Shih-Feng
    Gu, Fengfeng
    Qi, Dingman
    JOURNAL OF MARINE SCIENCE AND TECHNOLOGY, 2018, 23 (02) : 349 - 363
  • [29] Transversal distribution of suspended sediment concentration in estuary of Yellow river
    Cao, W.H.
    Zhang, Q.S.
    Hu, C.H.
    Shuili Xuebao/Journal of Hydraulic Engineering, 2001, (02):
  • [30] Assessment of physicochemical properties of suspended sediment in Yangtze river estuary
    Wang, Hua
    Shen, Zilin
    Yan, Yuting
    Liang, Dongfang
    PHYSICAL GEOGRAPHY, 2024, 45 (01) : 39 - 52