CHARACTERISTICS OF DISPERSAL OF THE YELLOW RIVER WATER AND SEDIMENT TO THE SEA DURING WATER-SEDIMENT REGULATION PERIOD OF THE YELLOW RIVER AND ITS DYNAMIC MECHANISM
-
摘要: 以2007年夏季黄河调水调沙期间黄河三角洲海域3断面连续站及渤海南部24个大面站观测的流场、温度、盐度及含沙量资料为依据,分析了调查区水沙扩散特征,计算了各连续站的拉格朗日余流及泥沙输送单宽通量。结果表明,黄河入海泥沙扩散范围非常有限,主要分布在南至莱州湾西南部、北至北纬38°附近离岸约20 km以内的带状沿岸区域;但黄河冲淡水出现大面积扩散,覆盖了整个莱州湾的北部和中部,最远可至龙口附近,黄河入海水沙扩散不同步。在现行河口和钓口流路废弃河口存在两个高浓度泥沙中心,分别对应于黄河入海泥沙和废弃钓口流路海域底质再悬浮产生的两个泥沙来源。河口及三角洲近岸切变锋的阻隔及辐聚作用,是大部分黄河入海泥沙沉积在河口及沿岸13 m水深以内的主要动力因素。受余流方向及水体垂向湍动较弱的影响,两个高浓度泥沙中心很少有泥沙交换。冲淡水的大面积扩散主要受表层余环流的影响。余流及悬浮泥沙通量计算显示,夏季黄河入海水沙在近岸主要向东北方向扩散。Abstract: Data of current velocity, water temperature, salinity and concentration of suspended sediment were collected from 3 time-series survey transects of 3 boats off the Yellow River delta and 24 grid survey stations in the adjacent Bohai Sea during water-sediment regulation period of the River. Based on the collected data,the dispersal characteristics of the river water and sediment to the sea were analyzed, and the residual current and sediment flux of the time-series stations were calculated. The results show that the dispersal area of the Yellow River sediment to the sea was basically limited within the coastal zone to 20 km from the coast, extending to the southwest of the Laizhou Bay in the south and to 38°N in the north. The diluted river water dispersed widely. Covering the north and middle parts of the whole Laizhou Bay, the diluted water could extend to the Longkou City at its farthest southeast end,indicating that the dispersal pattern of the river sediment was quite different from the water dispersal pattern. There were two centers with high sediment concentrations. One of them was located in the river mouth area, and the other was around the abandoned Diaokou River mouth area, corresponding to sediment from the river mouth and sediment from resuspension of the surface sediment in the abandoned river mouth, respectively. The barred and convergent effects of the tidal shear fronts near the river mouth and off the delta coast were responsible for the limited dispersal of the Yellow River sediment within 13 m of the water depth. The wide dispersal of the river diluted water was controlled by the surface residual currents. There was little sediment exchange between the two high sediment concentration centers due to the directions of the residual currents and weak vertical mixing. The residual currents and the sediment flux showed that the direction of the sediment dispersal was basically northeastward.
-
-
[1] Milliman J D, Meade R H. World-wide delivery of river sediments to the oceans[J]. Journal of Geology, 1983, 91:1-21.
[2] WANG Houjie, YANG Zuosheng, Saito Y, et al. Interannual and seasonal variation of the Huanghe (Yellow River) water discharge over the past 50 years:connections to impacts from ENSO events and dams[J]. Global and Planetary Change, 2006, 50(3-4):212-225.
[3] WANG Houjie, YANG Zuosheng, Saito Y, et al. Stepwise decreases of the Huanghe (Yellow River) sediment load (19502005):Impacts of climate change and human activities[J]. Global and Planetary Change, 2007, 57(3-4):331-354.
[4] 王厚杰,杨作升,毕乃双,等. 2005年黄河调水调沙期间河口入海主流的快速摆动[J]. 科学通报,2005,5(23):2656-2662. [WANG Houjie, YANG Zuosheng, BI Naishuang, et al.Rapid shifts of the river plume pathway off the Huanghe (Yellow) River mouth in response to water-sediment regulation scheme in 2005[J]. Chinese Science Bulletin, 2005, 50(24):2878-2884.]
[5] 张龙军, 姜波, 张向上,等. 基于泥沙中碳含量的变化表征黄河调水调沙入海泥沙的扩散范围[J]. 水科学进展, 2008, 19(2):153-159. [ZHANG Longjun, JIANG Bo, ZHANG Xiangshang, et al. Study of carbon content tracing sediment diffusion bound after water-sediment regulation in the Yellow River estuary[J]. Advance in Water Science, 2008, 19(2):153-159.]
[6] 吴德星,万修全,鲍献文,等. 渤海1958年和2000年夏季温盐场及环流结构的比较[J]. 科学通报,2004,49(3):287-292. [WU Dexing, WAN Xiuquan, BAO Xianwen, et al.Comparison of summer thermohaline field and circulation structure of the Bohai Sea between 1958 and 2000[J]. Chinese Science Bulletin, 2004, 49(4):363-369.]
[7] FAN Hui,HUANG Haijun. Response of coastal marine eco-environment to river fluxes into the sea:A case study of the Huanghe (Yellow) River mouth and adjacent waters[J]. Marine Environmental Research, 2008, 65(5):378-387.
[8] Uncles R J, Elliott R C A, Weston S A. Dispersion of salt and suspended sediment in a partly mixed estuary[J]. Estuaries and Coasts, 1985, 8(3):256-269.
[9] 李广雪,成国栋,魏合龙,等. 现代黄河口区流场切变带[J]. 科学通报, 1994,39(10):928-932. [LI Guangxue, CHENG Guodong, WEI Helong, et al.Shearing zone of the current field off the modern Yellow River mouth[J]. Chinese Science Bulletin,1994,39(10):928-932.]
[10] QIAO Lulu, BAO Xianwen, WU Dexing, et al. Numerical study of generation of the tidal shear front off the Yellow River mouth[J]. Continental Shelf Research, 2008, 28(14):1782-1790.
[11] WANG Houjie, YANG Zuosheng, LI Yunhai, et al. Dispersal pattern of suspended sediment in the shear frontal zone off the Huanghe (Yellow River) mouth[J]. Continental Shelf Research, 2007, 27(6):854-871.
[12] BI Naishuang, YANG Zuosheng, WANG Houjie, et al. Sediment dispersion pattern off the present Huanghe subdelta and its dynamic mechanism during normal river discharge period[J]. Estuarine, Coastal and Shelf Science, 2010,86(3):352-362.
[13] HUANG Daji, SU Jilan, Backhaus J O. Modelling the seasonal thermal stratification and baroclinic circulation in the Bohai Sea[J]. Continental Shelf Research, 1999, 19(11):1485-1505.
计量
- 文章访问数: 1752
- HTML全文浏览量: 193
- PDF下载量: 94
下载:
