The 2D distribution characteristics and formation mechanism of suspended sediment concentration during the flood season in the Lingdingyang Estuary
-
摘要: 基于伶仃洋河口2007年洪季(8月)潮流和泥沙现场观测资料,通过实测资料分析结合二维泥沙数值模型的方法,分析其悬沙浓度平面分布特征。结果表明,悬沙浓度从伶仃洋湾顶虎门至湾口沿西槽向海在纵向上呈现出先减小再增大后减小的变化趋势;横向上,西槽最大,东槽和中滩次之;内伶仃岛西北侧海域为含沙量高值中心。悬沙纵向输移机制分析表明,伶仃洋洪季输沙主要贡献项为平流向海输沙、潮汐捕集和垂向环流的向陆输沙,其中后两项在内伶仃岛附近的贡献较大。潮流、径流来沙、径潮强度对比以及地形边界作用为悬沙场平面分布差异的主要成因。Abstract: Based on the observed data of current and suspended sediment concentration (SSC) during the flood season (13-14 and 16-17, August, 2007), by the means of measured data analysis and the TELEMAC-2D numerical model, this article reveals the spatial distribution characteristics of SSC in the Lingdingyang Esturay:in the longitudinal direction along west channel, SSC decrease first, then increase, and then decrease again from bay head to open sea; laterally, west channel, east channel and the north of the middle flat are higher SSC areas; the maximal center of SSC is located on the northwest of Neilingding Island. The model of longitudinal material transport reveals that the main reasons of net suspended sediment transport are advection, tidal asymmetry and vertical circulation. The effects of tidal current, runoff with sediment transport, solid boundary and topography condition are the main reasons for the 2D distribution characteristics of SSC in the Lingdingyang Estuary.
-
Dai Zhijun, Chu Ao, Li Weihua, et al. Has suspended sediment concentration near the mouth bar of the Yangtze (Changjiang) Estuary been declining in recent years?[J]. Journal of Coastal Research, 2013, 29(4):809-818. Kong Dongxian, Miao Chiyuan, Wu Jingwen, et al. The hydro-environmental response on the lower Yellow River to the water-sediment regulation scheme[J]. Ecological Engineering, 2015, 79:69-79. 胡德礼, 杨清书, 吴超羽, 等. 珠江网河水沙分配变化及其对伶仃洋水沙场的影响[J]. 水科学进展, 2010, 21(1):69-76. Hu Deli, Yang Qingshu, Wu Chaoyu, et al. Changing water and sediment dynamics in the Pearl River network and consequences on water and sediment regimes in the Lingdingyang estury[J]. Advances in Water Science, 2010, 21(1):69-76. 广东省水利电力勘测设计研究院. 珠江河口近期防洪实施工程可行性研究报告[R]. 广州:广东省水利电力勘测设计研究院, 2002:20-35. Guangdong Hydropower Planning & Design Institute. Feasibility study report of recent flood control project implementation in Pearl River Estuary[R]. Guangzhou:Guangdong Hydropower Planning & Design Institute, 2002:20-35. 姚才华, 吴自银. 30a来伶仃洋海岸线变迁及海底冲淤变化[J]. 海洋学研究, 2012, 30(3):44-55. Yao Caihua,Wu Ziyin. Shoreline migration and scour-and-silting alternation in the Lingdingyang estuary over past 30 years[J]. Journal of Marine Sciences, 2012, 30(3):44-55. Einstein H A, Krone R B. Experiments to determine modes of cohesive sediment transport in salt water[J]. Journal of Geophysical Research, 1962, 67(4):1451-1461. Partheniades E, Paaswell R E. Erodibility of channels with cohesive boundary[J]. Journal of the Hydraulics Division, 1970, 96(3):755-771. Schultz E A, Simmons H B. Fresh water-salt water density currents:a major cause of siltation in estuaries[M]. Waterways Experiment Station, 1957. Simmons H B, Broun F R. Salinity effect on hydraulics and shoaling in estuary[J]. IAHR 13th congress 1969,1969:311-326. Ingram R G. Characteristics of the Great Whale River plume[J]. Journal of Geophysical Research:Oceans, 1981, 86(C3):2017-2023. Uncles R J, Elliott R C A, Weston S A. Observed fluxes of water, salt and suspended sediment in a partly mixed estuary[J]. Estuarine, Coastal and Shelf Science, 1985, 20(2):147-167. 任杰, 包芸, 林卫强. 珠江口伶仃洋水沙纵向输移特征分析[J]. 热带海洋学报, 2001, 20(3):35-40. Ren Jie, Bao Yun, Lin Weiqiang. Analyses on water and suspended sediment fluxes in Lingdingyang estuary of Zhujiang river mouth[J]. Journal of Tropical Oceanography, 2001, 20(3):35-40. 沈健, 沈焕庭, 潘定安, 等. 长江河口最大浑浊带水沙输运机制分析[J]. 地理学报, 1995, 50(5):411-420. Shen Jian, Shen Huanting, Pan Dingan, et al. Analysis of transport mechanism of water and suspended sediment in the turbidity maximum of the Changjiang estuary[J]. Acta Geographica Sinica, 1995, 50(5):411-420. 吴超羽, 任杰, 包芸, 等. 珠江河口"门" 的地貌动力学初探[J]. 地理学报, 2006, 61(5):537-548. Wu Chaoyu, Ren Jie, Bao Yun, et al. A preliminary study on the morphodynamic evolution of the ‘Gate’ of the Pearl River Delta, China[J]. Acta Geographica Sinica, 2006, 61(5):537-548.
点击查看大图
计量
- 文章访问数: 827
- HTML全文浏览量: 14
- PDF下载量: 436
- 被引次数: 0