SUSPENDED SEDIMENT CONCENTRATIONS IN SHALLOW SEA: COMPARATIVE STUDY OF METHODS
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摘要: 在动力和沉积条件复杂的浅海海域获取水-体的悬沙浓度有多种方法,目前较先进的主要是声学和光学浊度测量方法,但均需通过现场采集水样进行浊度标定;水样的分析方法主要有抽滤法和沉淀干燥法。根据2010年3-4月在厦门九龙江口获取的光学(OBS、LISST-100X)和声学(ADCP、ADP和ADV)浊度数据,以及现场同步水样,对这两种获取悬沙浓度的方法进行了比较;2011年2-3月在长江口北支获取水样,分别使用抽滤法和沉淀干燥法获取悬沙浓度数据进行比对分析。结果表明,声学和光学方法都具有较高的精度,在同一观测层位,光学与声学仪器的相对误差均较小;由于声波在水体中传播距离较远,声学方法可获得沿水深的整个剖面的信息,因而比光学仪器具有更高的空间分辨率和测量范围。对比发现,抽滤法获得的悬沙浓度数值略低于沉淀干燥法获得的结果,可能与沉淀干燥法难以洗净盐分有关。Abstract: Various methods were used to measure the suspended sediment concentrations (SSCs) in the Jiulong Estuary in March, 2010 and in the North Branch of Yangtze Estuary in February, 2011. The synchronous acoustics and optical data including OBS, LISST-100X, ADCP, ADP and ADV were obtained by profiling and seabed tripod measurements. During these surveys, water samples were collected from the water columns form the sea surface down to the bottom, and then the SSC was retrieved by filtration in the lab.Distinctions were discerned among the above methods. Firstly, the seawater filtration is a benchmark method. Secondly, SSCs could be successfully and accurately estimated from acoustic and optical instruments installed at the same height above the seabed, with small measurement errors. Hence, they can be replaced each other, as a case of complementary measurement. Finally, the settling method may overestimate the SSCs, comparing to the filtration method due to the saline substance remained in the sediments. Thus, in order to estimate better SSCs, a suitable method should be selected according to the study purpose and local SSC background.
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[1] [2] 陈夏法. 应用遥感技术研究杭州湾秋季悬沙的动态特征[J]. 东海海洋,1988,6(2):37-43.
[CHEN Xiafa. Study of the trends of suspended sediments in Hangzhou Bay in autumn by use of remote-sensing technique[J]. Donghai Marine Science,1988,6(2):37-43.]
[3] 周跃,吕喜玺,陈平. 河流悬沙浓度的地面遥感预测方法初步研究——以金沙江下游支流为例[J]. 昆明理工大学学报:理工版, 2005,30(5):83-86.
[ZHOU Yue, LU Xixi, CHEN Ping. Preliminary study on estimation of suspended sediment concentration in river with in-situ remote sensing technique an example from the Lower Jinsha Tributary[J]. Journal of Kunming University of Science and Technology(Science and Technology),2005,30(5):83-86.]
[4] 傅克忖,荒川久幸. 悬沙水体不同波段反射比的分布特征及悬沙量估算实验研究[J]. 海洋学报,1999,21(3):134-140.
[FU Kecun, Hisayuki Arakawa. Distribution feature of reflectance of water body containing suspended particles in different wave lengths and experimental study on estimating amount of suspended particles[J]. Acta Oceanology Sinica,1999,21(3):134-140.]
[5] Green M O. Silt and sand transport in a deep tidal channel of a large estuary (Manukau Harbour, New Zealand)[J]. Marine Geology,2000,163(1-4):217-240.
[6] Van Weering T C E. Recent sediment transport and accumulation on the NW Iberian margin[J]. Progress in Oceanography, 2002,52(2-4):349-371.
[7] Wang Y P, Gao S, Li K Y. A preliminary study on suspended sediment concentration measurements using an ADCP mounted on a moving vessel[J]. Chinese Journal of Oceanology and Limnology, 2000,18(2):183.
[8] 程鹏,高抒. ADCP测量悬沙浓度的可行性分析与现场标定[J]. 海洋与湖沼, 2001,32(2):168-176.
[CHEN Peng, GAO Shu. Suspended sediment concentration measurements with ADCP:feastibility analysis and in situ calibration[J]. Oceanologia et Limnologia Sinica,2001,32(2):168-176.]
[9] Jeffrey W Gartner. Estimating suspended solids concentrations from backscatter intensity measured by acoustic Doppler current profiler in San Francisco Bay, California[J]. Marine Geology, 2004, 211:169-187.
[10] 高建华,汪亚平,王爱军,等. ADCP在长江口悬沙输运观测中的应用[J]. 地理研究, 2004,23(4):455-462.
[GAO jianhua, WANG Yaping, WANG Aijun, et al. Suspended sediment behavior and transport in CHangjiang River Estuary[J]. Geographical Research,204,23(4):455-462.]
[11] Hoitink A J F, Hoekstra P. Observations of suspended sediment from ADCP and OBS measurements in a mud-dominated environment[J]. Coastal Engineering,2005, 52(2):103-118.
[12] Thorne P D, Hanes D M. A review of acoustic measurement of small-scale sediment processes[J]. Continental Shelf Research, 2002, 22(4):603-632.
[13] Thevenot M M, Kraus N C. Comparison of acoustical and optical measurements of suspended material in the Chesapeake Estuary[J]. Journal of Marine Environment Engineering, 1993,(1):65-79.
[14] Fugate D C, Friedrichs C T. Determining concentration and fall velocity of estuarine particle populations using ADV, OBS and LISST[J]. Continental Shelf Research, 2002, 22(11-13):1867-1886.
[15] Hoitink A J F, Hoekstra P. Observations of suspended sediment from ADCP and OBS measurements in a mud-dominated environment[J]. Coastal Engineering,2005,52:103-118.
[16] 原野,赵亮,魏皓,等. 利用ADCP和LISST-100仪观测悬浮物浓度的研究[J]. 海洋学报,2008,30(3):48-55.
[YUAN Ye, ZHAO Liang, WEI Hao, et al. Research on observing suspended sediment concentration using ADCP and LISST-100 instruments[J]. Acta Oceanologica Sinica, 2008,30(3):48-55.]
[17] 张文祥,罗向欣,杨世伦. ADP与OBS观测悬沙浓度实验对比研究[J]. 泥沙研究, 2010,10(5):59-65.
[ZHANG Wenxiang, LUO Xiangxin, YANG Shilun. Comparison between measurements of suspended sediment concentration using ADP and OBS[J]. Journal of Sediment Research,2010,10(5):59-65.]
[18] 汪亚平,潘少明,WANG H V, 等. 长江口水沙入海通量的观测与分析[J]. 地理学报,2006,61(1):35-46.
[WANG Yaping, PAN Shaoming, WANG H V, et al. Measurements and analysis of water discharges and suspended sediment fluxes in Changjiang Estuary[J]. Acta Geographica Sinica,2006,61(1):35-46.]
[19] Denies K L. Backscatter estimation using broadband acoustic Doppler current profilers[C]//Proceedings of the IEEE Sixth Working Conference on Current Measurements.1999:249-253.
[20] 汪亚平,高建华. 河口海岸区悬沙输运量的声学多谱勒流速剖面(ADCP)观测技术的初步研究[J]. 科学技术与工程, 2003,3(5):467-470.
[WANG Yaping, GAO Jianhua. A Preliminary Study on Suspended Sediment Transport in Coastal Estuary by Using ADCP[J]. Science Technology and Engineering,2003,3(5):467-470.]
[21] 汪亚平,高抒,李坤业. 用ADCP进行走航式悬沙浓度测量的初步研究[J]. 海洋与湖沼,1999,30(6):758-763.
[WANG Yaping, GAO Shu, LI Kunye. A Preliminary study on suspended sediment concentration measurements using an ADCP mounted on a moving vessel[J]. Oceanologia et Limnologia Sinica,1999,30(6):758-763.]
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