Determining suspended sediment concentration and settling velocity from PC-ADP measurements in the Beibu Gulf, China

IOCAS-IR

	Determining suspended sediment concentration and settling velocity from PC-ADP measurements in the Beibu Gulf, China
	Yu JQ(于建清); Jiang JB(姜静波); Gong DJ(龚德俊); Li SR(李思忍); Xu YP(徐永平)
发表期刊	Chinese Journal of Oceanology and Limnology
ISSN	0254-4059
	2011-05-15
出版年	2011
卷号	v.29 期号:03 页码:201-211
文献类型	CNKI期刊论文
摘要	Modeling sediment transport depends on several parameters, such as suspended sediment concentration (SSC), shear stress, and settling velocity. To assess the ability of Pulse-Coherent Acoustic Doppler Profiling (PC-ADP) to non-intrusively quantify spatial and temporal SSC and settling velocity at seabed, a field experiment was conducted in the Beibu Gulf (Tonkin Gulf), in the South China Sea. The spatial profiles and temporal variations in SSC at 1 m above bottom were derived from PC-ADP acoustic backscatter intensity determinations after being calibrated with the optical backscatter sensor (OBS) measurements at the same elevation. The PC-ADP and OBS results agreed well. The temporal settling velocity obtained from Rouse profiles agreed well with the Soulsby formula based on size information by LISST (laser in situ scattering and transmissometry). Tides and tidal currents are diurnal in the gulf. SSC increased with increasing ebb and flood flow, and it rapidly decreased with the increase of distance from the seabed. The maximum SSC at 0.16 m and 1.3 m above bottom reached 816 mg/L and 490 mg/L during spring tides, respectively. The sediments consisted of mineral particles 23-162 μm in diameter and 0.05-2.04 cm/s in settling velocity. Generally, both the SSC and settling velocity followed variations in the bottom friction. Results suggest that PC-ADP is able to provide reasonable SSC and settling velocity measurements of both profiles and time series for a long study period.
关键词	suspended sediment settling velocity shear velocity acoustic backscatter tidal currents Beibu Gulf
CNKI专辑号	A;C;
CNKI专辑名称	基础科学;工程科技Ⅱ辑;
CNKI专题号	C037;A012;
CNKI专题名称	水利水电工程;地球物理学;
分类号	TV148.1
收录类别	中科院核心
语种	英文;
资助项目(基金）	Supported by Major Programs of the Chinese Academy of Sciences (No. H42032602) ; the National Natural Science Foundation of China (No. 470776061)
文献类型	CNKI期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/191702
专题	中国科学院海洋研究所
作者单位	1.InstituteofOceanology,ChineseAcademyofSciences 2.GraduateUniversityofChineseAcademyofSciences 3.NationalCenterofOceanStandardsandMetrology
推荐引用方式 GB/T 7714	Yu JQ,Jiang JB,Gong DJ,et al. Determining suspended sediment concentration and settling velocity from PC-ADP measurements in the Beibu Gulf, China. 2011.