Delineating suspended sediment concentration patterns in surface waters of the Changjiang Estuary by remote sensing analysis

Delineating suspended sediment concentration patterns in surface waters of the Changjiang Estuary by remote sensing analysis
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利用遥感分析描绘长江口表层水体悬浮泥沙浓度模式

DOI:
10.1007/s13131-010-0049-4
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发表时间:
2010-10
影响因子:
1.4
通讯作者:
Gao Shu
Gao Shu
中科院分区:
地球科学2区
文献类型:
--
作者:
Li Jing;Wang Yapine;Gao Shu

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利用1987年5月18日、1998年8月4日和2007年7月28日3幅Landsat TM图像,分析了长江口表层沃茨悬浮泥沙浓度的时空变化特征。利用FLAASH模块进行大气校正以确定离水反射率。通过建立悬浮泥沙指数与实测悬浮泥沙指数之间的回归方程,从TM图像上反演悬浮泥沙指数。此外,还进行了潮汐调和分析,以计算与卫星图像获取时间相对应的潮汐条件。结果表明,长江口最大浑浊带区域的悬浮物浓度最高,其空间分布与现场观测结果基本一致。在1987 - 2007年期间,SSC的模式主要是由潮汐动力条件和风速,而不是来自河流的泥沙排放控制。
Three Landsat TM imageries (taken on 18 May 1987, 4 August 1998 and 28 July 2007) were used as the data source to identify the spatial and temporal variations of the suspended sediment concentration (SSC) in surface waters of the Changjiang Estuary. Atmospheric correction was carried out to determine the water-leaving reflectance using the FLAASH module. A regression equation between surveyed SSC and suspended sediment index was chosen to retrieve the SSC from the Landsat TM images. In addition, tidal harmonic analysis was performed to calculate tidal conditions corresponding to the acquisition time of satellite images. The results show that the SSC spatial patterns are similar to thein situobservation results, which show the highest SSC in the region of turbidity maximum zone in the Changjiang Estuary. For the period of 1987 to 2007, the SSC pattern is controlled mainly by tidal dynamic conditions and wind speeds, rather than sediment discharges from the river.
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发表时间: 2004-06
影响因子: 6.4
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