中国地理科学 ›› 2017, Vol. 27 ›› Issue (6): 934-947.doi: 10.1007/s11769-017-0921-7

• 论文 • 上一篇    下一篇

Remote Sensing Retrieval of Surface Suspended Sediment Concentration in the Yellow River Estuary

ZHAN Chao1,2,3, YU Junbao1,2, WANG Qing2, LI Yunzhao2, ZHOU Di2, XING Qinghui1,3, CHU Xiaojing1,3   

  1. 1. Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China;
    2. The Institute of Coastal Ecology, Ludong University, Yantai 264025, China;
    3. University of Chinese Academy of Sciences, Beijing 100049, China
  • 收稿日期:2017-05-08 修回日期:2017-08-01 出版日期:2017-12-27 发布日期:2017-11-06
  • 通讯作者: YU Junbao.E-mail:junbao.yu@gmail.com E-mail:junbao.yu@gmail.com
  • 基金资助:

    Under the auspices of National Key R&D Program of China (No. 2017YFC0505902), Project of the Cultivation Plan of Superior Discipline Talent Teams of Universities in Shandong Province, National Natural Science Foundation of China (No. 41471005, 41271016)

Remote Sensing Retrieval of Surface Suspended Sediment Concentration in the Yellow River Estuary

ZHAN Chao1,2,3, YU Junbao1,2, WANG Qing2, LI Yunzhao2, ZHOU Di2, XING Qinghui1,3, CHU Xiaojing1,3   

  1. 1. Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China;
    2. The Institute of Coastal Ecology, Ludong University, Yantai 264025, China;
    3. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2017-05-08 Revised:2017-08-01 Online:2017-12-27 Published:2017-11-06
  • Contact: YU Junbao.E-mail:junbao.yu@gmail.com E-mail:junbao.yu@gmail.com
  • Supported by:

    Under the auspices of National Key R&D Program of China (No. 2017YFC0505902), Project of the Cultivation Plan of Superior Discipline Talent Teams of Universities in Shandong Province, National Natural Science Foundation of China (No. 41471005, 41271016)

摘要:

Accurate assessment of surface suspended sediment concentration (SSSC) in estuary is essential to address several important issues:erosion, water pollution, human health risks, etc. In this study, an empirical cubic retrieval model was developed for the retrieval of SSSC from Yellow River Estuary. Based on sediments and seawater collected from the Yellow River and southeastern Laizhou Bay, SSSC conditions were reproduced in the laboratory at increasing concentrations within a range common to field observations. Continuous spectrum measurements of the various SSSCs ranging from 1 to 5700 mg/l were carried out using an AvaField-3 spectrometer. The results indicated the good correlation between water SSSC and spectral reflectance (Rrs) was obtained in the spectral range of 726-900 nm. At SSSC greater than 2700 mg/L, the 740-900 nm spectral range was less susceptible to the effects of spectral reflectance saturation and more suitable for retrieval of high sediment concentrations. The best correlations were obtained for the reflectance ratio of 820 nm to 490 nm. Informed by the correlation between Rrs and SSSC, a retrieval model was developed (R2=0.992). The novel cubic model, which used the ratio of a near-infrared (NIR) band (740-900 nm) to a visible band (400-600 nm) as factors, provided robust quantification of high SSSC water samples. Two high SSSC centers, with an order of 103 mg/l, were found in the inversion results around the abandoned Diaokou River mouth, the present Yellow River mouth to the abandoned Qingshuigou River mouth. There was little sediment exchange between the two high SSSC centers due to the directions of the residual currents and vertical mixing.

关键词: surface suspended sediment concentration (SSSC), water spectral reflectance, cubic model, quantitative remote sensing inversion, Yellow River Estuary

Abstract:

Accurate assessment of surface suspended sediment concentration (SSSC) in estuary is essential to address several important issues:erosion, water pollution, human health risks, etc. In this study, an empirical cubic retrieval model was developed for the retrieval of SSSC from Yellow River Estuary. Based on sediments and seawater collected from the Yellow River and southeastern Laizhou Bay, SSSC conditions were reproduced in the laboratory at increasing concentrations within a range common to field observations. Continuous spectrum measurements of the various SSSCs ranging from 1 to 5700 mg/l were carried out using an AvaField-3 spectrometer. The results indicated the good correlation between water SSSC and spectral reflectance (Rrs) was obtained in the spectral range of 726-900 nm. At SSSC greater than 2700 mg/L, the 740-900 nm spectral range was less susceptible to the effects of spectral reflectance saturation and more suitable for retrieval of high sediment concentrations. The best correlations were obtained for the reflectance ratio of 820 nm to 490 nm. Informed by the correlation between Rrs and SSSC, a retrieval model was developed (R2=0.992). The novel cubic model, which used the ratio of a near-infrared (NIR) band (740-900 nm) to a visible band (400-600 nm) as factors, provided robust quantification of high SSSC water samples. Two high SSSC centers, with an order of 103 mg/l, were found in the inversion results around the abandoned Diaokou River mouth, the present Yellow River mouth to the abandoned Qingshuigou River mouth. There was little sediment exchange between the two high SSSC centers due to the directions of the residual currents and vertical mixing.

Key words: surface suspended sediment concentration (SSSC), water spectral reflectance, cubic model, quantitative remote sensing inversion, Yellow River Estuary