Integrating satellite imagery and geostatistics of point samples for monitoring spatio-temporal changes of total suspended solids in bay waters: application to Tien Yen Bay (Northern Vietnam)

Abstract

High concentrations of total suspended solids (TSS) in coastal and bay areas strongly affect water quality and aquatic ecosystems. Frequent monitoring of spatio-temporal changes of TSS distribution in such areas is indispensable for understanding sediment fluxes and water cycles, and to preserve ecosystem health. This study aimed to identify appropriate and sufficient tools for assessing changes in TSS distribution in Tien Yen Bay in Northern Vietnam, a typical closed bay, which was selected as the study area because of its rich biodiversity. Initially, a physical based model using the reflectance at the sea surface was developed for estimating TSS concentrations from satellite image data, and a model with an exponential function was identified as suitable for the estimation. This model was fitted appropriately to provide a relationship between reflectance from the MODIS/Terra band 1 (visible red) after the atmospheric correction and the in situ TSS concentrations at 40 points. Ordinary kriging was then shown to be effective in improving the spatial resolution of the MODIS/Terra image-based estimation of the TSS concentration at a 250 m interval, because it could detect TSS variation in detail, in particular in the local estuaries. TSS distributions derived from 12 MODIS/Terra images from November 2009 to October 2010 clarified seasonal changes in TSS during one year. TSS concentrations were high during summer and lower during fall and winter. Such trends were conformable with the hydrodynamics in Tien Yen Bay. Consequently, the proposed method was more effective for TSS estimation than traditional methods using satellite image data only.

Keywords

total suspended solids (TSS) / water quality / MODIS band 1 / ordinary kriging / seasonal change

References

[1] Adler-Golden S M, Matthew M W, Bernstein L S, Levine R Y, Berk A, Richtsmeier S C, Acharya P K, Anderson G P, Felde G, Gardner J, Hoke M, Jeong L S, Pukall B, Ratkowski A, Burke H K (1999). Atmospheric Correction for Short-wave Spectral Imagery Based on MODTRAN4. SPIE Proc. Imaging Spectrometry, 3753: 61-69

[2] Berk A, Anderson G P, Acharya P K, Chetwynd J H, Bernstein L S, Shettle E P, Matthew M W, Adler-Golden S M (2000). MODTRAN4 User’s Manual. Hanscom AFB: Air Force Research Laboratory, Space Vehicles Directorate, Air Force Material Command, 97

[3] Chavez J P S Jr (1988). An improved dark-object subtraction technique for atmospheric scattering correction of multispectral data. Remote Sens Environ, 24(3): 459-479

[4] Chen C A, Ablan M C A, McManus J W, Bell J D, Tuan V S, Cabanban A S, Shao K T (2004). Population structure and genetic variability of six bar wrasse (Thallasoma hardwicki) in Northern South China Sea revealed by mitochondrial control region sequences. Mar Biotechnol (NY), 6(4): 312-326

[5] Chen Z, Hu C, Muller-Karger F (2007). Monitoring turbidity in Tampa Bay using MODIS/Aqua 250-m imagery. Remote Sensing of Environment, V. 109. 207-220

[6] Cressie N A C (1993). Statistics for Spatial Data Revised Edition. New York: John Wiley & Sons, Inc.900

[7] Hu C M, Chen Z Q, Clayton T D, Swarzenski P, Brock JC, Muller-Karger F E (2004). Assessment of estuarine water-quality indicators using MODIS medium-resolution bands: Initial results from Tampa Bay, FL. Remote Sens Environ, 93(3): 423-441

[8] Miller R L, McKee B A (2004). Using MODIS Terra 250m imagery to map concentrations of total suspended matter in coastal water. Remote Sens Environ, 93(1-2): 259-266

[9] Morel A (1980). In-water and remote measurements of ocean color. Boundary-Layer Meteorol, 18(2): 177-201

[10] MONRE (The Ministry of Natural Resources and Environment, Vietnam) (2008). National technical regulation on coastal water quality. QCVN 10 : 2008/BTNMT. Hanoi: MONRE, 7p.

[11] Ouillon S, Douillet P, Petrenko A, Neveux J, Dupouy C, Froidefond J, Andréfouët S, Muñoz-Caravaca A (2008). Optical Algorithms at Satellite Wavelengths for Total Suspended Matter in Tropical Coastal Waters. Sensors (Basel Switzerland), 8(7): 4165-4185

[12] Petus C, Chust G, Gohin F, Doxaran D, Froidefond J M, Sagarminaga Y (2010). Estimating turbidity and total suspended matter in the Adour River plume (South Bay of Biscay) using MODIS 250-m imagery. Journal of Continental Shelf Research, 30(5): 379-392

[13] Rodríguez-Guzmán V, Gilbes-Santaella F (2009). Using MODIS 250 m Imagery to Estimate Total suspended solids in a Tropical Open Bay. International Journal of Systems Applications. Engineering & Development, 3(1): 36-44

[14] Theodossiou N, Latinopoulos P (2006). Evaluation and optimization of groundwater observation networks using the Kriging methodology. Environ Model Softw, 21(7): 991-1000

[15] UNEP (United Nations Environmental Programme) (2004). Seagrass in the South China Sea. Technical document of Project: “Reversing Environmental Degradation Trends in the South China Sea and Gulf of Thailand”. Bangkok: UNEP, 16

[16] VEPA (Vietnam Environment Protection Agency), IUCN, Mekong Wetlands Biodiversity Conservation and Sustainable Use Programme (2005). Overview of Wetland Status in Vietnam following 15 years of Ramsar Convention Implementation. Hanoi: VEPA, 80

[17] Vermote E F, El Saleoql N, Justice C O, Kaufman Y J, Privette J L, Remer L, Roger J C, Tank D (1997). Atmospheric correction of visible to middle-infrared EOS MODIS data over land surface: Background, operational algorithm and validation. J Geophys Res, 102(17): 131-141

[18] Xu J T, Hood R R, Chao S Y (2005). A simple empirical optical model for simulating light attenuation variability in a partially mixed estuary. Journal of Estuaries, 28(4): 572-580

[19] Zhang M, Tang J, Dong Q, Song Q T, Ding J (2010 a). Retrieval of total suspended matter concentration in the Yellow and East China Seas from MODIS imagery. Remote Sens Environ, 114(2): 392-403

[20] Zhang Y, Lin S, Liu J, Qian X, Ge Y (2010 b). Time-series MODIS image-based retrieval and distribution analysis of total suspended matter concentrations in Lake Taihu (China). Int J Environ Res Public Health, 7(9): 3545-3560

Acknowledgments

We are grateful to Professor Mai Trong Nhuan and other colleagues at the Hanoi University of Science for their support and assistance in the fieldwork and sample analysis, and NASA for providing MODIS data. Sincere thanks are extended to anonymous reviewers for their valuable comments and suggestions.

RIGHTS & PERMISSIONS

2014 Higher Education Press and Springer-Verlag Berlin Heidelberg