Satellite Based Monitoring of Turbidity around Hai Phong Bay, Vietnam

This paper developsa satellite-based monitoring system for observations of spatial and temporal varia-tions of turbidity of the sea surface around Hai Phong Bay in the northern part of Vietnam. The monitoring system is based on MODIS and consists of sub-tools required for the monitoring, such as cloud masking and turbidity estimations based on multiple band data. The developed system is validated through com-parisons of estimated and measured turbidity patterns around Hai Phong Bay. The system is then applied for monitoring of turbidity patterns around the bay overthe past sixteen yearsand it was found through the monitoring that observed turbidity shows decreasing trend after the construction of dams along the up-stream of the rivers around the area.

 1. INTRODUCTION

 2. STUDY AREA

3. FIELD SURVEY

4. MONITORING SYSTEM

(1) Turbidity estimation

(2) Cloud masking

(3) Turbidity map

(4) Cell system

5. DISCUSSIONS

(1) Tidal influence

(2) Long-term trend of averaged turbidity

(3) Seasonal Variations

5. CONCLUSIONS

REFERENCES

1) Hori, K., Tanabe, S., Saito, Y., Haruyama, S., Nguyen, V., and Kita- mura, A.: Delta initiation and Holocene sea-level change: exam- ple from the Song Hong (Red River) delta, Vietnam, Sediment. Geol., 164, 237–249, 2004.

2) Lefebvre, J. P., Ouillon, S., Vu, D. V., Arfi, R., Panche, J. Y., Mari, X., Chu, V. T., and Torréton, J. P.: Seasonal varia-bility of co- hesive sediment aggregation in the Bach Dang-Cam Estuary, Haiphong (Vietnam), Geo-Mar. Lett., 32, 103–121, 2012.

3) Vermote, E. F., El Saleous,N. Z., & Justice, C.O. (2002). Atmospheric correction ofMODIS data in the visible to middle infrared: First results. Remote Sensing of Environ-ment, 83,97–111.

4) Vermote, E. F., & Vermeulen, A. (1999). MODIS algorithm technical background document, atmospheric correction algorithm: Spectral reflectance (MOD09). NASA, contract NAS5-96062

5) Doxaran, D., Froidefond, J.M., & Castaing, P. (2002). Areflectance band ratio used to esti- mate suspended matter concentrations in sediment-dominated coastal waters. In-ternational Journal of Remote Sensing, 23,5079–5085.

6) National research project (code KC08.34/11-15). (2015). Science-based research and proposed solutions to improve the phenomenon of sedimatation in Do Son estuary, Hai Phong City, Vietnam. Center for river hydraulics engi-neering, Vietnam Academy for Water Resources.

See detail: Satellite Based Monitoring of Turbidity around Hai Phong Bay, Vietnam

Kavinda GUNASEKARA1, Yoshimitsu TAJIMA2, Le Hanh CHI3, Ho Viet CUONG4, Nguyen Thanh HUNG4 and Le Manh HUNG4
1Ph.D. Student, Dept. of Civil Eng., The University of Tokyo
(7-3-1 Hongoongo, Bunkyo-ku, Tokyo 113113-8656 . Japan)
E-mail: kavinda@coastal.t.u-tokyo.ac.jp
2Member of JSCE, Professor, Dept. of Civil Eng., The University of Tokyo
(7 -3-1 Hongo, Bunkyo-ku, Tokyo 113113-8656 .
E-mail: yoshitaji@coastal.t.u -tokyo.ac.jp
3General Planning Department, Vietnam Academy of Water Resources
(171 Tay Son, Dong Da district, Hanoi, Vietnam)
4Key laboratory of River and Coast. eng. Vietnam Academy of Water Resources
(No : 1, alley 165 Chua Boc street, Dong Da district, Hanoi, Vietnam)

Journal of Japan Society of Civil Engineers, Ser.B3 (Ocean Engineering), Vol. 72, No. 2, I_772-I_777, 2016.