Sediment dynamics of Negombo Lagoon Ooutlet, Sri Lanka.

Pushpa Kumara Dissanayake, Trang Minh Duong, Harshinie Karunarathna, Ranasinghe W M R J B Ranasinghe

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Abstract

This paper presents a 2DH modelling approach used to investigate sediment dynamics and potential morphological changes of the Negombo lagoon outlet, Sri Lanka. Schematised wave, wind and river-inflow parameters were imposed representing the present day forcing scenario. The model was initially calibrated against the measured water level and velocity data, and then implemented to observe sediment dynamics and morphodynamics. Northward alongshore transport in this area changes to the west-east orientation at the outlet and is interrupted by the lagoon sediment export. Channels at the lagoon end have different transport capacities. Residual transport showed a sediment exporting system in the lagoon. One-year period of morphological evolution suggested that the narrow connecting channel between the lagoon and the sea experiences erosion and sedimentation in front of the lagoon entrance. Also, erosion at the apex of the western headland provides sediment to south and north therein.

Original languageEnglish
Title of host publicationCoastal Sediments 2015
Subtitle of host publicationThe Proceedings of the Coastal Sediments 2015
EditorsPing Wang, Julie D. Rosati, Jun Cheng
PublisherWorld Scientific
ISBN (Electronic)978-981-4689-98-4 , 978-981-4689-97-7
DOIs
Publication statusPublished - 15 Apr 2015
EventCoastal Sediments 2015 - Washington D.C., San Diego, United States
Duration: 11 May 201516 May 2015

Conference

ConferenceCoastal Sediments 2015
CountryUnited States
CitySan Diego
Period11/05/1516/05/15
Other11-05-2015 - 16-05-2015

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lagoon
sediment
erosion
morphodynamics
wind wave
inflow
water level
sedimentation
river
modeling

Cite this

Dissanayake, P. K., Duong, T. M., Karunarathna, H., & Ranasinghe, R. W. M. R. J. B. (2015). Sediment dynamics of Negombo Lagoon Ooutlet, Sri Lanka. In P. Wang, J. D. Rosati, & J. Cheng (Eds.), Coastal Sediments 2015: The Proceedings of the Coastal Sediments 2015 World Scientific. https://doi.org/10.1142/9789814689977_0199
Dissanayake, Pushpa Kumara ; Duong, Trang Minh ; Karunarathna, Harshinie ; Ranasinghe, Ranasinghe W M R J B. / Sediment dynamics of Negombo Lagoon Ooutlet, Sri Lanka. Coastal Sediments 2015: The Proceedings of the Coastal Sediments 2015. editor / Ping Wang ; Julie D. Rosati ; Jun Cheng. World Scientific, 2015.
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abstract = "This paper presents a 2DH modelling approach used to investigate sediment dynamics and potential morphological changes of the Negombo lagoon outlet, Sri Lanka. Schematised wave, wind and river-inflow parameters were imposed representing the present day forcing scenario. The model was initially calibrated against the measured water level and velocity data, and then implemented to observe sediment dynamics and morphodynamics. Northward alongshore transport in this area changes to the west-east orientation at the outlet and is interrupted by the lagoon sediment export. Channels at the lagoon end have different transport capacities. Residual transport showed a sediment exporting system in the lagoon. One-year period of morphological evolution suggested that the narrow connecting channel between the lagoon and the sea experiences erosion and sedimentation in front of the lagoon entrance. Also, erosion at the apex of the western headland provides sediment to south and north therein.",
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Dissanayake, PK, Duong, TM, Karunarathna, H & Ranasinghe, RWMRJB 2015, Sediment dynamics of Negombo Lagoon Ooutlet, Sri Lanka. in P Wang, JD Rosati & J Cheng (eds), Coastal Sediments 2015: The Proceedings of the Coastal Sediments 2015. World Scientific, Coastal Sediments 2015, San Diego, United States, 11/05/15. https://doi.org/10.1142/9789814689977_0199

Sediment dynamics of Negombo Lagoon Ooutlet, Sri Lanka. / Dissanayake, Pushpa Kumara; Duong, Trang Minh; Karunarathna, Harshinie; Ranasinghe, Ranasinghe W M R J B.

Coastal Sediments 2015: The Proceedings of the Coastal Sediments 2015. ed. / Ping Wang; Julie D. Rosati; Jun Cheng. World Scientific, 2015.

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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T1 - Sediment dynamics of Negombo Lagoon Ooutlet, Sri Lanka.

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N2 - This paper presents a 2DH modelling approach used to investigate sediment dynamics and potential morphological changes of the Negombo lagoon outlet, Sri Lanka. Schematised wave, wind and river-inflow parameters were imposed representing the present day forcing scenario. The model was initially calibrated against the measured water level and velocity data, and then implemented to observe sediment dynamics and morphodynamics. Northward alongshore transport in this area changes to the west-east orientation at the outlet and is interrupted by the lagoon sediment export. Channels at the lagoon end have different transport capacities. Residual transport showed a sediment exporting system in the lagoon. One-year period of morphological evolution suggested that the narrow connecting channel between the lagoon and the sea experiences erosion and sedimentation in front of the lagoon entrance. Also, erosion at the apex of the western headland provides sediment to south and north therein.

AB - This paper presents a 2DH modelling approach used to investigate sediment dynamics and potential morphological changes of the Negombo lagoon outlet, Sri Lanka. Schematised wave, wind and river-inflow parameters were imposed representing the present day forcing scenario. The model was initially calibrated against the measured water level and velocity data, and then implemented to observe sediment dynamics and morphodynamics. Northward alongshore transport in this area changes to the west-east orientation at the outlet and is interrupted by the lagoon sediment export. Channels at the lagoon end have different transport capacities. Residual transport showed a sediment exporting system in the lagoon. One-year period of morphological evolution suggested that the narrow connecting channel between the lagoon and the sea experiences erosion and sedimentation in front of the lagoon entrance. Also, erosion at the apex of the western headland provides sediment to south and north therein.

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Dissanayake PK, Duong TM, Karunarathna H, Ranasinghe RWMRJB. Sediment dynamics of Negombo Lagoon Ooutlet, Sri Lanka. In Wang P, Rosati JD, Cheng J, editors, Coastal Sediments 2015: The Proceedings of the Coastal Sediments 2015. World Scientific. 2015 https://doi.org/10.1142/9789814689977_0199