NDLI: Effect of inlet morphometry changes on natural sensitivity and flushing time of the Koggala lagoon, Sri Lanka

Content Provider	Springer Nature Link
Author	Gunaratne, G. L. Tanaka, N. Amarasekara, P. Priyadarshana, T. Manatunge, J.
Copyright Year	2012
Abstract	The changes of natural sensitivity in terms of lagoon morphometry, particularly the inlet morphometry and flushing properties of the Koggala lagoon, Sri Lanka, are presented in this paper. The morphometric assessment is based on analysis and consideration of morphometric characteristics for three scenarios of the lagoon, namely: (1) before the construction of the old groyne system or time period before 1996 (Koggala Scenario 1—KS1); (2) existing situation or time period after 2007 (Koggala Scenario 2—KS2); and (3) future scenario with respect to proposed groyne interventions for the mouth width of 20 m, as proposed by Gunaratne et al. (J Environ Sci 22(6):813–819, 2010) (Koggala Scenario 3—KS3). The morphometric assessment provides a simple means of defining natural sensitivity or vulnerability of individual scenarios of Koggala lagoon to external loads and anthropogenic activities. We found that KS1 and KS3 scenarios are relatively more sensitive than KS2, whereas KS1 has the highest natural sensitivity, and KS2 has the lowest natural sensitivity or the most robust conditions. In quantifying the tidal flushing of Koggala lagoon, the concept of flushing half-life (T $_{50%}$ h) was adapted as the optimum measure of flushing time. Flushing half-life was calculated for KS2 and KS3 scenarios. The flushing half-life ranges from 9 to 37 h (1.5 days) for KS2 and from 12 to 72 h (3 days) for KS3. Flushing half-life suggests that the exchange rate between the lagoon and the ocean is controlled by the balance between fresh water inflow and the seawater inflow. Applications of the morphometric classification and flushing half-life presented in this article can be used to help guide management and policy-making decisions for the coastal environment of Koggala lagoon and other coastal water bodies of Sri Lanka.
Starting Page	87
Ending Page	97
Page Count	11
File Format	PDF
ISSN	18601871
Journal	Landscape and Ecological Engineering
Volume Number	10
Issue Number	1
e-ISSN	1860188X
Language	English
Publisher	Springer Japan
Publisher Date	2012-02-17
Publisher Place	Tokyo
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Lagoon morphometry Coastal lagoons Morphometric classification Landscape Ecology Nature Conservation Civil Engineering Environmental Management Landscape/Regional and Urban Planning Plant Ecology
Content Type	Text
Resource Type	Article
Subject	Ecology Management, Monitoring, Policy and Law Nature and Landscape Conservation

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