Spatio-temporal changes during the last twelve year period (2006–2017) and their impacts on ecological and socio-economic status of Dondra lagoon, southern coast of Sri Lanka were studied as many lagoons in southern Sri Lanka are being seriously affected due to anthropogenic pressure in the recent past. The changes of Dondra lagoon and its immediate surroundings were studied in conjunction with a GIS-coupled ecological survey and a questionnaire survey. The lagoon water surface area has decreased by about 0.92 ha (~8%) and the mangrove cover has increased by about 1.38 ha (~11%) over this period. The salinity of the lagoon has also reduced, forming a ‘low saline’ (3 psu) regime. About 40% of the lost water surface has scarified for a newly formed land mass (~0.4 ha) within the proximal part of the lagoon. The bridge, broken by the tsunami of 2004, has newly been constructed twice during the reporting period. The construction most likely led to impair the inflow and outflow through the lagoon mouth. Several development projects were launched in the immediate periphery of the lagoon stimulated soil erosion causing heavy siltation in the lagoon. The above changes in the morphometry of the lagoon is a cumulative effect of two factors; impaired inflow and outflow through the lagoon mouth, and the increase of the sediment input to the lagoon. If the ongoing processes are sustained, the lagoon will change into a different landscape. Therefore, early intervention to restore the lagoon hydrology is highly recommended if the lagoon ecosystem is to be protected.

中文翻译：

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海啸影响和海啸后发展导致的Dondra泻湖（2006–2017）变化的回顾性研究

研究了过去十二年间（2006-2017年）的时空变化及其对斯里兰卡南部海岸Dondra泻湖的生态和社会经济状况的影响，因为斯里兰卡南部许多泻湖由于人为因素而受到严重影响最近的压力。结合GIS结合的生态调查和问卷调查研究了Dondra泻湖及其周围环境的变化。在此期间，泻湖水表面积减少了约0.92公顷（约8％），红树林覆盖面积增加了约1.38公顷（约11％）。泻湖的盐度也降低了，形成了“低盐分”（3 psu）状态。泻湖近端部分新形成的陆地（约0.4公顷）流失了约40％的失水表面。这座桥因2004年的海啸而折断，在报告期内新建造了两次。这种构造最有可能导致通过泻湖口的流入和流出受到损害。在泻湖的周边启动了几个开发项目，这刺激了土壤侵蚀，导致泻湖中大量淤积。泻湖形态的上述变化是两个因素的累积影响。通过泻湖口的流入和流出受到损害，并且沉积物输入到泻湖的数量增加。如果持续进行下去，泻湖将变成不同的景观。因此，如果要保护泻湖的生态系统，强烈建议尽早进行干预以恢复泻湖的水文。这种构造最有可能导致通过泻湖口的流入和流出受到损害。在泻湖的周边启动了几个开发项目，这刺激了土壤侵蚀，导致泻湖中大量淤积。泻湖形态的上述变化是两个因素的累积影响。通过泻湖口的流入和流出受到损害，并且沉积物输入到泻湖的数量增加。如果持续进行下去，泻湖将变成不同的景观。因此，如果要保护泻湖的生态系统，强烈建议尽早进行干预以恢复泻湖的水文。这种构造最有可能导致通过泻湖口的流入和流出受到损害。在泻湖的周边启动了几个开发项目，这刺激了土壤侵蚀，导致泻湖中大量淤积。泻湖形态的上述变化是两个因素的累积影响。通过泻湖口的流入和流出受到损害，并且沉积物输入到泻湖的数量增加。如果持续进行下去，泻湖将变成不同的景观。因此，如果要保护泻湖的生态系统，强烈建议尽早进行干预以恢复泻湖的水文。泻湖形态的上述变化是两个因素的累积影响。通过泻湖口的流入和流出受到损害，并且沉积物输入到泻湖的数量增加。如果持续进行下去，泻湖将变成不同的景观。因此，如果要保护泻湖生态系统，强烈建议尽早进行干预以恢复泻湖水文。泻湖形态的上述变化是两个因素的累积影响。通过泻湖口的流入和流出受到损害，并且沉积物输入到泻湖的数量增加。如果持续进行下去，泻湖将变成不同的景观。因此，如果要保护泻湖的生态系统，强烈建议尽早进行干预以恢复泻湖的水文。