Basic morphology and morphometry of Lake Danao in Ormoc City, Leyte, the Philippines
2024
de la Cruz, J.O. | Romero, J.B. | Amistoso, A.F.G.N. | Romero, V.M. II | Lama, M.T. | Daal, R.M.S. | Gerona-Daga, M.E.B. | Tabornal, R.U.
Information on the morphology and morphometrics of Lake Danao an integral part of the Lake Danao Natural Park in Ormoc City, Leyte, the Philippines is incomplete and obsolete, which necessitates validation and updating. To address this gap, GIS, ground truthing, and bathymetric surveys using modern methods and technology alongside classical computing approaches were conducted in July 2022 to verify the accuracy and provide supplementary information to the lake's existing basic morphometrics compiled from various sources. The results revealed a maximum length of 2,962 m, a maximum width of 825 m, and a shoreline length of 8.23 km. The relative depth (6.43%) and basin permanence index (6.83) demonstrated the lake's extensive depth (maximum = 85.8 m). Using the frustum volume formula, Lake Danao is estimated to hold a maximum of approx 56,214,143.56 cu m of water. The calculated surface area is 1,398,300 sq m, 5.4% smaller than the previously published area of 1,480,000 sq m by NAMRIA [National Mapping and Resource Information Authority] in 1956. Additional studies are needed to confirm if this discrepancy is due to limitations in previous mapping techniques or indicative of actual area shrinkage. Local authorities can use these findings to update Lake Danao's basic morphology and morphometrics information and conduct further research. However, cautious application of the results is necessary when drafting conservation and management strategies for the sustainable development of the protected area.
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