Abstract
A marina for small crafts is being planned to be built within Caliraya Lake situated at an elevation of 290m above Mean Sea Level (maMSL). Unlike sea-connected water bodies, the water level of Caliraya Lake is largely influenced not by tidal fluctuations, but by the operational water level requirements of the hydroelectric power plant that it caters to. Due to the large difference in the Normal High Water Level (NHWL) and Minimum Operating Level (MOL) of the lake of 2.5m, a floating pontoon marina with guide piles was contemplated to be used. The marina analysis and design approaches implemented in this study considered waves generated by prevailing winds and ship-generated wakes to assess the wave climate and tranquility within the marina. Since the project area is also frequently tracked by typhoons, wind- and pressure-driven storm surges were also used for the vertical siting of the guide piles. Lastly, based on the geographic appearances of the lake shoreline and with the small size of the lake, the fetch limitations resulted to very small wind-generated waves and wind setup considered as wind-driven storm surge components. In comparison to open seas where wind-driven storm surge accounts for approximately 95percent of the total storm surge, the wind-driven storm surge components for the potentially critical historical typhoons which traversed within 200-km radius of the project area only generated 10-30percent of the total storm surge considered for the vertical siting.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/m-XEEw6r99g
Highlights
A marina for small craft vessels is being proposed to be built in Caliraya Lake situated about 290m above Mean Sea Level
Based on the hydroelectric power plant operations, the normal high water level (NHWL) requirement of the power plant is published at 288maMSL while the minimum operating level (MOL) is set at 285.5maMSL
This paper presents the analyses and hydraulic design of a lacustrine marina primarily focusing on wave climate and vertical siting requirements
Summary
A marina for small craft vessels is being proposed to be built in Caliraya Lake situated about 290m above Mean Sea Level (maMSL). The water level of Caliraya Lake is not influenced by tidal fluctuations but instead by operational requirements of the hydroelectric power plant that it supplies. Hydrologic parameters such as rainfall, river runoff and evaporation affect the lake water level. Hydraulic structures such as the Caliraya Dam – with crest elevation at +292maMSL – and Caliraya Spillway help to regulate lake water levels. Due to the large water level fluctuation (2.5m), a floating marina structure instead of a bed-fixed type is proposed. The floating marina will consist of pontoon elements with guide piles to provide lateral stability to the overall structure
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