Field Measurement and Numerical Modeling of Tidal Current in Larantuka Strait for Renewable Energy Utilization

Abstract

ABSTRACT:The amount of electricity consumed is growing rapidly, along with population growth and technological development. Meanwhile, Indonesia's energy supply is predominantly supported by nonrenewable sources, so an approach to renewable energy is urgently needed. This study uses a numerical model to determine the potency of tidal current power at Larantuka Strait, East Nusa Tenggara Province, Indonesia. The output of the study is the electricity generated with a conversion device at several locations. The numerical model is generated using MIKE 3. In order to validate the numerical model, field measurements are conducted to obtain the detailed bathymetry, tidal surface elevation, and tidal current velocity data. The numerical model shows good agreement with the field measurement data; the average errors of tidal surface elevation and tidal current velocity are 4.04 and 9.79%, respectively. Furthermore, the tidal current model is analyzed and two potential sites are found at the narrowest part of the strait. The generated power is calculated for a D10 Sabella turbine. The calculation shows that the amounts of power generated are 522.972 and 324.12 MWh for the two sites, respectively, in 2014. The study shows that Larantuka Strait is very promising and suitable as a site for a tidal current power plant with its tidal current and water depth. A detailed analysis, including financial, navigation, and environmental studies, needs to be conducted to present the feasibility of the realization.

Potential Hydrodynamic Impacts and Performances of Commercial-Scale Turbine Arrays in the Strait of Larantuka, Indonesia

“…Another detailed analysis concerning the tidal stream resources of the strait, utilizing state-of-the-art modeling tools and field measurements, has been provided by Ajiwibowo et al (2017) [14]. Ajiwibowo et al (2017) agree with the results provided by Orhan et al (2017) and provide a more detailed understanding of the renewable electricity generation potential in the strait. Therefore, the strait is of commercial interest [15], and the energy hotspot of the strait, encompassing an area around 3 km 2 , provides enough space for ORE development.…”

“…The chosen time steps correspond to a maximum Courant-Friedrichs-Lewis criterion of around 0.5 for both models. Earlier studies concerning the Strait of Larantuka [11,12,14,15] present the tidal current energy potential of the strait through the simulations covering a monthly period. This study mainly aims at analyzing the changes occurring in the flow field with increasing turbine array capacities, as well as wake characteristics and performances of tidal turbines.…”

“…Hence the Strait of Larantuka was proven suitable for the deployment of second generation tidal stream technologies, which are assumed to be capable of exploiting currents with peak spring flows above 2 m/s [13]. Another detailed analysis concerning the tidal stream resources of the strait, utilizing state-of-the-art modeling tools and field measurements, has been provided by Ajiwibowo et al (2017) [14]. Ajiwibowo et al (2017) agree with the results provided by Orhan et al (2017) and provide a more detailed understanding of the renewable electricity generation potential in the strait.…”

The Effect of Gate Existence at L Islandon The Seabed Profile Due to Reclamation of Jakarta Bay

“…FIELD MEASUREMENT To provide accurate physical conditions at the study location, bathymetric, sea water surface elevation, and tidal current surveys were carried out. These similar surveys were also conducted in several previous studies [16][17][18].…”

“…The validity level  of the model is calculated using Eq. 1, where m  is the value resulted from numerical model, field  is the value obtained from field measurement [16][17][18], and  is the tidal range.…”