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Title: Evaluation of proposed channel on circulation and morphology change at Kawaihae Habor and Pelekane Bay, Island of Hawaii
Authors: Li, Honghai
Brown, Mitchell E.
Smith, Thomas D.
Podoski, Jessica H.
Keywords: Circulation model
Coastal inlets
Coastal Modeling System (CMS)
Morphology change
Sediment transport
Coastal Inlets Research Program (U.S.)
Publisher: Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (Engineer Research and Development Center (U.S.)); no.ERDC/CHL TR-09-19
Abstract: This study was conducted as a joint effort between the U.S. Army Engineer District, Honolulu; the State of Hawaii Department of Transportation, Harbors Division; and the Coastal and Hydraulics Laboratory (CHL), U.S. Army Engineer Research and Development Center, to examine the consequences of creating a new circulation channel connecting Kawaihae Deep Draft Harbor to Pelekane Bay. The study site is located on the western side of the island of Hawaii. The concept of the channel was proposed to increase water circulation, promote sediment removal, and improve water quality in the bay. The coupled wave, flow, and sediment transport model available in the Coastal Modeling System (CMS), developed by the Coastal Inlets Research Program at CHL, was applied as the main analysis method in this study. Numerical simulations with the CMS were forced with wave parameters from Wave Information Study Pacific Station 113. Sensitivity tests revealed that wave forcing is dominant, and that tidal forcing and wind forcing are secondary in the study area. Four channel alternatives were constructed for a 15-day (non-storm) and a 6-month (winter storms) simulation with the CMS. The modeling analysis involved predicting channel performance, assessing change in water circulation in response to waves and hydrodynamics, and examining potential sediment transport and morphology change in the vicinity of the channel. Simulation results indicate that consistent wave setup occurs in Pelekane Bay, as compared to within Kawaihae Harbor, and plays a decisive role in determining the direction and magnitude of the flow in the proposed channel. Along-channel flow is predominantly directed from Pelekane Bay to Kawaihae Harbor and is capable of mobilizing and transporting sand from Pelekane Bay to the mouth of and inside the proposed channel. Channel blockage occurred for the four channel alternatives before the end of the 6-month winter simulation, indicating that at least annual maintenance of the channel will be required. Based on the findings in the study, implementation of the circulation channel is not recommended.
Description: Technical Report
Gov't Doc #: ERDC/CHL TR-09-19
Rights: Approved for public release; distribution is unlimited
Appears in Collections:Technical Report
Technical Report

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