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WAN Yong,ZHANG Jie,MENG Junmin,WANG Jing. 2015. Exploitable wave energy assessment based on ERA-Interim reanalysis data—A case study in the East China Sea and the South China Sea. Acta Oceanologica Sinica, 34(9):143-155
Exploitable wave energy assessment based on ERA-Interim reanalysis data—A case study in the East China Sea and the South China Sea
基于ERA-Interim数据的可开发利用波浪能资源评估研究——以中国东海南海为例
Received:October 21, 2014  Revised:February 04, 2015
DOI:10.1007/s13131-015-0641-8
Key words:wave energy assessment  ERA-Interim reanalysis data  exploitable wave energy  theoretical wave energy  wave power density  high sea state
中文关键词:  波浪能资源评估  ERA-Interim再分析数据  可开发波能资源  理论波能资源  波功率密度  高海况
基金项目:
Author NameAffiliationE-mail
WAN Yong College of Information Science and Engineering, Ocean University of China, Qingdao 266100, China
First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
College of Information and Control Engineering, China University of Petroleum, Qingdao 266580, China 
 
ZHANG Jie First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China  
MENG Junmin First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China  
WANG Jing College of Information Science and Engineering, Ocean University of China, Qingdao 266100, China wjing@ouc.edu.cn 
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Abstract:
      Wave energy resources assessment is a very important process before the exploitation and utilization of the wave energy. At present, the existing wave energy assessment is focused on theoretical wave energy conditions for interesting areas. While the evaluation for exploitable wave energy conditions is scarcely ever performed. Generally speaking, the wave energy are non-exploitable under a high sea state and a lower sea state which must be ignored when assessing wave energy. Aiming at this situation, a case study of the East China Sea and the South China Sea is performed. First, a division basis between the theoretical wave energy and the exploitable wave energy is studied. Next, based on recent 20 a ERA-Interim wave field data, some indexes including the spatial and temporal distribution of wave power density, a wave energy exploitable ratio, a wave energy level, a wave energy stability, a total wave energy density, the seasonal variation of the total wave energy and a high sea condition frequency are calculated. And then the theoretical wave energy and the exploitable wave energy are compared each other; the distributions of the exploitable wave energy are assessed and a regional division for exploitable wave energy resources is carried out; the influence of the high sea state is evaluated. The results show that considering collapsing force of the high sea state and the utilization efficiency for wave energy, it is determined that the energy by wave with a significant wave height being not less 1 m or not greater than 4 m is the exploitable wave energy. Compared with the theoretical wave energy, the average wave power density, energy level, total wave energy density and total wave energy of the exploitable wave energy decrease obviously and the stability enhances somewhat. Pronounced differences between the theoretical wave energy and the exploitable wave energy are present. In the East China Sea and the South China Sea, the areas of an abundant and stable exploitable wave energy are primarily located in the north-central part of the South China Sea, the Luzon Strait, east of Taiwan, China and north of Ryukyu Islands; annual average exploitable wave power density values in these areas are approximately 10-15 kW/m; the exploitable coefficient of variation (COV) and seasonal variation (SV) values in these areas are less than 1.2 and 1, respectively. Some coastal areas of the Beibu Gulf, the Changjiang Estuary, the Hangzhou Bay and the Zhujiang Estuary are the poor areas of the wave energy. The areas of the high wave energy exploitable ratio is primarily in nearshore waters. The influence of the high sea state for the wave energy in nearshore waters is less than that in offshore waters. In the areas of the abundant wave energy, the influence of the high sea state for the wave energy is prominent and the utilization of wave energy is relatively difficult. The developed evaluation method may give some references for an exploitable wave energy assessment and is valuable for practical applications.
中文摘要:
      波浪能资源评估是波浪能资源开发利用之前的一项重要工作,现有的波浪能资源的评估研究工作主要分析的是研究海域理论波浪能资源的状况,对于可开发波浪能资源状况的研究很少,高海况和较低海况下的波浪能资源是不可开发的,需要加以消除。针对这种情况,本文以中国东海和南海为例,首先,研究了理论波能资源和可开发波能资源的划分依据;然后,利用近20年ERA-Interim海浪场数据,通过波功率密度(Pw)的时空分布、波能资源的可利用率、波能能级频率、波能稳定性、总波能密度、总波能量的季节变化、高海况的影响程度等指标,对比分析了理论波能资源和可开发波能资源;评估了可开发波能资源的分布状况;对可开发波能资源进行了区域划分;评价了高海况的影响。研究表明:考虑海况破坏力的实际情况以及波浪能的利用效率,确定可开发波能资源是1m≤Hs≤4m的波浪携带的能量;可开发波能资源和理论波能资源相比,平均波功率密度、能级频率、总波能密度和总波能量均有明显的下降,波能的稳定性有所提高,二者有明显的差异;在东海南海海域,可开发波能资源丰富且稳定的区域主要位于南海中北部、吕宋海峡、台湾东部海域、琉球群岛北部海域,年均可开发波能的Pw约为10-15kW/m,可开发波能的年变化指数(COV)和季节变化指数(SV)分别小于1.2和1。北部湾、长江口、杭州湾、珠江口近岸海域是波浪能资源的贫乏区;波能资源利用率高的区域主要集中在近岸,近岸波浪能资源受高海况的影响要明显小于离岸较远的海域。在波浪能资源较为丰富的区域,高海况的影响较大,波能资源的利用有一定的难度。
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