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Reply to: “Comment on ‘Lower Bounds to Future Sea-Level Rise” by, John Hunter, Published in International Journal of Ocean and Climate Systems, Volume 4, Issue 4, December 2013, Pp 226–229 回复:“对未来海平面上升下限的评论”,约翰·亨特,《国际海洋与气候系统学报》,2013年12月,第4卷,第4期,第226-229页
Pub Date : 2014-03-01 DOI: 10.1260/1759-3131.5.1.35
A. Parker
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引用次数: 2
Observed Buildup and Collapse of Warm Pool in the Eastern Arabian Sea and Bay of Bengal from Moored Buoy SST Records during 1998–2008 1998-2008年系泊浮标海温记录观测到的东阿拉伯海和孟加拉湾暖池的形成和崩塌
Pub Date : 2014-03-01 DOI: 10.1260/1759-3131.5.1.13
J. Vimala, R. Venkatesan, G. Latha, R. Rao
The observed nature of buildup and collapse of warm pool in the eastern Arabian Sea and the Bay of Bengal is examined with help of sea surface temperature (SST) data collected by NIOT buoy network during the period 1998–2008. During the buildup phase, the SSTs showed a progressive increase in both the eastern Arabian Sea and the Bay of Bengal. During this phase, the amplitudes of the diurnal oscillations of SST are relatively larger in the Bay of Bengal compared to those in the Arabian Sea. During the collapse phase, the SST cooling was dramatic in the eastern Arabian Sean caused by the monsoon onset vortex. Relatively larger amplitude intraseasonal oscillations are seen only in the Bay of Bengal and off the southwest coast of India during the collapse phase.
利用1998-2008年NIOT浮标网收集的海表温度(SST)资料,分析了阿拉伯海东部和孟加拉湾暖池形成和崩塌的观测性质。在积累阶段,海温在阿拉伯海东部和孟加拉湾均呈渐进式增加。在此阶段,孟加拉湾的海温日振荡幅度相对于阿拉伯海的海温日振荡幅度较大。在坍缩期,阿拉伯西海东部的海温因季风涡而急剧降温。在崩塌阶段,只有孟加拉湾和印度西南海岸出现了相对较大的季内振荡。
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引用次数: 4
Experimental and Numerical Investigation on Hydrodynamic Response of Spar with Wind Turbine under Regular Waves 规则波作用下风力机翼梁水动力响应的实验与数值研究
Pub Date : 2013-12-01 DOI: 10.1260/1759-3131.4.4.239
S. Nallayarasu, S. Saravanapriya
The necessity of offshore wind turbines to generate wind power is multifold and well known. The focus of offshore based wind farms are mainly due to abundant availability of unobstructed wind power and land use restriction. Therefore, the development of floating type supports for offshore wind turbines is getting more attention. In this paper the experimental and numerical investigation on the motion response of Spar supporting the wind turbine under regular waves is presented. The experiments were conducted in three stages viz. (a) Spar with stationary wind turbine under regular waves. b) Spar with rotating wind turbine under calm sea conditions. c) Spar with rotating turbine under regular waves. Numerical simulation of the Spar response due to incident waves and the wind turbine torque is carried out using AQWA software. The results obtained from experiments are then compared with that obtained from numerical analysis. The measured Response Amplitude Operator (RAO) compares well with that obtained from numerical analysis. The comparison of measured response and simulated response for wind turbine rotation case shows reasonable match. The combined effect of wind turbine rotation and incident wave on the hull response is 10%, 16% and 32% higher than that of the response due to incident wave alone for heave, surge and pitch responses respectively.
海上风力涡轮机产生风力的必要性是多方面的,也是众所周知的。海上风电场的焦点主要是由于风能的充足可用性和土地使用限制。因此,海上风力机浮式支架的开发越来越受到重视。本文对支撑风力机的桅杆在规则波作用下的运动响应进行了实验和数值研究。实验分三个阶段进行,即(a)固定风力涡轮机在规则波下的桅杆。b)在风平浪静的海况下使用旋转风力涡轮机。c)在规则波下用旋转涡轮机进行桅杆。利用AQWA软件对桅杆在入射波和风力机转矩作用下的响应进行了数值模拟。然后将实验结果与数值分析结果进行了比较。实测的响应幅值算子(RAO)与数值分析结果吻合较好。风力机旋转工况的实测响应与仿真响应比较,结果吻合较好。对于船体的升沉、浪涌和俯仰响应,风力机旋转和入射波对船体响应的综合影响分别比入射波对船体响应的影响高10%、16%和32%。
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引用次数: 12
Teleconnections between Bangladesh Summer Monsoon Rainfall and Sea Surface Temperature in the Indian Ocean 孟加拉夏季风降雨与印度洋海温的遥相关
Pub Date : 2013-12-01 DOI: 10.1260/1759-3131.4.4.231
Md. Mizanur Rahman, M. Rafiuddin, M. Alam
To explore the teleconnections between Bangladesh summer monsoon rainfall (BSMR) and sea surface temperature (SST) anomalies over different parts of the ocean have been examined from the years 1961–2008 (48-year). Global NCEP/NCAR reanalysis data of SST have been used at 2 degree by 2 degree grid in this study. A significant positive correlation (0.44) was found between the BSMR and SST over the southwest Indian Ocean (around 30° S) in the month of February. All other monthly (January to May) correlations were not found to be significant. The SST over the Bay of Bengal was positively correlated with BSMR but not significant. During summer monsoon season the prevailing wind has a south-westerly direction over Bangladesh. The SST over the southwest Indian Ocean is especially important at 30°–36° S latitude and 74°–78° E longitude to develop the linear regression model to predict summer monsoon rainfall in Bangladesh.
为了探讨孟加拉国夏季季风降雨(BSMR)与海洋不同部分的海温(SST)异常之间的远相关关系,研究了1961-2008年(48年)。本研究采用全球NCEP/NCAR海温再分析数据,采用2度× 2度网格。2月份印度洋西南部(30°S左右)的BSMR与海温呈显著正相关(0.44)。其他所有月份(1月至5月)的相关性均不显著。孟加拉湾海温与BSMR呈显著正相关,但不显著。在夏季季风季节,孟加拉国上空的盛行风是西南风。西南印度洋海温在南纬30°-36°和东经74°-78°对建立预测孟加拉国夏季季风降水的线性回归模型尤为重要。
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引用次数: 6
Comment on ‘Lower Bounds to Future Sea-Level Rise’ 关于“未来海平面上升的下限”的评论
Pub Date : 2013-12-01 DOI: 10.1260/1759-3131.4.4.227
J. Hunter
The paper Lower Bounds to Future Sea-Level Rise (Parker, 2013) bears many similarities to an earlier one (Parker et al., 2013). In particular, the first pair of equations in both papers are almost identical and wrong, as pointed out by Hunter (2013). In addition, a crucial statement in the Abstract suggests that present observations of sea-level rise show no acceleration and therefore cast doubt on present projections of sea-level rise; this conclusion has previously been shown to be false (Hunter and Brown, 2013). It should be noted that this is by no means a comprehensive exploration of all the possible errors in Parker's paper.
论文《未来海平面上升的下限》(Parker, 2013)与之前的一篇论文(Parker et al., 2013)有许多相似之处。特别是,正如Hunter(2013)指出的那样,两篇论文中的第一对方程几乎完全相同并且是错误的。此外,摘要中的一项重要声明表明,目前对海平面上升的观测没有显示出加速,因此对目前对海平面上升的预估提出了怀疑;这个结论之前被证明是错误的(Hunter and Brown, 2013)。需要指出的是,这绝不是对Parker论文中所有可能的错误的全面探索。
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引用次数: 3
Experimental and Numerical Investigation of Hydrodynamic Response of Spar with Wind Turbine under Random Waves 随机波浪作用下风力机翼梁水动力响应的实验与数值研究
Pub Date : 2013-12-01 DOI: 10.1260/1759-3131.4.4.261
S. Nallayarasu, S. Saravanapriya
In this paper, experimental and numerical investigation on the motion response of Spar with wind turbine subjected to random waves are presented and discussed. The studies were carried out for three different cases: (a) Spar with wind turbine subjected to waves when the turbine blades are in stationary condition; (b) Spar with wind turbine in operating condition under calm sea state; (c) Spar with wind turbine subjected to waves when the turbine blades are in operating condition. The numerical investigation was carried out using hydrodynamic software Ansys AQWA. The influence of the turbine blade rotation on the motion response of the Spar was investigated and the responses of the system under random waves were presented in terms of statistical values. The experimental results and the results obtained from numerical investigation matches reasonably well. The motion response of the system has increased by about 30%, 20% and 25% for surge, heave and pitch respectively, for turbine blades in rotating condition when compared with Spar with wind turbine in stationary condition.
本文介绍并讨论了随机波作用下风力机桁梁运动响应的实验和数值研究。对三种不同的情况进行了研究:(a)风力涡轮机叶片处于静止状态时的波浪作用;(b)风平浪静海况下运行状态下的风轮桅杆;(c)在风机叶片处于工作状态时,与受波浪影响的风机进行桅杆。采用水动力软件Ansys AQWA进行了数值研究。研究了叶片旋转对系统运动响应的影响,用统计值表示了系统在随机波作用下的响应。实验结果与数值模拟结果吻合较好。与静止状态下的Spar风力机相比,旋转状态下叶片的喘振、升沉和俯仰运动响应分别提高了30%、20%和25%左右。
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引用次数: 4
Experimental Studies on Low Crested Rubble Mound, Semicircular Breakwaters and Vertical Wall System 低峰顶碎石丘、半圆形防波堤和垂直墙体系试验研究
Pub Date : 2013-09-01 DOI: 10.1260/1759-3131.4.3.213
Sreenivasa Reddy Kudumula, M. G. Mutukuru
Submerged and low-crested breakwaters have been widely used as wave energy dissipaters along the coastline. Efficiency of the submerged breakwater depends on crest free board, crest width and its permeability. In the present study, interaction of the regular waves with the vertical wall, offshore low-crested rubble mound breakwater and perforated semicircular breakwater is investigated. Wave forces on vertical wall, transmission in the pool and the reflection from combined system are measured. The main aim of the present study is to know the hydrodynamic performance of the low-crested breakwaters. Maximum reduction of wave forces on the vertical wall was observed for zero submergence condition and longer pool length. Performance of semi circular low-crested breakwater was investigated in terms of energy loss coefficient which includes transmission and reflection coefficients.
水下防波堤和低波峰防波堤被广泛应用于海岸线上的波浪能消能。水下防波堤的效率取决于波峰自由板、波峰宽度和其渗透性。本文研究了规则波与垂直墙、近海低峰碎石丘防波堤和穿孔半圆防波堤的相互作用。测量了垂直壁面上的波浪力、池内的透射力和组合系统的反射力。本研究的主要目的是了解低波峰防波堤的水动力性能。在零淹没条件和较长的水池长度下,观察到垂直壁上波浪力的最大减小。从能量损失系数的角度研究了半圆形低波峰防波堤的性能,其中能量损失系数包括穿透系数和反射系数。
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引用次数: 8
Hydrodynamic Response of Tension Leg Platforms with Perforated Members 带孔构件张力腿平台的水动力响应
Pub Date : 2013-09-01 DOI: 10.1260/1759-3131.4.3.181
S. Chandrasekaran, N. Madhavi, S. Sampath
Tension-Leg Platforms (TLPs) are commonly preferred offshore structures for the deep-water oil exploration. Their reduced response to the encountered waves is achieved by their compliancy. This innovative structural design dampens the vertical motion (heave) of the platform but the large horizontal movements (surge, sway and yaw motion) cause inconvenience to the people on board, though the platform remains stable for the operational sea state. Coastal and offshore structures are constructed with the protective perforated layers mainly to reduce the direct impact caused by the waves. Present study highlights the detailed experimental investigations carried out on the scaled model of the TLP with the perforated members under regular waves. Based on the experimental investigations, it is seen that there is a significant reduction in the dynamic response of the TLP with the perforated columns. Encompassing column members with the perforated outer cover is seen as one of the effective method of retrofitting offshore structures to improve their serviceability.
张力腿平台(TLPs)是深水石油勘探的首选海上结构。它们对遇到的波浪的响应减小是由于它们的顺应性。这种创新的结构设计抑制了平台的垂直运动(起伏),但大的水平运动(浪涌、摇摆和偏航运动)会给船上的人带来不便,尽管平台在运行海况下保持稳定。在海岸和近海建筑上设置保护性穿孔层主要是为了减少海浪的直接冲击。本文重点研究了规则波作用下带孔构件的张力腿桥比例模型的详细实验研究。通过试验研究发现,有了穿孔柱后,张力腿桥的动力响应明显减小。用穿孔外盖包裹柱构件被认为是改造海上结构以提高其适用性的有效方法之一。
{"title":"Hydrodynamic Response of Tension Leg Platforms with Perforated Members","authors":"S. Chandrasekaran, N. Madhavi, S. Sampath","doi":"10.1260/1759-3131.4.3.181","DOIUrl":"https://doi.org/10.1260/1759-3131.4.3.181","url":null,"abstract":"Tension-Leg Platforms (TLPs) are commonly preferred offshore structures for the deep-water oil exploration. Their reduced response to the encountered waves is achieved by their compliancy. This innovative structural design dampens the vertical motion (heave) of the platform but the large horizontal movements (surge, sway and yaw motion) cause inconvenience to the people on board, though the platform remains stable for the operational sea state. Coastal and offshore structures are constructed with the protective perforated layers mainly to reduce the direct impact caused by the waves. Present study highlights the detailed experimental investigations carried out on the scaled model of the TLP with the perforated members under regular waves. Based on the experimental investigations, it is seen that there is a significant reduction in the dynamic response of the TLP with the perforated columns. Encompassing column members with the perforated outer cover is seen as one of the effective method of retrofitting offshore structures to improve their serviceability.","PeriodicalId":105024,"journal":{"name":"The International Journal of Ocean and Climate Systems","volume":"305 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115843721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 12
Impact of Diurnal Variation of Winds on Coastal Waves off South East Coast of India 风日变化对印度东南沿海海浪的影响
Pub Date : 2013-09-01 DOI: 10.1260/1759-3131.4.3.171
P. G. Remya, Raj Kumar
The land-sea breeze systems, the most interesting phenomena observed at coastal regions, have significant impact on the costal wave characteristics. Present study also focuses the diurnal variations of winds and its impact on wave parameters like significant wave height and mean wave period off Ennore port located in the south east coast of India The impact of the diurnal variation of winds on complex wave patterns in the coastal regions of Indian Ocean have been addressed earlier also. In the present study an attempt has been made to explore the impact of diurnal variation of winds on coastal waves using numerical model forced with European Centre for Medium Range Weather Forecasts (ECMWF) and National Centre for Environmental Prediction (NCEP) blended wind fields. It has been observed that most of the time, the ECMWF blended wind field reproduces the diurnal variation.
陆海风系统是在沿海地区观测到的最有趣的现象,它对海岸波的特性有重要的影响。本文还研究了风的日变化及其对印度东南海岸埃诺尔港外显著波高和平均波周期等波浪参数的影响。风的日变化对印度洋沿海复杂波浪型的影响也已在前面讨论过。本研究利用欧洲中期天气预报中心(ECMWF)和国家环境预报中心(NCEP)混合风场强迫的数值模式,探讨了风的日变化对海岸波的影响。观察到,在大多数情况下,ECMWF混合风场再现了日变化。
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引用次数: 7
Lower Bounds to Future Sea-Level Rise 未来海平面上升的下限
Pub Date : 2013-09-01 DOI: 10.1260/1759-3131.4.3.197
A. Parker
Many recent papers claim that the climate model-based projections made until the Fourth Assessment Report (AR4) of the Intergovernmental Panel on Climate Change (IPCC) yielding a 21st century rise spanning nearly 20–60 cm are likely to underestimate sea-level change in response to rapid climatic variations. These authors project the sea-level rise of 2100 and beyond with semi-empirical methods coupled to a simple climate model finding that sea level is predicted to rise by at least ∼ 80 cm at the end of this century and is expected to continue rising for at least the next two hundred years. It is pointed out in this comment that there has been so far no sign in any measured quantity of the positive acceleration predicted by the climate models since the 1990 and the lower bounds to sea level rises in the next few decades in every worldwide location are therefore simply the continuation of the linear trend locally measured up to present.
最近的许多论文声称,在政府间气候变化专门委员会(IPCC)第四次评估报告(AR4)之前所做的基于气候模型的预测表明,21世纪海平面将上升近20-60厘米,这可能低估了海平面因快速气候变化而发生的变化。这些作者用半经验方法结合一个简单的气候模型预测了2100年及以后的海平面上升,发现海平面预计在本世纪末至少上升~ 80厘米,预计至少在未来200年将继续上升。在这篇评论中指出,迄今为止,在任何测量量中都没有迹象表明自1990年代以来气候模式预测的正加速,因此,未来几十年世界各地海平面上升的下限只是当地测量到目前为止的线性趋势的延续。
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引用次数: 11
期刊
The International Journal of Ocean and Climate Systems
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