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4 result(s) for "东海沿岸"
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Effects of tide-surge interactions on storm surges along the coast of the Bohai Sea, Yellow Sea, and East China Sea
A two-dimensional coupled tide-surge model was used to investigate the effects of tide-surge interactions on storm surges along the coast of the Bohai Sea, Yellow Sea, and East China Sea. In order to estimate the impacts of tide-surge interactions on storm surge elevations, Typhoon 7203 was assumed to arrive at 12 different times, with all other conditions remaining constant. This allowed simulation of tide and total water levels for 12 separate cases. Numerical simulation results for Yingkou, Huludao, Shijiusuo, and Lianyungang tidal stations were analyzed. Model results showed wide variations in storm surge elevations across the 12 cases. The largest difference between 12 extreme storm surge elevation values was of up to 58 cm and occurred at Yingkou tidal station. The results indicate that the effects of tide-surge interactions on storm surge elevations are very significant. It is therefore essential that these are taken into account when predicting storm surge elevations.
夏季东海陆架区悬浮体有效密度分布及其影响因素
依据2012年6-7月在东海陆架区所取得的悬浮体、温度、盐度和叶绿素资料,探讨了该区悬浮体有效密度的分布特征及其影响因素。结果表明,研究区的悬浮体有效密度总体上表现为近岸低、外海高的分布特征。随深度的增加,近岸海域悬浮体有效密度逐渐增大,底层水体较上层水体呈现为高值;外海区悬浮体有效密度则相对稳定,底层水体较上层水体呈现为低值。研究区悬浮体有效密度的空间分布主要受到长江冲淡水、浙江沿岸上升流和海底沉积环境的影响,其中长江冲淡水和浙江沿岸上升流对该区的\"叠加\"影响是主要因素。
关于《东海内陆架泥质沉积反映的古环境演化》的几点商榷
闽浙沿岸泥质沉积因其具有相对稳定的沉积动力条件、高的沉积速率等特点,近年来受到沉积学研究者们的关注,并在沉积通量、物质来源、地球化学特征及古环境记录等方面逐渐取得了一些认识^[1-6]。最近,王可等^[7](王可等,2008.东海内陆架泥质沉积反映的古环境演化.海洋地质与第四纪地质,
东海闽浙沿岸泥质区沉积特征与古环境记录
2007-2009年执行\"我国近海海洋综合调查与评价\"专项过程中,对东海闽浙沿岸泥质区进行了系统的底质调查,取得表层沉积物样品2 949个、柱状沉积物样品148个。基于上述样品的研究,得到以下认识:(1)以6.5 Φ粒径为界线详细划分出泥质区的分布范围,主要位于26°~29°N之间,水深90 m以浅的区域。(2)粒径趋势分析结果表明泥质区现代沉积物总体趋势是由东北向西南运移,但研究区的两侧又稍有不同,均表现出明显的向外偏转趋势;南部闽江河口外沉积物运移模式大致表现为由河口向周围呈散射状的输运趋势,最北影响可到27°N附近。(3)泥质区黏土矿物可明显划分为2个组合区,Ⅰ区覆盖了从长江口到南部闽江口外的大片海域,富集伊利石(平均含量为64%),沉积物主要来自于长江;Ⅱ区主要集中在闽江口附近的小区域,富集高岭石和绿泥石(两者平均含量之和为50%),推断其沉积物可能主要来自于闽江。(4)常量元素的R型因子分析表明闽浙沿岸泥质区沉积主要以陆源碎屑沉积为主,伴有少量生物沉积。(5)利用210Pb法测试了研究区百年来沉积速率,结果表明闽浙沿岸泥质区近百年来沉积速率介于0.79~3.34 cm/a之间,平均值为1.97 cm/a,属于东海次高沉积强度区,明显低于长江口泥质区沉积速率。(6)对闽浙沿岸泥质区南部的MZ01孔进行了综合分析,恢复了中全新世以来泥质区的古环境演变过程,识别出10次极值事件,可能主要由东亚冬季风的增强所引起,推测中全新世以来泥质区东亚冬季风演化过程大致可以分为4个阶段:8 400~6 300 aBP为季风较强且波动期、6 300~3 800 aBP为季风较弱且稳定期、3 800~1 400 aBP为季风高波动期、1 400 aBP以来为季风稳定增强期。