讲座报告 Seminar
[午餐交流会] 第六十五讲:Sedimentary responses to anthropogenic alterations within the Nakdong and Yeongsan Estuaries, South Korea  
Luncheon Seminars #65: Sedimentary responses to anthropogenic alterations within the Nakdong and Yeongsan Estuaries, South Korea
【时间 Time】:2016-10-24 (星期一) 12:20-13:30    【浏览次数 Count】:354   【发布时间 Updated】:2016-10-18
【地点 Venue】:周隆泉楼   A3-206, Zhou Long Quan Bldg
【主讲人 Speaker】:Dr. Joshua R. Williams,NSF Postdoctoral Fellow   
【来访单位 Institution】:Virginia Institute of Marine Science,USA   
【邀请人 Host】:午餐交流会  Steve Kuehl and Fengling Yu      【联络人 Contact】:施薇   Vera Shi, vera_shiwei@xmu.edu.cn

Abstract:

Over the last half-century, the Nakdong and Yeongsan Estuaries of the Republic of Korea (S. Korea) have experienced a wide range of engineered coastal modifications including construction of seawalls, extensive land reclamation, and installation of estuarine dams. Combined, these alterations have considerably modulated the timing and intensity of river discharge, appreciably reduced the tidal prism, prevented natural tidal exchange, modified the shoreline profile, and altered the transport of sediment and organic matter within the coastal zone. Additionally, chronologic reconstructions suggest that rapid industrialization of the region has resulted in a pronounced increase in anthropogenic mercury. In order to assess the sedimentary impacts of these modifications, cores were investigated using 210Pb, 7Be, and 137Cs radioisotope geochronology, laser diffraction particle size analyses, δ13C and δ15N isotope ratio mass spectrometry, total mercury concentration, and X-radiography. Bathymetric, CHIRP seismic, and side-scan sonar data were also utilized to evaluate the spatial distribution of sediments and determine average Holocene sediment accumulation rates. Overall, observations record a shift in depositional environments as a response to an extensive array of anthropogenic alterations. Ultimately, land reclamation and dam construction have severely altered the fate and transport of sediment within these estuarine systems. As a consequence, sedimentation rates have increased dramatically and depositional events occur episodically corresponding to high discharge dam releases.

________________________________________________________

本次午餐会将为报名参加的师生提供午餐,所有午餐会的报名都通过网络进行。请老师同学们访问MEL网页(http://mel.xmu.edu.cn/lecture.asp?id=1),在本次午餐会的报名一栏填写并提交。
本讲座将发布当天仅开放给科研人员、技术人员、博士后、访问学者等教师优先报名,第二天起开放给全体师生报名。学生应在规定时间内报名,如提前以教师的名义报名,将导致报名无效。
本周五下午4点为截止报名时间,总报名人数限制在100名以内。如未及时报上名,可于12:20直接到场听报告。如已报名但因事不能参加,也请在周五下午4点前告知。
午餐会一如既往地欢迎大家的关注,如有兴趣做讲座的老师。欢迎与我们联系。