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Assessing organic matter sources in Lake Shihwa based on a multi-element stable isotope approach

Title
Assessing organic matter sources in Lake Shihwa based on a multi-element stable isotope approach
Other Titles
안정동위원소를 활용한 시화호 유기물 기원 연구
Author
Dahae Kim
Alternative Author(s)
김다해
Advisor(s)
신경훈
Issue Date
2017-08
Publisher
한양대학교
Degree
Master
Abstract
Recently, due to the increase of industrial and residential complexes and agricultural activities, the input of organic compounds and nutrients from land has grown continuously, resulting the deterioration of water quality. An artificial lake Shihwa, one of the most polluted coastal areas of the country, has been also steadily affected by the effects of human activities from surrounding lands and streams such as Shingil and Gunja inflowing into the lake. In this study, we determined the origin of organic matter based on multi-elements (C, N and O) stable isotope approach and quantify the relative contribution of OM sources (rural, urban and industrial area) on sedimentary OM in Lake Shihwa using IsoSource model. Also, we assessed the influence of various organic matter sources deposited lake sediment in Lake Shihwa from industrial, urban, rural area and reed wetland using the compound specific (n-alkane) isotope analysis. In the view of relative source contributions, the reed wetland derived organic matter have the largest portion on sedimentary organic matter in Lake Shihwa in 2012 and 2016. In addition, we confirmed that the operation of tidal power plant has been changing the source of n-alkanes from in-situ production to allochthonous sources. In 2009, before the operation of tidal power plant, the contribution from anoxic bacterial sources was dominant. Whereas, after the operating tidal power plant, improvements of circulation of water column occurs in lake, resulting the dominance of terrestrial n-alkane sources with the differences in their stable carbon isotopes between before and after the operating tidal power plant. This result obtained in this study is expected to be useful for monitoring of water quality and various sources inflowing to Lake Shihwa.
URI
http://hdl.handle.net/20.500.11754/33706http://hanyang.dcollection.net/common/orgView/200000430868
Appears in Collections:
GRADUATE SCHOOL[S](대학원) > MARINE SCIENCES AND CONVERGENT TECHNOLOGY(해양융합과학과) > Theses (Ph.D.)
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