• Title, Summary, Keyword: 곰소만

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Mass Balance of Salts, DIP, DIN and DON in the Gomso Tidal Flat (곰소만 조간대에서 Salts, DIP, TDN의 물질 수지)

  • Jeong Yong-Hoon;Kim Yeong-Tae;Kim Ki-Hyun;Kim Soh-Young;Kim Byung-Hoon;Yang Jae-Sam
    • The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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    • v.11 no.2
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    • pp.68-81
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    • 2006
  • As one of the on-going projects to investigate the biogeochemical characteristics of tidal flat, we develop seasonal mass balance calculations (or DIP, DIN and DON in Gomso Bay. We have obtained 13-hours time-series data of salinity, tidal current, nutrients, and chlorophyll-a of seawater for spring, dry summer, rainy summer and winter during $1999{\sim}2000$. DIP of $-1.10{\times}10^6g\;P\;day^{-1},\;-4.50{\times}10^5g\;P\;day^{-1}$ was out-fluxed from the bay to the bay proper for spring and dry summer, respectively. Whereas $1.06{\times}10^4g\;P\;day^{-1}$ of net influx of DIP was found during winter and $2.72{\times}10^6g\;P\;day^{-1}$ of net influx was also found during the rainy summer. Therefore we suggest the role of Gomso tidal flat as a source of DIP fur the seasons of spring and summer, but as an opposite role during the rainy summer and winter but much smaller in magnitude. Except winter, the advection process by tidal current is found the most dominant flux among the diverse fluxes of DIP in the bay. Whereas ground water is estimated as the strongest flux of TDN except winter. TDN of $1.38{\times}10^7g\;N\;day^{-1},\;2.45{\times}10^6g\;N\;day^{-1},\;and\;4.65{\times}10^7g\;N\;day^{-1}$ was in-fluxed to the bay from the bay proper far spring, rainy summer and summer, respectively. Only $-1.70{\times}10^7g\;N\;day^{-1}$ of net out-flux was found during the winter. Therefore we suggest the role of Gomso tidal flat as a sink of TDN far the year round except winter.

Long-term Variation of Tidal-flat Sediments in Gomso Bay, West Coast of Korea (곰소만 조간대 퇴적물의 장기적 변화)

  • Chang, Jin-Ho;Ryu, Sang-Ock;Jo, Yeong-Jo
    • Journal of the Korean earth science society
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    • v.28 no.3
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    • pp.357-366
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    • 2007
  • In Gomso Bay, on the west coast of Korea, the surface sediments sampled in 1991 and 2006 were analysed to identify the long-term variations of tidal flat sediments. Silt and clay contents have decreased in the bay-mouth tidal flats whereas sand and clay contents have decreased on the inner-bay and bay-head tidal flats over the last 15 year period. In particular, the clay contents of the tidal flats in 2006 were relatively low when compared to those of both tidal flats adjacent to other semi-enclosed bays and those of the tidal flats in 1991. The variations of textural compositions in the tidal flat sediments have led to changes of the sedimentary facies. It indicates that the changes must have been made by the changes of hydrodynamic conditions impacted by human activities, such as the construction of sea-walls, land reclamation, structures of farms constructed compactly near the low water line, and the Saemangeum dyke constructed in the northern part of the area where this research was conducted.

곰소만 조간대 바지락형성 장소의 지형학적 특성과 하르팍티쿠스 요각류의 분포

  • 이인태;전승수;서해립;서호영;손창수;선서경
    • Proceedings of the Korean Society of Fisheries Technology Conference
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    • pp.251-252
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    • 2001
  • 현재 곰소만에는 크고 작은 111개의 바지락 양식장 (98년 기준)이 허가되어 있는 곳으로 우리나라 바지락 총생산의 약 30%를 차지하는 대표적인 바지락 생산지이다. 그런데 곰소만의 경우, 바지락 양식장의 모든 위치는 만의 중앙부를 기준으로 모두 동쪽에 분포하고 있다. 이러한 사실은 바지락 양식장이 어떤 지형적 특징에 의존하고 있음을 시사한다 (이 등, 2001). 본 연구에서는 곰소만의 지형 특징을 토대로 그곳에서의 퇴적작용을 이해한 후, 지형적으로 구분되는 대표적인 곳에서 중형저서생물인 하르팍티쿠스 요각류의 분포를 조사하여 바지락형성 장소의 지형학적ㆍ생물학적 특성을 고찰하였다. (중략)

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Tidal Flats and Resident Life : The Case of Bay, Gomso Bay, Youngwang Tidal Flat (서해안 갯벌과 주민 생활 -가로림만, 곰소만, 영광 갯벌을 사례로-)

  • Lee, Yun-Hwa
    • Journal of the Korean association of regional geographers
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    • v.12 no.3
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    • pp.339-351
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    • 2006
  • The purpose of this study is to investigate and analyze the relationships between tidal cycles, surface landforms, and sediments of tidal flats and their resident life. The study areas are Uengdo Ri in the Garolim Bay with wide the mud flat, Doou Ri in the Youngwang tidal flat which is developed sand flat and salt field, and Gomso Bay which is developed aquaculture industry. For resident around tidal flats, sea working takes precedence over farming, and main earnings gets from tidal flats. Resident life around the tidal flats is deeply related to tidal cycles, and low water level of spring tide becomes, they are most active and get more earnings than usual day, so it seems to be periodic markets. It is usually developed shellfish aquafarms in the mud flat, the stow net fishery in the sand flat, and salt fields in the mixed flat near the coast. Also a tidal flat has specialization of economic activity, and is divided into salt field and fish-farming in the supratidal zone, shellfish aquafarm in the intertidal zone, and oyster and porphyra culture in the subtidal zone.

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The Distribution of phosphorus in the Gomso Bay Tidal Flat (곰소만 조간대에서 인의 시공간적 분포)

  • 양재삼;김영태
    • The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY
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    • v.7 no.3
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    • pp.171-180
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    • 2002
  • The temporal and spatial distributions of phosphorus have been investigated in the Gomso Bay, Korea. TP, PIP, TOP and DIP in sediment were found 548.8mg P kg$^{-1}$ , 426.1mg P kg$^{-1}$ , 122.6mg P kg$^{-1}$ , and 0.217mg P kg$^{-1}$ , respectively with a decreasing order of PIP>TOP>DIP. Any temporal or spatial trend has not been found on the distribution of TP in the sediment, except the high TP values near the mouth of Julpo-chun. We found seasonal patterns high TOP(28.90% of TP) and low TIP(71.10% of TP) in August, but low TOP(15.63% of TP) and high TIP(84.38% of TP) in November. There were three times higher DIP concentration in August than in November. Such case is probably not only due to the enhanced supply of DIP directly from the decomposition of organic matter from overlying water in summer, but also the released phosphate from the adsorbed particulate matter such as PIP under the low pH and Eh conditions at the subsurface layers of the sediment induced by the active microbial respiration of increased organic materials in summer. Primarily, the source of phosphorous from municipal sewage strongly influenced the early stage of the distribution of all the phosphorous in the Gomso tidal flat. Notwithstanding, through the processes of diagenesis in sediment, water temperature and organic contents probably functioned as the key parameters to control the temporal distributions of TOP, TIP and DIP in the Gomso tidal flat.

Role of Sand Shoal in the Intertidal Flat Sedimentation, Gomso Bay, Southwestern Korea (서해 곰소만 조간대 퇴적작용에서 모래톱의 역할)

  • Lee, In-Tae;Chun, Seung Soo
    • Journal of the Korean earth science society
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    • v.22 no.2
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    • pp.120-129
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    • 2001
  • A sand shoal (1300 m long and 400 m wide) with an orientation of north-south is formed on the lower tidal flat of Gomso Bay, southwestern coast of Korea. Surface bedforms, sedimentary structures, sedimentation rate, grain size distribution and can-corer sediments have been measured and analysed along the sand shoal proper zone B and its offshore zone A and onshore zone C during the period of 14 months. These three zones can be differentiated based on sedimentological characteristics: A zone - fine sand (3${\varphi}$ mean), linguoid-type ripples, 70 mm/month in sedimentation rate and no bioturbation, B zone - medium sand (2.5${\varphi}$ mean), dunes (4${\sim}$5 m in wavelength), 30 mm/month in sedimentation rate and no bioturbation, and C zone - coarse silt (5${\varphi}$ mean), sinuous-type ripples, 10 mm/month in sedimentation rate and well-developed bioturbation. These characteristics indicate that the zone C represents a relatively low-energy regime environment whereas the zone A corresponds to a relatively high-energy environment. The zone B would play an important role for a barrier to dissipate the approaching wave energy, resulting in maintaining of low-energy conditions in the inner part of Gomso-Bay intertidal flat behind.

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Growth of the manila clam (Ruditapes philippinarum) cultured in Gomso tidal flat, Korea (곰소만 갯벌에서 양식되는 바지락 (Ruditapes philippinarum) 의 성장)

  • Lim, Hyun-Sig
    • The Korean Journal of Malacology
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    • v.32 no.3
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    • pp.189-195
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    • 2016
  • The growth of manila clam Ruditapes philippinarum inhabiting culturing ground was studied in west coast Gomso tidal flat of Korea, from August 2000 to July 2001. The density of the clam was the highest in November 2000, showing a monotonic decrease afterwards over the study period. Mean density was $1,224ind./m^2$ during the study period. Size frequencies of the clam showed a unimodal distribution, and its mode increased with shell growth over time. Although the growth of shell length of manila clam was monotonic, the growth rates decreased between July 2001 and February 2002 and increased from March 2002. The biomass of the clam also increased with time, in which the increments becoming larger since March 2002. The clam shell length had linear relationship to shell height, and had logarithmic relationship to total weight, meat wet weight, dry meat weight, and AFDW. Condition index of the clam increased continuously until April, decreasing afterwards in 2001. The pattern was similar in 2002. Based on fluctuations in condition index, the spawning time of manila clam in Gomso tidal flat is inferred to be between May and October. These results suggested that optimal harvests can be made before summer season when growth decreased and mass mortality occurred, after 24 months of seed shell release.

Composition of Benthic Diatom Species and Biomass in the Tidal Flat of Southwestern Coast in Korea (한국 남서해안 갯벌의 저서돌말류 종조성 및 생물량)

  • Kong, Se Hoon;Shin, Yoon Keun
    • Korean Journal of Environmental Biology
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    • v.36 no.4
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    • pp.610-619
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    • 2018
  • This study was carried out in August and September 2016 to investigate the species composition and biomass of benthic diatoms in Yubu Island, Gomso Bay, Imja Island, and Yeoja Bay tidal flat of Southwestern coast. There were 181 species of 48 genera in Yubu Island tidal flats, 194 species of 51 genera in Gomso Bay tidal flats, 224 species of 64 genera in Imja Island tidal flats and 188 species of 56 genera in Yeoja Bay tidal flats. A total of 274 species of 70 genera appeared. Pennales appeared more widely than Centrales and were dominated by Paralia sulcata and Navicula spp. Biomass of Yubu Island tidal flat ranged from $18.8-136.1mg\;m^{-2}$, $31.9-215.7mg\;m^{-2}$ in Gomso Bay, $2.9-120.2mg\;m^{-2}$ in Imja Island and $10.1-147.7mg\;m^{-2}$ in Yeoja Bay. The range of total biomass from 4 areas was $2.9-215.7mg\;m^{-2}$. The concentration of phaeopigment and degradation product of chlorophyll-a was $1.7-470.8mg\;m^{-2}$ in Yubu Island tidal flat, $52.3-277.2mg\;m^{-2}$ in Gomso Bay, $0.6-78.9mg\;m^{-2}$ in Imja Island and $39.1-346.3mg\;m^{-2}$ in Yeoja Bay. Compared with the results reported in this study area and the domestic tidal flats, it cannot be directly compared and evaluated due to various factors such as the timing of the survey, the frequency of the survey, the analysis method and geography. The southwestern coast of Korea has a variety of benthic diatoms and the high concentration of chlorophyll-a is the main determinant of primary productivity.

Characteristics of Landsat ETM+ Image for Gomso Bay Tidal Flat Sediments (곰소만 조간대 퇴적물의 Landsat ETM+ 자료 특성)

  • 류주형;최종국;나영호;원중선
    • Korean Journal of Remote Sensing
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    • v.19 no.2
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    • pp.117-133
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    • 2003
  • A field survey and Landsat ETM+ image acquisition carried out simultaneously. Using these data, we attempted to establish relationships between tidal flat environmental factors and reflectance observed by ETM+, and to set up a new critical grain size useful for optical remote sensing. Although the grain size of 4 $\Phi$ has been conventionally used as a critical size by sedimentologists, the correlation with optical reflectance was very low. Instead, the grain size of 2 $\Phi$ showed a relatively high correlation coefficient, 0.699, with ETM+ band 4, except near tidal channels in upper tidal flat. We concluded that the grain size of 2 $\Phi$ would be better to use for a critical grain size in Gomso Bay. The grain size also correlated well with moisture content having a correlation coefficient of -0.811 when the 2 $\Phi$ criterion was used. The results of factor analysis showed moisture content was more important parameter than topographic relief, and they were different from German tidal flats in which topographic relief was the prior factor This can be explained by finer grain composition of the Gomso bay tidal flat. In short, moisture content and topography as well as grain size should be considered in tidal flat remote sensing.