• 농업과학연구
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• 제45권2호
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• pp.258-264
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• 2018

A study was performed to analyze the biochemical composition (moisture, protein, fat, ash, salt value, iron, calcium and phosphorus) of raw and salted hilsa. Pure (with less than 1% impurities) and clean dry salt was used (fish weight : salt weight = 3 : 1) for salting the hilsa. The nutrients values of the hilsa from two different regions were significantly (p < 0.05) varied. The biochemical compositions were also different before and after the processing of the hilsa. Riverine hilsa contains relatively more moisture ($57.79{\pm}0.51%$) and protein ($15.65{\pm}0.50%$) than marine hilsa. Fat ($16.39{\pm}0.51%$) and salt ($1.80{\pm}0.14%$) contents are higher in marine hilsa; whereas the ash ($7.88{\pm}0.35%$) content was higher in the riverine hilsa. Minerals like iron ($4.92{\pm}0.32mg/100g$) and calcium ($480.02{\pm}6.73mg/100g$) remain in large amounts in the marine hilsa, but the phosphorus ($112.36{\pm}4.40mg/100g$) content remains at a high level in the riverine hilsa. In addition, the protein (raw condition, $18.54{\pm}0.46%$, riverine; $17.12{\pm}0.42%$, marine and salted condition, $32.54{\pm}0.5%$, riverine; $27.31{\pm}0.48%$, marine) and fat (raw condition, $15.41{\pm}0.46%$, riverine; $19.07{\pm}0.51%$, marine and salted condition, $11.58{\pm}0.39%$, riverine; $13.6{\pm}0.55%$, marine) contents were higher in the abdominal region of the riverine and marine hilsa both in the raw and salted conditions than in the head and caudal region.

• 한국습지학회지
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• 제16권4호
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• pp.463-476
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• 2014

하천변에 위치한 하도습지는 치수사업을 통한 치수가치와 하도습지의 생태적 보전가치가 대립함으로써 사회적 갈등을 야기하고 있다. 본 연구에서는 하도습지의 치수가치와 생태가치에 대한 경제성 분석을 통해 두 가치 모두의 중요성을 확인하였으며, 이러한 결과를 바탕으로 치수안전과 생태보전을 고려한 하도습지 관리방안을 제시하고자 하였다. 이를 위해 다차원 홍수피해산정방법(MD-FDA)과 조건부가치측정법(CVM)을 이용하여 임진강 하구유역의 연평균 홍수피해액과 하도습지의 생태보전가치를 산정하였다. 분석결과, 임진강 하구지역은 치수사업도 필요하고, 하도습지의 생태적 보존가치 역시 중요하여 단계별 치수사업과 하도습지의 보호를 위한 관리방안 수립이 필요한 것으로 나타났다. 그 결과 임진강 하도습지는 지속적으로 퇴적이 발생하고 홍수위가 상승하는 지역으로 분류되었다. 이를 바탕으로 임진강 하구는 하천정비사업 시 치수안전과 생태보전을 함께 확인하며 진행하는 것이 필요하고, 생태계 교란을 최소화하기 위한 단계적인 하천정비시행이 바람직할 것으로 판단되었다. 본 연구에서 도출된 결과를 토대로 향후 치수사업과 하도습지의 보존을 함께 고려한 하천관리방안 수립을 위한 기초자료로 활용 될 수 있을 것으로 기대된다.

• 한국물환경학회지
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• 제24권2호
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• pp.195-200
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• 2008

To analyze the riverine microbial community structure, genetic fingerprints and ecological indexes such as species abundances, diversity, evenness, dominance of targeted rivers in Gyeonggi Province were acquired and evaluated using terminal restriction fragment length polymorphism (T-RFLP) technique. Genetic fingerprinting technique such as T-RFLP, which is able to show the microbial community clearly unlike traditional culture-dependent techniques, was thought to be useful to analyse the riverine microbial ecosystem under various factors. Riverine ecosystem evaluation using visible organisms would give biased results with time, targeted organism and researcher. But, T-RFLP, which can exclude the subjected biases such as culture condition and identification, would be an option to understand natural ecosystem by including the microorganisms that defy culture but perform important functions.

• 한국지역지리학회지
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• 제19권1호
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• pp.1-13
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• 2013

담양습지보호지역은 전남 담양군과 광주광역시 북구 일원에 지정되어 있으며, 그 면적은 $980,575m^2$이다. 본 연구의 목적은 담양하천습지를 세부 지형단위로 나누고, 각 지형단위에 대한 퇴적물을 분석하여, 하천습지를 이루는 단위 생태계를 세분화하는 것이다. 하천습지는 하도습지와 범람원, 구하도 습지로 구분할 수 있는데, 담양하천습지는 하도습지의 유형에 속한다. 하도습지의 세부 지형단위를 분류하기 위하여, 1단계로 항공영상을 획득하여 세부 지형단위를 분류하였으며, 2단계로 현지 연구를 통해 분류 내용을 수정 보완하였다. 본 연구에서 담양습지보호지역은 22개의 생태계 단위로 구분된다. 그들의 퇴적물의 물리적 화학적 특성은 공간적으로 다양하게 나타나는데, 이는 담양하천습지의 서식환경이 다양함을 보여주는 것이다. 본 연구의 결과를 바탕으로 담양하천습지보호지역을 보다 효율적으로 관리할 수 있는 전략을 세울 수 있을 것이다. 이를 위해 담양습지에 형성된 다양한 하천지형과 이들을 서식지로 하는 생물들 간의 관계에 대한 학제적 연구가 필요하다.

• 환경영향평가
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• 제20권1호
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• pp.1-11
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• 2011

This study was carried out to suggest the baseline data necessary for vegetation restoration at riverine wetland within stream corridor. We used the prevalence index for wetland assessment by applying the method of weighted averages with index values based on five hydrophyte indicator status as defined by estimated probability occurred in wetland. We selected near nature and urbanized reach of Gap and Yanghwa streams as experimental site. Although two sites have some different disturbance and characteristics of watershed, they showed that similarity of vegetation community including three dominant species - Salix koreensis, Phragmites communis, Miscanthus sacchariflorus - was very high. But in case of Yanghwa stream, various kinds of emergent plants along wetted condition were distinctly occurred, resulted from difference of hydrological regime and substrate, etc. Degree of naturalness of vegetation at the sampled areas indicated that near nature area of Gap stream and all area of Yanghwa stream were fitted as riverine wetland, while urbanized area of Gap stream has changed into upland condition. In conclusion assessment system using prevalence index would be considered an effective method for evaluating of natural states of riverine wetland, but further integrated consideration of physical, hydrological, and biological factors of stream process, and also with considering the difference between those qualitative data of vegetation community.

• 한국환경복원기술학회지
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• 제9권4호
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• pp.1-12
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• 2006

The usages of urban riverine areas for the Gapchoen and Yudungcheon in Daejoen City were evaluated by analyzing riverbed characteristics and water quality and by surveying the status of the floodplain usage including questionnaires of people visiting the rivers. Both rivers appear to be stable with insignificant bed changes as the riverbeds are dominated by gravels. Water qualities of both rivers have been improved significantly over the past decade although there are quite large seasonal fluctuations, which is common in most rivers in Korea. The results of floodplain usage analyses show that Gapcheon is dominated with static uses (>70%) such as promenades and resting facilities, while Yudungcheon by dynamic uses (>44%) such as sports facilities. Overall, both rivers require better plans for riverine area usage management considering a balance between the dynamic uses and the static uses such as natural observation places for education and habitats for birds and fish in the rivers. The questionnaire survey results indicate that overall the present status of both rivers are satisfactory and that water quality improvement is one of the key factors to enhance the value of the riverine areas. Future river restoration should be conducted by taking into account the characteristics of urban rivers in harmony with surrounding natural sceneries.

• Fisheries and Aquatic Sciences
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• 제8권3호
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• pp.167-176
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• 2005

Atmospheric deposition and riverine waters were sampled throughout a year, to estimate the loading fluxes of polycyclic aromatic hydrocarbons (PAHs) into the Masan Bay and its vicinity, Korea. Atmospheric deposition fluxes of total PAHs in the surveyed area varied from 62.2 to 464 ${\mu}g/m^2/year$. Concentration of total PAHs in water samples from six rivers ranged from 34.6 to 239 ng/L. Contribution of the carcinogenic PAHs to the total PAHs occupied $38\%$ and $50\%$ for atmospheric deposition and river waters, respectively. Atmospheric deposition fluxes and water concentrations of PAHs were slightly low or moderate to those in locations from some countries. Correspondence analysis was used to investigate the loading characteristics of PAHs according to transport routes. Atmospheric deposition samples were corresponded to higher molecular aromatics of PAHs, while riverine water samples were associated with lower molecular weight of PAHs. The results indicate that the higher-molecular-weight PAHs can be primarily transported by atmosphere deposition and the lower-molecular-weight PAHs can be mainly contaminated by riverine discharge into the Masan Bay and its vicinity. Loadings fluxes of PAHs into the Masan Bay and its vicinity were 39.2 g/day via atmosphere and 10.3 g/day via rivers, showing that atmospheric input was about 4 times higher than riverine one. Therefore, in order to minimize the contamination burden of PAHs from terrestrial sources to the Masan Bay and its vicinity, the control and management of PAHs deriving from atmosphere will be necessary.

• Wind and Structures
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• 제26권6호
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• pp.343-354
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• 2018

A realistic FEM structural model is developed to predict the behavior, load transfer, force distribution and performance of a riverine platform under earthquake and environmental loads. The interaction between the transfer plate and the piles supporting the platform is investigated. Transfer plate structures have the ability to redistribute the loads from the superstructure above to piles group below, to provide safe transits of loads to piles group and thus to the soil, without failure of soil or structural elements. The distribution of piles affects the distribution of stress on both soil and platform. A materially nonlinear earthquake response spectrum analysis was performed on this riverine platform subjected to earthquake and environmental loads. A fixed connection between the piles and the platform is better in the design of the piles and the prospect of piles collapse is low while a hinged connection makes the prospect of damage high because of the larger displacements. A fixed connection between the piles and the platform is the most demanding case in the design of the platform slab (transfer plate) because of the high stress values developed.

• 물과 미래
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• 제29권4호
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• pp.161-176
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• 1996

기존 하천유지유량 결정 방법을 문헌 조사와 항목별 조사 방법 등을 통해 검토하고, 검토 결과를 바탕으로 산정 가능한 항목과 방법에 따라 하천유지유량 결정 방법의 개발 방향을 결정하였다. 이에 따라 하천의 정상적인 기능 유지에 필요한 주요 항목별 필요유량 결정 방법, 구간 및 대표지점에 대한 하천유지유량과 하천관리유량의 결정 방법을 개발하였다. 고려한 항목은 주로 갈수량, 수질 보전, 어류 서식처의 복원 및 보전, 하천 경관, 수상 이용 등이고, 이와 같은 하천의 자연 및 인위적 기능을 유지하는데 필요한 하천 유지유량의 결정방법은 효율적인 하천관리에 필요한 방법을 제공할 수 있을 것이다.

• Journal of the korean society of oceanography
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• 제35권1호
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• pp.56-64
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• 2000

The importance of terrestrial organic matter as a food source for a brackish water clam Corbicula japonica was evaluated using stable carbon isotope ratios (${\delta}^{13}$C) in its tissues and potential food resources in an estuarine system of Youngil Bay, Korea. Suspended particulate organic matter (POM) had distinct ${\delta}^{13}$C values from riverine (-31.8 to -27.2%$_o$) to marine waters (-21.0 to -16.6%$_o$). Estuarine macroalgae had a wide ${\delta}^{13}$C range of -22.8 to -15.0%$_o$. The ${\delta}^{13}$C values of riverine POM were more negative than that of riverine phytoplankton (-26.5 to -24.2%$_o$) but similar to that of freshmarsh plant species (-29.1 to -27.5%$_o$ for Phragmites communis and -28.5 to -27.0%$_o$ for Salix gracilistyla), These ${\delta}^{13}$C values suggest that the POM transported by the Hyungsan River is predominantly of terrestrial origin rather than riverine autochthonous sources. The ${\delta}^{13}$C values of Corbicula japonica tissues (-28.7 to -27.2%$_o$) were most similar to values for riverine POM and freshmarsh plants. There was no significant difference in the isotopic composition of the clam individuals. The results indicate a predominant contribution of organic carbon derived from terrestrial and fresmarsh plant detritus to the diet of Corbicula japonica. Our results also confirm previous suggestion that terrestrial organic matter can be incorporated into estuarine food webs although its role is confined to the upper estuarine reaches.