• Title/Summary/Keyword: Soyang

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Phosphorus Cycle in a Deep Reservoir in Asian Monsoon Are3 (Lake Soyang, Korea) and the Modeling with a 2-D Hydrodynamic Water Quality Model [CE-QUAL-W2] (아시아 몬순지역의 대형댐(소양호)에서의 인순환과 2차원모델의 적용)

  • Kim, Yoon-Hee;Kim, Bom-Chul
    • Korean Journal of Ecology and Environment
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    • v.37 no.2 s.107
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    • pp.205-212
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    • 2004

  • Phosphorus cycle was studied in a deep stratified reservoir in summer monsoon area (Lake Soyang, Korea) by surveying phosphorus input from the watershed and the movement of phosphorus within the reservoir. And the spatial and temporal distribution of phosphorus was modeled with a 2-dimensional water quality model (CE-QUAL-W2), Phosphorus loading was calculated by measuring TP in the main inflowing river (the Soyang River) accounting for 90% of watershed discharge. TP of the Soyang River showed a large daily variation with the flow rate. High phosphorus loading occurred during a few episodic storm runoff laden with suspended sediments and phosphorus. Because storm runoff water on rainy days have lower temperature, it plunges into a depth of same temperature (usually below 20m depth), forming an intermediate turbidity layer with a thickness of 20 ${\sim}$ 30 m. Because of stable thermal stratification in summer the intermediate layer water of high phosphorus content was discharged from the dam through a mid-depth outlet without diffusing into epilimnion. The movement of runoff water within the reservoir, and the subsequent distribution of phosphorus were well simulated by the water quality model showing a good accuracy. The major parameter for the calibration of phosphorus cycle was a settling velocity of detritus, which was calibrated to be 0.75 m ${\cdot}$ $day^{-1}$. It is concluded that the model can be a good simulator of limnological phenomena in reservoirs of summer monsoon area.

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Association of Sasang Constitutional Type with Bone Mineral Density, Osteopenia, and Osteoporosis (사상체질과 골밀도, 골감소증, 골다공증과의 연관성)

  • Lee, Seung Ku;Yoon, Dae Wui;Kim, Jong Yeol;Kim, Jin Kwan;Yi, Hyeryeon;Lee, Sunghee;Abbott, Robert D.;Shin, Chol
    • Journal of Sasang Constitutional Medicine
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    • v.32 no.3
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    • pp.33-45
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    • 2020

  • Object Although Taeeum and Soyang constitutional types have bigger body shapes and higher body mass index values than those with the Soeum, the relationship between the Sasang constitutional type and bone mass density is controversial and the association of osteopenia and osteoporosis remains unknown. Therefore, we investigated the relationship between bone mineral density, osteopenia, and osteoporosis according to Sasang constitutional type. Methods A total of 2,508 participants were included in this study. Among the study participants, 1,396 had Taeeum type, 276 had Soeum type, and 836 had Soyang type, respectively. The relationships to bone mass density, osteopenia, and osteoporosis in those with Sasang constitutional type were estimated using logistic and linear regression models. Results Bone mass density was significantly higher in the order of Taeeum, Soyang, and Soeum group (p < 0.01). Soeum group in comparison with Taeeum or Soyang group was significantly associated with a high odds ratio for osteopenia and osteoporosis except in the hip and femoral neck in the comparison of Taeeum and Soeum group (p < 0.01). Moreover, the bone mass density of Soeum group decreased more rapidly as the age increased when compared with Taeeum and Soyang group. Conclusions Our findings may contribute to the early prevention and management of high-risk individuals with poor bone mass density, osteopenia, and osteoporosis using Sasang constitution medicine.

  • https://doi.org/10.7730/JSCM.2020.32.3.33 인용 PDF KSCI

Study of the Mitigation of Algae in Lake Uiam according to the Operation of the Chuncheon Dam and the Soyang Dam (춘천댐 및 소양강댐 운영에 따른 의암호 조류 저감 연구)

  • Lee, Dong Yeol;Baek, Kyong Oh
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.42 no.2
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    • pp.171-179
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    • 2022

  • In this study, the characteristics of algae mitigation according to dam operation were quantitatively analyzed for Uiam Lake, where the Chuncheon Dam is located upstream of the main stream, Uiam Dam is located downstream, and Soyang Dam is located in the tributary stream. Nine dam operation scenarios were applied to the event of the summer of 2018 (at that time an algae alert occurred) using the EFDC model, which is capable of calculating three-dimensional hydrodynamics and water quality levels such as those associated with chlorophyll-a. The dam operation scenarios were set to generate a flushing effect via discharges in the form of pulse waves from the upstream dams and by lowering the water level at the downstream dam. At Uiam Lake, the flushing effect was different depending on the operation of the dam, and the amount of algae reduction at each point was different owing to topographic characteristics and the different base water temperatures from BukHan River and Soyang River. With regard to a point located on the left bank, it was predicted that the peak level of chlorophyll-a would be reduced by approximately 50 % or more upon pulsed discharge at 50 m3/s for three days at Soyang Dam. However, for the right bank, the amount of discharge from Soyang Dam had little effect on algae mitigation. Therefore, an appropriate dam operation could be effective for algae mitigation at specific points in the water body where large dams exist upstream and downstream, such as at Uiam Lake, in an emergency situation in which algal blooms rapidly.

  • https://doi.org/10.12652/Ksce.2022.42.2.0171 인용 PDF KSCI

Possibilities of Wasabia japonica Matsum Culture using Cold Water of the Soyang River Dam (소양강댐의 냉수(冷水)를 이용한 고추냉이 재배 가능성)

  • Lee, Sung-Woo;Seo, Jeong-Sik;So, Ho-Seob;Beon, Hak-Su;Park, Jang-Hwan;Kim, Suk-Dong
    • Korean Journal of Medicinal Crop Science
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    • v.4 no.4
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    • pp.294-300
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    • 1996

  • We performed an experiment to confirm the possibility of wasabi culture using the wat­er of the Soyang River Dam in Chunchon and the ground water in Suwon. Water mineral content of Soyang River except for P was less than that of ground water of Suwon. Dis­solved oxgen and E C of Chunchon was proper to culture wasabi but E C and dissolved oxgen of Suwon was not suitable for that. Water temp. of Soyang river was very changable by month while that of the ground water in Suwon was kept constantly. In Soyang river of Chunchon the month that water temp. show $8{\sim}18^{\circ}C$, optimal growth temp., was May to Nov. and the month that water temp. show less than $6^{\circ}C$, growth limit temp., was $Jan.\;{\sim}\;Feb.$ of Chunchon. Rhizome weight of main stem in Chunchon and Suwon was 63g and 22g per plant and rate of maketable rhizome was each 80%, 0% by culture of 32 months to include raising see­dling period of 13 months. Dry matter partitioning ratio of petiole in Soyang river of Chunchon was the highest of all others but it was lowest of all others in ground water of Suwon. Rhizome weight of main stem in Chunchon was showed possitive correlation with plant height and fresh top weight and in Suwon it was showed possitive correlation with root weight and high possitive correlation with No. of total leaves and No. of tillers.

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