• Journal of Korean Port Research
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• v.9 no.1
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• pp.45-56
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• 1995

Investigation of the physical behavior of dredged material disposal in coastal water includes estimations of water column concentration in the receiving water, exposure time, the initial deposition pattern as well as thickness of material at the dumping fields near the estuary area. Calculation based on vertical setting and horizontal advection of single particles ignore the effects of bulk properties of the disposed material, vertical and horizontal diffusion, and material dilution due to the entrainment of ambient water during descent. This paper focuses on the spatial and temporal changes in the dumping fields for the water column and bottom at a hypothetically confined coastal water, where the ambient time-invariant velocity and density profiles are applied, within the initial time period following the instantaneous release of the dredged material. This model accounts the behavior of material after release divided into three phases: convective descent, dynamic collapse and long-term passive dispersion

• YAKHAK HOEJI
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• v.20 no.1
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• pp.97-106
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• 1976

The actions of Atractylodes rhizoma alba on renal function of dog were investigated with water and methanol extract of it, utilizing clearance technique. Water extract elicited diuresis while methanol extract induced antidiuresis in the dog when they were given intravenously. The diuresis induced by the intravenous water extract seemed to be closely related to the decrement of reabsorption of electrolytes in renal tubules. On the contrary, the antidiuresis by intravenous methanol extract appeared to be related to the increment of renal reabsorption of sodium. Water and methanol extract, when infused into a renal artery, exhibited identical resposes to the intravenous actions confined only to the infused kidney, inferring that renal actions of water and methanol extract are not mediated by any endognous humoral extract are not mediated by any endogenous humoral agents. From these observations it is concluded that diuretic action of water extract and antidiuretic action of methanol extract were brought about by direct action in the renal tubules.

• Journal of Soil and Groundwater Environment
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• v.17 no.4
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• pp.51-62
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• 2012

Effects of climate change on groundwater system requires understanding the groundwater system in temporal and spatial scales through the long-term monitoring. In this study, the spatio-temporal variations of groundwater were analyzed through the continuous observation of water level, electrical conductivity (EC) and water temperature with automatic data-loggers and sampling in a Gwangneung catchment, Korea, for the four years from 2008 to 2011. Groundwater monitoring were performed at the nest-type wells, MW1 and MW2, located in upsteam and downstream of the catchment, respectively. During the survey period, both the total amount of annual precipitation and the frequency of concentrated rainfall have increased resulting in the elevation of runoff. Water level of MW1 showed no significant fluctuations even during the rainy season, indicating the confined groundwater system. In contrast, that of MW2 showed clear seasonal changes, indicating the unconfined system. The lag-time of temperature at both wells ranged from one to three months depending on the screened depths. Results of chemical analyses indicated that major water compositions were maintained constantly, except for the EC decreases due to the dilution effect. Values of the stable-isotope ratios for oxygen and deuterium were higher at MW2 than MW1, implying the confined system at the upstream area could be locally developed.

• Journal of the Speleological Society of Korea
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• no.63
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• pp.45-59
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• 2004

Chilbo Mountain Area have the high water table. Chilbo wetland located near the sully or distributes, but had a little water source by surface water. The most of Chilbo wetland water sources are aquifer or confined aquifer. This hydro-geomorphologic charateristics made them into many rice fields. But today these rice fields changed the watland for this points.

• Proceedings of the Korea Society of Environmental Biology Conference
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• 2004.05a
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• pp.25-25
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• 2004

We studied algal growth-related water quality of the Dongbok lake which is the drinking water reservoir for the Gwangju municipality. Peridinium cinctum and several diatomic algal species frequently caused water bloom throughout the lake from early spring to late autumn. With the heaviest predominance of Peridinium cintum in May 2003, COD was 13.7 mg/I in the surface layer. Highly turbid surface water with 46.8 mg/I of SS was also caused by Perdinium bloom. Peridinium bloom decisively eliminated cyanobacterial growth in the lake, otherwise cyanobacterial bloom resulted. Dense algal layer was confined in the upper several meters of the water column above the thermocline, which gives relatively algae-free water in deeper layer suitable for drinking source water supply. Upon collapse of thermocline, water quality of the surface layer was improved while deeper layer was deteriorated in terms of water quality. This paper deals with some details of water quality changes with algal growth in the Dongbok lake past two years.

• Proceedings of the Korea Society of Environmental Biology Conference
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• 2004.05a
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• pp.27-27
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• 2004

We studied algal growth-related water quality of the Sangsa lake which is the drinking water reservoir for the south-eastern region of Jeonnam province. Peridinium cinctum and several diatomic algal species frequently caused water bloom throughout the lake from early spring to late autumn. With the heaviest predominance of Peridinium cintum in May 2003, COD was 22.7 mg/l in the surface layer. Highly turbid surface water of 15 NTU was also caused by Perdinium bloom. Cyanobacterial growth was effectively prohibited by dominant growth of Peridinium in the Sangsa lake, otherwise confronted with cyanobacterial bloom. Dense algal layer was confined in the upper several meters of the water column above the thermocline, which gives relatively algae-free water in deeper layer suitable for drinking source water supply. Upon collapse of thermocline, water quality of the surface layer was improved while deeper layer was deteriorated. This paper deals with some details of water quality changes with algal growth in the Sangsa lake past two years.

• 한국해양학회지
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• v.23 no.1
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• pp.13-23
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• 1988

A simple model is presented which may explain the distributions of cold surface water near Ulsan. The model considers the problem as an advection-diffusion process with cold source confined within narrow coastal areas. The natural warming due to vertical process (interaction either with the atmosphere above or with the subsurface water below) also plays an important role. A simple numerical computation reproduces the observations quite well. The localization of cold surface water occurs at the point where the local warm current separates from the coast.

• 한국지구물리탐사학회:학술대회논문집
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• 2007.06a
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• pp.87-92
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• 2007

This work describes the installation and preliminary measurements of an electrical resistivity tomography (ERT) system to monitor the injection of recycled water into a confined aquifer in the area of Sindos (Thessaloniki N. Greece). The aim is to provide, through time-lapse ERT measurements and processing, geoelectrical images of rather increased volumetric sampling around and between the holes and to obtain improved understanding of the flow and transport of the injected water. The details about the general setting, the construction and installation of the ERT cables into the boreholes are explained in full. Preliminary measurements involving single and cross-hole ERT measurements were obtained and processed with a 2D inversion algorithm to produce images of the subsurface. Results depict a very good correlation between ERT images and the lithology and resistivity logs; an indication of the reliability of the approach.

• YAKHAK HOEJI
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• v.22 no.4
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• pp.207-214
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• 1978

Influence of Akebiae Lignum on the renal function of the dog was observed with water-extract, utilizing clearance technique. Akebiae Lignum water-extract (AWE) given intravenously in does of 3.0mg/kg and 30.0mg/kg elicited a marked antidiuretic effect and produced a distinguished decrease of glomerular filtration rate and renal plasma flow as reduction of sodium and potassium excretion in urine, positive free water clearance and osmolar clearance. AWE infused into a renal artery in doses of 0.03mg/kg/min and 0.1mg/kg/min exhibited identical results to the intravenous action confined only to the infused kidney. These results suggest that AWE elicits antidiuresis in the dog by decreasing glomerulor filtration and renal plasma flow, which are caused by the constriction of vas afferens in the glomeruli.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.50 no.2
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• pp.207-218
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• 2017

Seawater with salinity of 32.5 psu or less is observed in the southern Japan/East Sea (JES) every autumn. It is confined to a surface layer 30-45 m in depth that expands to cover the entire JES in October. Two sources of "autumn low-salinity water" have been identified from historical hydrographic data in the western JES: East China Sea (ECS) water mixed with fresh water discharge from the Yangtze River (Changjiang) and seawater diluted with melted sea ice in the northern JES. Low-salinity water inflow from the ECS begins in June and reaches its peak in September. Low-salinity water from the northern JES expands southward along the coast, and its horizontal distribution varies among years. A rare observational study of the entire JES in October 1969 indicated that water with salinity less than 33.0 psu covered the southwestern JES; the lowest salinity water was found near the Ulleung Basin. In October 1995, the vertical distribution of salinity observed in a meridional section revealed that water with salinity of 33.6 psu or less was present in the area north of the subpolar front.