Interpolation and Reconstruction of the Holocene Sea-levels Using Inverse Fractal Interpolation functions

정상용,김대철,이희일,CHUNG, SANG YONG,KIM, DAE CHOUL,YI, HI-IL The Korean Society of Oceanography 1994 韓國海洋學會誌 Vol.29 No.3

The change of sea-level is a good indicator of the change of climate during the Quaternary period. The sea-levels in the world have been changing very irregularly during that time. The pattern of the Quaternary sea-level change was assumed to be a stochastic fractal in this study. We measured fractal dimensions of the Holocene sea-levels of the Hudson river estuary and the Delaware coast. A box counting method gave almost the same values. i.e., D=1.358 for the Hudson sea-level changes and D+1.346 for the Delaware sea-level changes. the ability of the inverse method of fractal interposea-levels. IFIF reproduction the realistic sea-levels for the both of them. The delaware sea-level data made less statistical errors for the interpolation of IFIF than the Hudson and the Delaware sea-levels. IFIF reproduction the realistic sea-levels for the both of them. The Delaware sea-level data made less statistical errors for the interpolation of IFIF than the Hudson sea-level data. This suggests that the Delaware sea-level data are more reliable than the Hudson sea-level data was calculated from the fractal dimension of the Delaware sea-level data. Fractal interpolation functions (FIF) was used to reconstruct the peleosea-levels of the Korean coasts and the Atlantic Ocean coasts of the United States. The Korean Peleosea-level change generacted by FIF is different from the peleosea-level change of the eastern U.S.. The Korean peleosea-levels are much higher than the eastern U.S. Paleosea-levels, comparing to each other from the present to 8,000 BP.

부산 수영구 지하철 터널에서의 지하수 유출이 주변 지하수에 미치는 영향

정상용,김태형,박남식,Chung, Sang-Yong,Kim, Tae-Hyung,Park, Nam-Sik 한국지하수토양환경학회 2012 지하수토양환경 Vol.17 No.2

This study carried out several kinds of investigations such as geology, hydrogeology, groundwater level and quality, surface-water quality, and the quantity and quality of groundwater discharge from the subway to identify the causes of groundwater contamination around the subway tunnel at Suyeong District in Busan City. Geostatistical analyses were also conducted to understand the characteristics of groundwater level and quality distributions. There are Kwanganri Beach and Suyeong River in the study area, which are basically influenced by seawater. The total quantities of groundwater utilization and groundwater discharge from the subway tunnel in Suyeong District are 2,282,000 $m^3$/year, which is 2.4 times larger than the sustainable development yield of groundwater. The lowest groundwater level around the subway tunnel is about 32 m below the mean sea-level. The large drawdown of groundwater led to the inflow of seawater and salinized river water toward the subway tunnel, and therefore the quality of groundwater didn't satisfy the criteria of potable, domestic, agricultural and industrial uses. Distribution maps of groundwater level and qualities produced by kriging were very useful for determining the causes of groundwater contamination in the study area. The distribution maps of electrical conductivity, chloride and sulfate showed the extent of seawater intrusion and the forceful infiltration of the salinized Suyeong River. This study revealed that seawater and salinized river water infiltrated into the inland groundwater and contaminated the groundwater around the subway tunnel, because the groundwater level was seriously drawdowned by groundwater discharge from the subway tunnel. The countermeasure for the minimization of groundwater discharge from the subway tunnel is necessary to prevent the groundwater obstacles such as groundwater depletion, groundwater-quality deterioration, and land subsidence.

복합토양층의 불포화대와 포화대에서 연속주입 추적자시험을 이용한 수리분산특성 연구

정상용,강동환,이민희,손주형,Chung, Sang-Yong,Kang, Dong-Hwan,Lee, Min-Hee,Son, Joo-Hyong 한국지하수토양환경학회 2006 지하수토양환경 Vol.11 No.4

Using a continuous injection tracer test at a multi-soil layer deposit, the difference of hydrodynamic dispersions in unsaturated and saturated zones were analyzed through breakthrough curves of Rhodamine WT, linear regression of concentration versus time, concentration variation rates versus time, and concentration ratio according to the distance from injection well. As a result of continuous injection tracer test, the difference of the maximum concentrations of Rhodamine WT in unsaturated and saturated zones were 13-15 times after 160 hours, and the increased rate of concentration versus time in unsaturated zone was about 10 times higher than in saturated zone. The fluctuation of Rhodamine WT breakthrough curve and concentration variation rate with time in saturated zone were larger than in unsaturated zone. Rhodamine WT concentration ratio with the distance from the injection well in saturation zone was linearly decreased faster than in unsaturated zone, and the elapsed time necessary for the concentration ratio less than 2 was longer in saturation zone. The differences resulted from the lower concentration and slower hydrodynamic dispersion of Rhodamine WT at the saturation zone of the multi-soil layer deposit, in which groundwater flow significantly flow and aquifer materials have high hydraulic heterogeneity. Effective porosity, longitudinal and transverse dispersivities were estimated $10.19{\sim}10.50%,\;0.80{\sim}1.98m$ and $0.02{\sim}0.04m$, respectively. The field longitudinal dispersivity is over 12 times larger than the laboratory longitudinal dispersivity by the scale-dependent effect.

개선된 DRASTIC 기법과 퍼지기법을 이용한 밀양지역 지하수오염 취약성 평가

정상용,후삼 엘딘 엘자인,벤카트라마난 세나파티,박계헌,권해우,유인걸,오해림,Chung, Sang Yong,Elzain, Hussam Eldin,Senapathi, Venkatramanan,Park, Kye-Hun,Kwon, Hae-Woo,Yoo, In Kol,Oh, Hae Rim 한국지하수토양환경학회 2018 지하수토양환경 Vol.23 No.4

The purpose of this study is to improve the Original DRASTIC Model (ODM) for the assessment of groundwater contamination vulnerability on the GIS platform. Miryang City of urban and rural features was selected for the study area to accomplish the research purpose. Advanced DRASTIC Model (ADM) was developed adding two more DRASTIC factors of lineament density and landuse to ODM. The fuzzy logic was also applied to ODM and ADM to improve their ability in evaluating the groundwater contamination vulnerability. Although the vulnerability map of ADM was a little simpler than that of ODM, it increased the area of the low vulnerability sector. The groundwater vulnerability maps of ODM and ADM using DRASTIC Indices represented the more detailed descriptions than those from the overlap of thematic maps, and their qualities were improved by the application of fuzzy technique. The vulnerability maps of ODM, ADM and FDM was evaluated by NO3-N concentrations in the study area. It was proved that ADM including lineament density and landuse factors produced a more reliable groundwater vulnerability map, and fuzzy ADM (FDM) made the best detailed groundwater vulnerability map with the significant statistical results.

먹는 샘물 환경영향 조사 중 수리지질조사 분야

정상용(Sang Yong Chung) 자연사 미래환경학회 1996 SYMPOSIUM Vol.1996 No.-

N/A

불균질,이방성 대수층의 지하수 유동분석에 지구통계기법의 응용

정상용 ( Sang Yong Chung ),유인걸 ( In Kol Yoo ),윤명재 ( Myung Jae Yoon ),권해우 ( Hae Woo Kweon ),허선희 ( Seon Hee Heo ) 대한지질공학회 1999 지질공학 Vol.9 No.2

단계양수시험 해석시 우물상수 산정 방법이 우물효율에 미치는 영향

정상용 ( Sang Yong Chung ),김병우 ( Byung Woo Kim ),김규범 ( Gyoo Bum Kim ),권해우 ( Hae Woo Kweon ) 대한지질공학회 2009 지질공학 Vol.19 No.1

Step-drawdown tests were conducted at four pumping Wells, two in porous media and two in fractured rocks, respectively. In general, P = 2.0 suggested by Jacob (1947) is applied to porous media and fractured rocks in terms of drawdowns of step-drawdown test. In an attempt to review problems of linear model (Jacob`s graphic method) in interpreting the step-draw down test, the outcomes of well parameters (aquifer loss coefficient (B), well loss coefficient (C) and well loss exponent (P)) calculated from linear and nonlinear model (Labadie and Helweg`s leastsquares method) were compared and analyzed. The values of C and P calculated from linear and nonlinear models differed according to permeability of aquifer and the conditions of pumping well. The value C obtained from nonlinear models in porous media and fractured rocks is about 100~10-2 and 10-3~10-6 times lower than in their linear models, respectively. The value P of porous media obtained from nonlinear model ranged from 2.123 to 2.775, while it ranged from 3.459 to 5.635 for fractured rocks. In case of nonlinear model, well loss highly depends on the value P. At this time, well efficiencies calculated from linear and nonlinear models were 1.56~14.89% for porous media and 8.73~24.71% for fractured rocks, showing a significant error according to chosen models. In nonlinear model, it was found that the regression analysis using the least squares method was very useful to interpret stepdrawdown test in all aquifer.

지하수위 분포 모델링을 위한 UNIVERSAL KRIGING의 응용 -1. K 계(階)의 고유 확율함수

정상용 ( Sang Yong Chung ) 대한지질공학회 1993 지질공학 Vol.3 No.1

터널 굴착에 의한 화강암 대수층의 수리 수문 및 지하수위변동 분석

정상용 ( Sang Yong Chung ),김병우 ( Byung Woo Kim ),강동환 ( Dong Hwan Kang ),심병완 ( Byoung Ohan Shim ),정상원 ( Sang Won Cheong ) 대한지질공학회 2007 지질공학 Vol.17 No.4

Average hydraulic conductivity was 2.64× 10(-8) m/sec, average RQD was 78%, average porosity was 0.51%, and range of groundwater level was 77.06~125.97 m by measured in 8 boreholes at the Surak Mt. tunnel area. Groundwater level of two peaks in the Surak Mt. tunnel area were estimated through linear regression analysis for groundwater level versus elevation. And, average horizontal hydraulic gradient in the Surak Mt. tunnel area was calculated 0.267. Minimum, maximum, and average hydraulic conductivities that estimated by field tests were 5.56× 10(-9) m/ sec, 6.12× 10(-8) m/sec, and 2.64× 10(-8) m/sec, respectively. Groundwater discharge rates per 1 meter that estimated using minimum, maximum, and average hydraulic conductivities and average horizontal hydraulic gradient were 0.00585 m2/day, 0.06434 m2/day, and 0.02775 m2/day, respectively. Pure groundwater recharge rate per unit recharge area was calculated 223.96 mm/yr through water balance analysis. Prediction simulation of groundwater level fluctuation with minimum, maximum, and average hydraulic conductivities were conducted. Discharge rate into the Surak Mt. tunnel for minimum hydraulic conductivity was small, but groundwaer drawdown was highly. Discharge rate into the Surak Mt. tunnel for maximum hydraulic conductivity was higher, but groundwaer level was recovered quickly.

지구과학 ; 부산 석대 폐기물 매립지 일원의 수질 환경

정상용(Sang Yong Chung),권해우(Hae Woo Kweon),이강근(Kang Kun Lee),김윤영(Yoon Young Kim) 부경대학교 기초과학연구소 1998 부경대 기초과학연구논문집 Vol.1 No.-