• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2000년도 추계학술대회
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• pp.232-236
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• 2000

Multi-regression statistical analyses were applied for the water quality data of shallow alluvial ground water (n = 47) collected from the Youngdeok area, in order to quantitatively generalize the natural (non-anthropogenic) causes of regional water quality variation. Seven samples having the high contamination index ( $C_{a}$ > 3) reflect the striong effects by anthropogenic activity. Most of the alluvial groundwaters have acquired their quality primarily due to the dissolution of carbonate minerals. The results of multi-regression analysis show that chlorine is mainly derived from seawater effect. Sulfur isotopic compositions of dissolved sulfur and the S $O_4$/Cl ratio also enable us to discriminate the samples (n = 18) which are affected by atmospheric input of marine aerosol (sea-spray) and also by mixing between freshwater and seawater. Hydrogen and oxygen isotope data of the samples collected lie close to the local meteoric water line obtained from nearby Pohang city but has lower slope (5.45) on the $\delta$D-$^{18}$ O plot, indicating that alluvial groundwater was recharged from infiltrated meteoric water which has undergone some degree of kinetic evaporation. The estimated initial isotopic composition of the recharged water ($\delta$D = -74.8$^{0}$ /$_{00}$, $\delta$$^{18}$ O = -10.8$^{[-1000]}$ /$_{[-1000]}$ ) suggests that the alluvial ground water recharge largely occurs during summer storm events.s.s.

• 생태와환경
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• 제48권3호
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• pp.188-194
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• 2015

River channel dredging and riparian development have been influenced morphology and quantity of natural river habitat. We compared distribution of riverside land and alluvial island in the Nakdong River with field survey and remote sensing analysis after the 4 Large River Project in South Korea. We digitized geomorphological elements, includes main channel, riverside land, and alluvial island by using georeferenced aerial photos taken in pre-dredging (2008) and post-dredging (2012) periods. Field survey was followed in 2012 for a ground truth of digitized boundaries and identification of newly constructed wetland types such as pond, channel, branch, and riverine type. We found that during the dredging period, riverside land and alluvial island were lost by 20.2% and 72.7%, respectively. Modification rate of riverside land was higher in the section of river kilometer 50~90, 140~180, and 210~270. Alluvial island had higher change rate in the section of river kilometer 50~70, 190~210, and 270~310. Average change rate for the riverside land and alluvial island was $-1.02{\pm}0.14km^2{\cdot}10km^{-1}$ and $-0.05{\pm}0.05km^2{\cdot}10km^{-1}$, respectively. Channel shaped wetlands (72.5%) constituted large portion of newly constructed wetlands.

• 한국농촌건축학회논문집
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• 제24권4호
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• pp.85-95
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• 2022

This study is about the story of 'Saemi', existing in the Sacheon Alluvial fan area. Saemi is a local word for Dumbeong, which is the traditional water irrigation facilities in this area that could be formed according to the geographical characteristics of a Alluvial fan site. In the meantime, although Saemi has been an important source of water, related research has been mainly done from an ecological point of view. Accordingly, the researcher paid attention to the functional aspects of Saemi itself, grasped its location, distribution status, and usage including the construction method, and considered its intrinsic value through classification and characteristic analysis of Saemi. As a result of five field surveys from September 2021 to October 2022, 129 Saemies remained in the Sacheon alluvial fan area. According to the structure and shape, Saemi could be divided into basic type, complex type, and buried type. The basic type was subdivided into bucket-type and stairs-type along with the complex type, and the buried type was subdivided into all buried-type and some buried-type. Saemies were mainly distributed at the distal end of the Sacheon alluvial fan site, individual Saemies were built on farmland, and common Saemies were usually built along roadsides adjacent to villages. The reason why the Saemies are concentrated at the distal end is the geographical characteristics of the alluvial fan where the water underflows. Saemi was an important multifunctional water supply source equivalent to the main water source for people at the distal end of the pond who did not receive a stable supply of water from the reservoir. Saemi was at the center of the underground water irrigation network agricultural system in the Sacheon alluvial fan area according to the principles of 'bbaeim(drop out)' and 'gaepim(pooling)' It has provided a foundation for establishing itself as an appropriate technology in this area. Such Saemi contributed to the rural landscape and agricultural biodiversity through its own system and served as a public interest function. It is necessary to know, conserve, manage, and continuously utilize the value of this Saemi as an agricultural heritage.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2003년도 봄 학술발표회 논문집
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• pp.85-92
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• 2003

Generally, ordinary portland cement(OPC) is widely used for grouting to reduce permeability of ground under the foundations of structures. But, it is hard to be injected into the microscopic voids, fissures and crevices in soil or rock formation for the OPC material. Therefore new method what is called MSG(Micro Silica Grouting) has been developed recently to improve the weak point of the OPC material. In this case study, in order to verify performance of the MSG's water cut-off, trial injections were performed in rear of CIP(Cast in Place Pile) on the site A(weathered soil) and B(alluvial soil) that are constructed for the subway No. 9 nowadays. To take the proper grouting method of the MSG in the trial injecting, the injections are carried out for grouting types(constant pressure or fixed Quantity) and grouting methods(1.5shot or 2.0shot) and to confirm the effects of water cut-off and the injection range of the MSG, the tests of permeability and indicator(phenolphthalein) response were performed before and after the injection. Through the tests results, we could affirm the effects of water cut-off of the MSG and the injection range for the weathered and alluvial soil layers near the Han River. Finally we could make sure the application of the MSG method in actual construction under the layers.

• 한국지열·수열에너지학회논문집
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• 제14권3호
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• pp.1-7
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• 2018

In this paper, we designed a seasonal geothermal storage system and studied the applicability in the alluvial aquifer. We conducted a basic survey to apply this system to greenhouses actually operated in the Geum river basin alluvial aquifer. After choosing a potential area through electrical resistivity survey, the system parameters were set using drilling survey and pumping test result. We installed a system based on the factors, and operated for about 9 months. As a result, high temperature water(injection temperature $30^{\circ}C$) was stored at 22.5 Mcal ($1,609m^3$) for 3 months in cooling operation and 125 Mcal ($16,960m^3$) of low temperature water (injection temperature $7^{\circ}C$) were stored for 6 months in the remaining heating operation.

• 지구물리와물리탐사
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• 제10권3호
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• pp.211-218
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• 2007

본 연구는 2003년부터 2004년에 걸쳐 대한광업진흥공사에서 수행한 지하수기초조사의 사업지역인 경남 밀양 및 경기 포천의 지역별 충적층 두께 분포 특성을 파악하기 위하여 전기비저항 수직탐사(슐럼버져 배열)에 의해 획득된 충적층 심도 자료에 대하여 지구통계학적 기법인 정규크리깅을 적용하였다. 물리탐사 자료의 적용성 검증을 위하여 물리탐사 자료와 시추공 자료의 상관성분석을 실시하였다. 정규크리깅에 의해 충적층 분포를 이미지화한 결과, 지형이나 유역에 따라 충적층 심도분포가 합리적으로 묘사된 것으로 나타났으며, 따라서, 충적층 심도 분포 파악에 있어서 전기비저항 수직 탐사 자료에 의해서도 만족할만한 수준의 결과를 얻는 것이 가능한 것으로 판단된다.

• 지구물리와물리탐사
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• 제6권1호
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• pp.7-12
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• 2003

위성영상에 나타나는 선구조는 화소의 명암차에 바탕을 두어 육안판독이나 자동 추출 알고리즘을 이용하여 추출한다. 보통 육안판독은 다양한 보조자료와 연구자의 경험적 지식을 필요로 하기 때문에 더욱 객관적이고 신속한 자동선구조 추출 알고리즘들이 필요하다. 산악지형 외에도 충적층 요소까지 고려하여 개발된 DSTA(dynamic segment tracing algorithm) 알고리즘은 충적층 지역이 산악지형에 대해 비교적 넓은 부분을 차지하고 있는 경우에 충적층 지역에서 노이즈가 나타난다. 본 연구에서는 이러한 노이즈를 감소시킬 수 있는 알고리즘인 AERA(alluvial effect reducing algorithm)를 개발하여 산악지형과 농경지와 도심지역이 넓게 분포되어 있는 지역에 이를 적용하였으며, 기존의 알고리즘만 이용하여 선구조를 추출한 결과와 비교하여 이의 적용 가능성을 알아보았다.

• 한국지역지리학회지
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• 제22권1호
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• pp.225-239
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• 2016

적중 초계분지는 분지 내에서 발원하는 소하천을 합류한 산내천이 북류하여 분지를 빠져나가는 출구를 제외하면 분수계로 둘러싸여 완전한 분지 형태를 취한다. 퇴적암이 혼펠스화된 남서, 남, 남동쪽 분수계의 산지는 높고 북쪽은 구릉지이다. 이들 사이의 분지저에는 선상지와 범람원이 형성되었다. 분수계 해발고도와 유역분지 규모에 비례하여 큰 하천들이 발원하는 남쪽 분수계 전면의 선상지는 규모가 크지만, 서쪽과 동쪽으로 갈수록 작아진다. 분지의 북쪽에 분포하는 범람원은 대부분 황강의 홍수퇴적물로 덮여있다. 적중 초계분지는 기반암의 차별침식이나 운석충돌보다 지반운동에 의한 지질구조선이나 단층선을 따라 기반암이 풍화되면서 분지가 형성되었을 가능성이 높다.

• 한국지형학회지
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• 제15권2호
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• pp.1-9
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• 2008

본 연구지역은 악지를 이루고 있는 산지와 그 계곡에 발달한 충적평야, 하천을 중심으로 발달하는 하성단구, 하성단구와 산지 사이의 충적선상지로 구성되었다. 화산 폭발에 의한 화산회층이 쌓여서 형성된 치리카와는 응회암이 침식작용을 받아 기암괴석을 노출시켰다. 윌콕스 플라야는 현재보다 기후가 습윤했던 플라이스토세에 $32km^2$ 정도의 호수가 존재했던 곳으로 칼슘과 나트륨, 칼륨 같은 염이 집적된 알카리각이 드러나기도 한다. 윌콕스 주변의 과거 호안은 사구가 발달하였다. 이곳의 계곡은 주변의 산지에서 공급된 실트와 점토, 모래, 역으로 이루어진 약 700m 두께의 퇴적층으로서 플라이오세와 플라이스토세 화석이 다양하게 발견된다. 드래군 산맥 기슭에는 페디멘트가 충적지와 파상으로 만난다. 주변에 산재하는 거대한 원력은 박리작용에 의한 파쇄작용과 박판작용의 결과이다. 투산은 두께 약 7,000ft. 정도의 충적평야이다. 본 연구지역은 화산, 단층, 침식, 퇴적 등의 작용에 의하여 형성된 지형이다.

• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2004년도 총회 및 춘계학술발표회
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• pp.487-491
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• 2004

For tile hydrogeological data of the National Groundwater Monitoring Wells(NGMW), a statistical analysis is made to reveal aquifer characteristics of the country. Results of the pumping and recovery test are classified into 4～5 types by the pattern of drawdown and residual drawdown curves. The analysis of aquifer characteristics shows that the hydraulic conductivity of alluvial aquifers is greater than that of fractured-rock aquifers. The hydraulic conductivity of alluvial aquifers slightly increases as the distance to the discharge area decreases. 77.5% of the NGMWs, where the distance to the discharge area is more than 100m, shows the constant head boundary. This result suggests that the fractured and the alluvial aquifers are fairly interconnected, and water can be supplied from one aquifer to tile other where pumping tests are performed. It is analyzed that the wells showing the impermeable boundary are influenced by small scale of aquifers, poor aquifer transmissivities, and impermeable layers.