제주도 동부지역 지하수의 염수화에 관한 연구

김지영,오윤근,류성필 한국환경과학회 2001 한국환경과학회지 Vol.10 No.1

According to the results of the groundwater quality investigation about 230 holes all over the country, the groundwater which was in excess of standard grows larger every year and closed holes increased to 23,457 holes in 1997 from 15,724 holes in 1996. This is the major reasons that water quality contamination, shortage of water quantity, increasing of salinity and so on. There are 7 groundwater salinization sources which are considered as most important on a regional level. And among theses the Cheju Island groundwater salinization sources are (1) halite solution, (2) natural saline groundwater, (3) sea-water intrusion. The method of taking an isotopes is one of research methods of the origin of groundwater salinization and is used in so many studies because it has very high confidence. ^18O, ^2H, ^3H, ^14C and so on in an isotopes are frequently used in the method of them. Consequently on this study we analyzed major ions and ^3H in groundwater, sea-water and rain of the eastern part of cheju island known as contaminated site from long time ago to examine the origin of groundwater salinization. Relation ratios of the major ions versus chloride ion shows similar tendency to sea-water. This indicates that sea-water entered the groundwater layer. And amount of 3H in holes of the land side is higher than that of the sea side. Relation of chloride ion versus ^3H indicates negative character. Therefore we can think that the reason of groundwater salinization of this part is natural saline groundwater and halite solution by relation.

Prediction of the Salinization in Reclaimed Land by Soil and Groundwater Characteristics

( Jihun Jeon ),( Donggeun Kim ),( Taejin Kim ),( Keesung Kim ),( Hosup Jung ),( Younghwan Son ) 한국농공학회 2021 한국농공학회논문집 Vol.63 No.6

It is becoming more important to utilize reclaimed lands in South Korea, due to the increasing competition for its usage among different sectors. However, the high groundwater level and poor permeability are exposing them to deterioration by salinization. Salinization is difficult to predict because the pattern changes according to various characteristics of soil and groundwater. In this study, the capillary rising time was studied by the water content profile in the soil. The prediction equation of soil salinity was developed based on simulation result of the CHEMFLO model. to enable prediction considering various soil water content and groundwater level. The two terms constituting the equation showed the coefficients of determination of 0.9816 and 0.9824, respectively. Using the prediction equation of the study, the surface salinity can be easily predicted from the initial surface salinity and the salinity of the groundwater. In the future, more precise predictions will be possible with the results of studies on the hydraulic characteristics of various reclaimed soils, changes in water content profile by seasonal and climate events.

Changes in Soil Salinity and Upland Crop Productivity in Reclaimed Land as Affected by Groundwater Table

Su Hwan Lee,Yang Yeol Oh,Jin Hee Ryu,Hak Sung Lee,Bang Hoon Kang,Hee Kyeong Ock,Kang Ho Jung 한국토양비료학회 2020 한국토양비료학회지 Vol.53 No.4

Soil salinization driven by groundwater distribution in the reclaimed land is one of the major limiting factors for crop cultivation and soil management. In this study, the effects of two different water table depth (G1 site with intermediate and deep vs. G2 site with shallow depth) of groundwater (on soil salinity, water and crop productivity were investigated. The rainfall event greatly impacted the groundwater recharging rate and salt leaching. The falling groundwatr table depth from 30 to 80 cm together with higher evaporation at G2 site caused soil salinization in the rhizosphere, whereas increases in soil salinity at G1 site was negligible. Overall, soil water content at G2 site was higher than that at G1 site. The positive correlation of soil salinity with soil water content (r² = 0.69) and negative with groundwater table (r² = 0.89) indicated hydraulic connection between groundwater table and soil surface. The deeply falling groudwater table with negative water balance (Evaporation > Rainfall) induced drought-combined salt stress to crop. Soybean was much more susceptible to soil salinty stress and excess-moisture injury than maize, suggesting that the crop selection and practices to reduce crop vulnerability to abiotic stresses(salt and water) should be considered for sustainable and stable agriculture in reclaimed land. Our results highlight that groundwater table depth would play a crucial role in founding cropland suitability and the optimum groundwater table to avoid salinization and excessve wetting might be 1.5 - 2.0 m.

벼 유묘내염성 검정체계 확립에 의한 내염성 계통 선발

고종철,최원영,백남현,강현중,정진일,하기용,김정곤,이규성 한국육종학회 2009 한국육종학회지 Vol.41 No.1

벼 내염성 유묘검정에서 실용성, 경제성, 정밀성이 우수한 검정체계를 확립하고벼 자포니카 내염성 중간모본 및 품종개발을 위한 내염성 유전자원 및 품종을 선발 이용하고자 본 시험을 수행하였다. 1. 증류수 이용 Yoshida 양액에 NaCl를 첨가한 염처리는 0.3%, 0.5%, 0.7%로 희석한 바닷물로 Yoshida 양액을 제조한 염처리 보다 유묘 내염성 계통을 선발하는데 효율적이었다. 2. 수돗물로 양액 제조 처리는 증류수로 양액 제조 처리와 유묘 내 This study was conducted in order to breed Japonica salt tolerant rice and select salinity tolerant lines by establishing reliable and practical method of screening voluminous materials. Salinized nutrient solution by adding NaCl was effective compared with the salinized nutrient solution by adding 0.3%, 0.6% and 0.7% of diluted sea water. There was no different visual score of salinity injury between salinization using tap water and distilled water. Seedling salinity tolerant lines between region and order by year were showed very stable and reproducible results, 3~4.2 of visual score at Gyehwado-substation and International Rice Research Institute (IRRI, Philippines) in 2002, 2003 and 2004. Heading date of 6 selected seedling salt tolerant lines showed a range of 16. Aug.~21. Aug. and delayed 2~6 days than that of Donjinbyeo. Percentage of ripened grain and yield of milled rice in 6 lines was lower, 52.2~14.7% and 50~5%, respectively than those of Donjinbyeo.

해안지역의 지하수 염분화에 대한 시공간적 변화

고병련 ( Byong Ryeon Ko ),최윤영 ( Yun Young Choi ),최정우 ( Jeong Woo Choi ) 한국수처리학회 2015 한국수처리학회지 Vol.23 No.2

In this research, by selecting the east area of Jeju Island as the study object area where the salinization phenomenon appears severely, physicochemical water quality analysis about 32 tube wells of underground water and springs of 15 points was conducted. Then, the distribution properties of underground water quality composition which were acquired from the water quality analysis result and the correlation of ion components according to sea water intrusion were interpreted. First, at the result of assorting water quality properties per zone in March and September by Back’s classification type, Kujwa and Sungsan districts presented water quality composition of types of Cl-SO4 and Cl-SO4-HCO3. Next, Cl concentration of the analysis area showed high correlation of 0.83 to 0.84 with Na. Correlativity of SO4, Mg, K, and EC was about 0.08, and it was represented high. However, it was analyzed that there was no correlation of Ca and HCO3. At the result of finding correlation of analysis values of Sr and F as micro-elements related with Cl, the correlativity was presented high. In case of underground water showing the salinization phenomenon, values of Na+K and Cl are represented high. In case of underground fresh water, values of Mg and HCO3 were represented high. Lastly, to extract ion component elements which become the cause of salinization, from the result of comparing and examining the correlation by the SAS statistics method, correlations of Cl and Na which can judge salinization were 0.84 in case of Kujwa district and 0.83 in case of Sungsan district. Hence, comparatively strong correlation was represented.

조석에 따른 제주도 동부지역 염지하수의 수질특성

오윤근 제주대학교 해양연구소 2000 해양과환경연구소 연구논문집 Vol.24 No.-

The salinization of groundwater is widely known as one type of water contamination in all over the coastal area. To investigate this salinization of groundwater, the various approaches are needed because its characteristics is widely changed from area to area and from time to time, depending on the aquifer conditions. The purpose of this study is to investigate the physical and chemical characteristics of salinization of groundwater at the east area of Jeju island. For this purpose, the major ions of groundwater, are analyzed according to the well depth and tidal levels. The results obtained from this study are summarized as follows : At D -28 well, the deeper the well depth, the greater the degree of water quality fluctuation with tidal levels. However. this phenomenon is appeared inversely at D-124 well. This difference is due to the existence of the specific permeation structure such as cracks and joints at the same level with mean sea level at their location. It is found that time la9 between tidal level and the fluctuation of water quality is 2∼2.5 hours at D-28 well. and 3∼3.5 hours at D-124 well. As the depth of well is deeper. the concentrations of major ions are increased, excepting the case of NO3- originated from the land sources.

조석에 따른 제주도 동부지역 염지하수의 수질특성

오윤근 제주대학교 해양연구소 2000 해양자원연구소연구보고 Vol.24 No.-

The salinization of groundwater is widely known as one type of water contamination in all over the coastal area. To investigate this salinization of groundwater, the various approaches are needed because its characteristics is widely changed from area to area and from time to time. depending on the aquifer conditions. The purpose of this study is to investigate the physical and chemical Characteristics of salinization of groundwater at the east area of Jeju island. For this purpose. the major ions of groundwater. are analyzed according to the well depth and tidal levels. The results obtained from this study are summarized as follows: At D-28 well. the deeper the well depth, the greater the degree of water quality fluctuation with tidal levels. However. this phenomenon is appeared inversely at D-124 well. This difference is due to the existence of the specific permeation structure such as cracks and joints at the same level with mean sea level at their location. It is found that time lag between tidal level and the fluctuation of water quality is 2-2.5 hours at D-28 well. and 3-3.5 hours a t D-124 well. As the depth of well is deeper. the concentrations of major ions are increased. excepting the case of NO_(3)^(-) originated from the land sources.

해수면 상승으로 인한 지하수 해수침투 및 토양 염류화 합성 평가모델

정은태,박남식,조광우 한국수자원학회 2017 한국수자원학회논문집 Vol.50 No.6

기후변화에 따른 해수면 상승으로 인하여 해안지역의 지하수계에 해수침투가 가중된다. 지하수의 염분농도가 증가하면 지하수면 상부의 불포화 토양에서도 염분 농도가 증가할 수 있으며, 이는 농경지에서 작물피해를 일으킬 수 있다. 해수면이 상승함에 따라 내륙의 지하수위도 함께 상승한다. 이는 불포화 토양층의 두께를 감소시켜 해안 저지대의 경작에 피해를 끼칠 수 있다. 본 연구에서 지하수 해수침투는 3차원 모델, 토양 염류화 평가는 연직 1차원 모델을 합성 적용하여 해안 농경지에 대한 해수면 상승 피해를 평가하는 방법을 개발하였다. 3차원 해수침투 모델에서 지하수면의 수위 와 농도분포를 계산하고 최상부 절점 중에서 염분 농도가 기준 값 이상인 절점에서 지하수면과 지표면 사이의 토양층에서 연직 1차원 모델링으로 토양층의 염분 농도와 불포화대 두께를 계산하였다. 농경지의 토양 염류화는 작물의 뿌리 심도에서 보통 작물의 생육한계 염분농도를 기준으로 판 단하였다. 개발된 모델링 방법을 가상의 간척농경지에 적용하였다. 해수면 상승자료로 IPCC의 RCP 4.5와 8.5 시나리오를 사용하였다. 평가 결과 는 2050년과 2100년에 대하여 제시하였다. 연구결과 대상지역에서 기후변화 시나리오 RCP 8.5에서 2100년에는 지하수 염류화 피해 면적은 간 척지 육지면적 대비 7.8%, 염류화 토양 면적은 6.0%, 불포화층의 두께가 뿌리심도보다 적은 지역의 면적은 1.6% 증가하는 것으로 분석되었다. Sea level rise, accompanied by climate change, is expected to exacerbate seawater intrusion in the coastal groundwater system. As the salinity of saturated groundwater increases, salinity can increase even in the unsaturated soil above the groundwater surface, which may cause crop damage in the agricultural land. The other adverse impact of sea level rise is reduced unsaturated soil thicknesses. In this study, a composite model to assess impacts of sea level rise in coastal agricultural land is proposed. The composite model is based on the combined applications of a three dimensional model for simulating saltwater intrusion into the groundwater and a vertical one dimensional model for simulating unsaturated zone flow and transport. The water level and salinity distribution of groundwater are calculated using the three dimensional seawater intrusion model. At some uppermost nodes, where salinity are higher than the reference value, of the 3D mesh one dimensional unsaturated zone modeling is conducted along the soil layer between the ground water surface and the ground surface. A particular location is judged salinized when the concentration at the root-zone depth exceeds the tolerable salinity for ordinary crops. The developed model is applied to a hypothetical agricultural reclamation land. IPCC RCP 4.5 and 8.5 scenarios were used as sea level rise data. Results are presented for 2050 and 2100. As a result of the study, it is predicted that by 2100 in the climate change scenario RCP 8.5, there will be 7.8% increase in groundwater saltwater-intruded area, 6.0% increase of salinized soil area, and 1.6% in increase in water-logging area.

Estimation of Economic Value for Disadvantage of Agricultural Soil

Young Kyu Hong,Jin Wook Kim,Byung Keun Hyun,Hyuck Soo Kim,Jae E. Yang,Sung Chul Kim 한국토양비료학회 2021 한국토양비료학회지 Vol.54 No.1

Agriculture soil can contribute adverse effect on ecosystem and total of 4 major adverse effect of agriculture soil was evaluated for estimating economic value. Soil salinization, soil pollution, soil loss, and greenhouse gas production were evaluated. Result showed that total of 20.2 trillion won was estimated and 10.7 trillion won could be loss due to soil salinization followed by 7.8 trillion won by soil pollution. Soil loss would be cost 1.5 trillion won and greenhouse gas emission might cost 1,296 billion won due to methane and nitrogen oxide emission. The highest economic loss was occurred because of over used fertilizer causing soil salinization followed by soil pollution of heavy metal or pesticide. Overall, reduction of overused fertilizer and best management practice of hazard materials in agricultural field would be the most important factors to minimize disadvantage of agriculture soil.

섬진강 염화에 의한 유역 시설재배단지 토양의 염류집적 가속화

이슬비 ( Seul Bi Lee ),홍창오 ( Chang Oh Hong ),오주환 ( Ju Hwan Oh ),김필주 ( Pil Joo Kim ) 한국환경농학회 2008 한국환경농학회 학술대회집 Vol.2008 No.2