최소 단어 이상 선택하여야 합니다.
최대 10 단어까지만 선택 가능합니다.
다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
NTIS 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
DataON 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Edison 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Kafe 바로가기주관연구기관 | 한국지질자원연구원 Korea Institute of Geoscience and Mineral Resources |
---|---|
연구책임자 | 김용철 |
참여연구자 | 고경석 , 고동찬 , 김동훈 , 김성균 , 김용제 , 김형찬 , 문상호 , 문희선 , 석희준 , 신제현 , 심병완 , 윤윤열 , 윤희성 , 이길용 , 이병대 , 이봉주 , 이수형 , 이영민 , 이은희 , 이현주 , 정병주 , 조병욱 , 조수영 , 최한나 , 하규철 , 황세호 , 김태희 , 박찬희 , 이철우 , 윤욱 , 오용화 , 박동규 , 배순임 , 권홍일 , 오설란 , 한지연 , 이정윤 , 유은총 , 김상윤 , 황인환 , 안효원 , 서형준 |
보고서유형 | 최종보고서 |
발행국가 | 대한민국 |
언어 | 한국어 |
발행년월 | 2019-12 |
과제시작연도 | 2019 |
주관부처 | 과학기술정보통신부 Ministry of Science and ICT |
등록번호 | TRKO202000005449 |
과제고유번호 | 1711096632 |
사업명 | 한국지질자원연구원연구운영비지원(R&D)(주요사업비) |
DB 구축일자 | 2020-07-29 |
키워드 | 기후변화.지하수.수문지질단위.지하수의존생태계.지열.Climate change.groundwater.hydrogeologic unit.groundwater-dependent ecosystem.geothermal. |
최종(연차) 목표
기후변화 대응 지하수/지열 자원확보 및 생태보전을 위한 지하수 융합평가 기반 구축
- 지역/지질 맞춤형(SMART) 지하수-지열 융합 시스템
(파일럿 시설 연간 1만5천톤, 35 kW이상)
- 대표유형별(하천/습지/호소) 지하수의존생태계 물/물질순환 평가 현장적용
- 기후변화에 따른 지하수의존생태계(지하수/지열/생태계) 예측분포도 작성
(중수계 2개 규모 >1,000km2)
개발내용 및 결과
기후변화에 대응하여 지하수자원을 확보하고 지하수의존생
최종(연차) 목표
기후변화 대응 지하수/지열 자원확보 및 생태보전을 위한 지하수 융합평가 기반 구축
- 지역/지질 맞춤형(SMART) 지하수-지열 융합 시스템
(파일럿 시설 연간 1만5천톤, 35 kW이상)
- 대표유형별(하천/습지/호소) 지하수의존생태계 물/물질순환 평가 현장적용
- 기후변화에 따른 지하수의존생태계(지하수/지열/생태계) 예측분포도 작성
(중수계 2개 규모 >1,000km2)
개발내용 및 결과
기후변화에 대응하여 지하수자원을 확보하고 지하수의존생태계의 건전성을 확보하기 위하여 수문지질단위 재정립, 지하수부존특성 평가(금강권역), 지하수의존계 요소(지하수(한반도규모)/지열(남한규모)/생태계(금강유역규모)의 미래변화예측, 하천/습지/호소환경의 지하수의존계 물/물질순환 평가, 융복합 천부지열시스템 개발평가를 수행
기대효과
국가 물관리일원화 및 지하수-지표수 통합관리 등 새로운 국가 물관리 정책과 이상 기후 및 가뭄 등 변화하는 기후환경 하에서 국가 수자원의 안정적 공급 체계를 구축할 수 있는 기반 기술을 제공하고 지속가능한 물 안보 확보에 기여
적용분야
지하수정보지도 및 지하수의존계 미래예측도는 기후변화에 따른 가뭄 등의 자연재해에 대비하여 수자원 확보와 지하수의존계 물순환 건전성 확보를 위한 정부와 지자체의 전략 및 정책 수립에 활용
(출처 : 요약서 5p)
< Evaluation of Groundwater Presence Characteristics by Hydrogeological Units>
3D-subsurface geologic modeling can provide basic data for evaluating the geological characteristics of aquifer and can be useful for evaluating groundwater occurrence characteristics etc.. To evaluate the subsurface g
< Evaluation of Groundwater Presence Characteristics by Hydrogeological Units>
3D-subsurface geologic modeling can provide basic data for evaluating the geological characteristics of aquifer and can be useful for evaluating groundwater occurrence characteristics etc.. To evaluate the subsurface geological characteristics, alluvial / bedrock and geological classification were performed, and 3D-multi logs and stratigraphic modeling and cross-section were performed. Subsurface geologic distribution is based on geological studies and can be used as basic data for groundwater occurrence characteristics and groundwater flow modeling studies.
< Evaluation of Possible Development of Shallow Geothermal Energy>
Demonstration facilities were installed in the KIGAM SPOREX building to test a closed-loop / open-loop hybrid borehole heat exchanger (BHE) pilot system. In order to evaluate the performance, several experiments according to organized operation modes during heating and cooling season are conducted. The performance data measured from temperature sensors, heat pump and submersible pump electricity consumption meters, water levels and flow rates sensors were automatically saved in the monitoring system. The system with the hybrid BHE represented sustainable performance even though long-period peak load for heating and cooling is continued.
The environmental changes on the aquifer from the shallow geothermal system operation were analyzed with water chemistry monitoring, isotope and microbiological analysis at the study site. The comprehensive surveys represented the characteristics of each well and the movement of groundwater. In addition the surface-groundwater interaction in response to a pumping test conducted with ground source heat pump in shallow depths. Analyzing the groundwater level changes versus time at 5 monitoring wells, we could estimate the hydraulic parameters of the ground. The numerical methods for the evaluation of shallow geothermal potential are developed by upgrading the basic simulator from TOUGH-MP to TOUGH3 and added adding new calculation modules for geothermal heating and cooling systems. National scale geothermal thematic maps on ground thermal conductivity, geothermal gradient, heat flux, heat production were upgraded by adding new data and sampling. In this version, the data of Jeju island, Ulleung island and Dokdo island are included. Thermal properties of soil were measured near the SPOREX building in KIGAM to evaluate the effect of the soil layer on the hybrid BHE system installed in the building. In addition, the thermal properties of soil near the National Groundwater Monitoring wells in the Gum River basin were measured. Measured thermal property data can be used for numerical modeling to predict the future groundwater-dependent ecosystem of the Gum River basin
< Evaluation of Groundwater-Surface Water Interaction Evaluation in Urban Areas>
Urban development continuously converts agricultural and forest lands to an impervious surface and affects hydrogeological parameters such as infiltration, evapotranspiration, and runoff rates. It eventually moves dynamic equilibrium of surface water and groundwater interaction and exerts negative effects on the quality of urban life. We have quantified land use changes during the development and modeled the hydrological response of the Banseok catchment in Daejeon area to estimate urbanization effects on excess rainfall and runoff. According to the results, the urbanization and accompanying deforestation induce more intense runoff to the stream compared to that of a pre-development stage. This may imply the downstream in developed area becomes more susceptible to be flooded.
< Evaluation of Groundwater-Surface Water Interaction in Rural Areas>
Groundwater dependent ecosystems in agriculural riparian zones were characterized by multiple techniques for the Noseongcheon watershed in northern Nonsan. Upstream reaches had significant base flow while downstream reaches had lower base flow and changed to losing conditions in some points through water level monitoring, stream discharge measurements, water flux through streambed, natural environmental tracers, which can be attributed heavy pumping. Nutrients such as nitrate and phosphate are correlated with land uses, groundwater uses, and soil properties. Microbial community structures in groundwater showed site-specific bacteria and pathogenic E coli. in some areas. Overall, streamwater and groundwater are found to be closely related to each other in the agricultural riparian zones, which suggests integrative management of the stream and the aquifers is required.
< Evaluation of Groundwater-Surface Water Interaction in Coastal Areas>
In order to evaluate the characteristics of the coastal aquifer, water samples were collected at dry and rainy seasons from 101 groundwater, reservoirs, and rivers. The survey area is a 20 × 30 km in Seocheon-gun, and the analysis results are presented in various map. The relationship between the water quality analysis results and the altitude of the coastal aquifer is as follows. Groundwater analysis showed a high trend in low altitude areas, while DO and pH tended to be somewhat high at high altitudes.
Reservoir and river water are mostly located at low altitude, so no water quality difference could be observed. Rn content of groundwater was measured in the range of 0-7390 Bq/L at the first stage and 0-8800 Bq/L at the second stage. High Rn was detected in the area around Pangyocheon stream and along the coast of Sinjo-ri and Jangpo-ri. Particularly, boreholes with 8,800 Bq/L were found, which increased tenfold during the second phase. The characteristics of ground water table variation were identified by conducting a two-dimensional analysis considering the changing rainfall intensity and distribution characteristics in time and space, assuming an anisotropic unconfined aquifer under arbitrary slope with multiple wells. In addition, the control equation for saline concentration gradient, for reflecting the variation of interface between freshwater and saline water due to tide, was established. And then GITT technique was used to develop analytical solution for saline concentration gradient.
Characteristics of the interface variation was studied by performing sensitivity analysis using the analytical solution. Geophysical logging, water sampling and analysis were performed to identify seawater intrusion in the observation wells of coastal aquifers.
The natural gamma log, which measures the natural radioactivity intensity of the formation, showed a good tendency with Rn analysis. We found that the electrical conductivity, water quality logging, and Rn data were in good consistency at the freshwater-salt interface.
< Groundwater Dependent Ecosystem (Wetland) Water / Mass Exchange Quantification Technology Development>
Wetlands, which is a representative groundwater-dependent ecosystem, have been considered as valuable ecosystems because they can serve as sinks for nutrients such as nitrogen, attenuating the release of nutrients into environment. Recent increases in the frequency of extreme floods and droughts associated with climate change can affect the hydrologic conditions in wetland environments (i.e., surface water and groundwater levels) and consequently cause changes of redox condition in nitrogen biogeochemical processes in wetland sediments. In this study, the Baekseok Reservoir Wetland (Gunsan-si, Jeonbuk province, Korea) was investigated to understand seasonally nitrogen dynamics in wetland sediments responding to surface and groundwater interaction. In order to understand the interaction between surface water and groundwater, we applied drilling and geophysical exploration methods to estimate the spatial distribution of sedimentary layers within and around the wetland. In addition, the electrical resistivity and physical logging methods for understanding the distribution of sedimentary layers were used to derive the hydrogeological characteristics of the interaction between surface and shallow groundwater. The hydraulic differences between sedimentary and weathering zones are expected, and groundwater flow is expected to be below the mud deposit known as impermeable.
Electrical resistivity survey data shows that the electrical resistivities from 42 to 71 ohm-m agree well with the depth of the sedimentary layer. The depth of the sedimentary layer increases from the north to the south, and the inside of the wetland is estimated to be distributed to about 20 m. In addition data indicated that there are differences in the hydraulic characteristics of each borehole. There was little vertical change in water quality logs through the sediment and weathering zones at each borehole. The 222Rn activities in the surface water and porewater were monitored to quantify groundwater inflow rate and investigate groundwater flow system of the wetland. The highest groundwater inflow rate in September may be due to relatively high hydraulic gradient induced by the concentrated rainfall in the summer season. The water residence time of the wetland estimated using the results of 222Rn mass balance showed similar values (about one month) regardless of seasons. In addition, we monitored the seasonal nitrogen dynamic with sediment depths (< 1m) in three different sites (PA, PB, and PC) in the The various nitrogen compounds (i.e., TDN, NO3-, NO2-, and NH4 ) and dissolved organic carbon (DOC) concentration in pore water with depths were periodically monitored from April, 2018 to Jun, 2019 and nitrogen-related functional genes in each sediment depths were also analyzed. The results showed that DOC, DTN, and NH4 concentrations were well correlated and nitrogen depth profiles in sediment were significantly different from locally and it is probably due to hydrologic conditions at the study sites such as surface water and groundwater interaction driven by rainfall events and redox condition. The overall microbial gene abundance was higher in summer than winter, and nrfA gene was relatively abundant compared to denitrification-related genes.
< Groundwater Dependent Ecosystem (Lake) Water / Mass Exchange Quantification Technology Development>
Here, we conducted a multidisciplinary integrated studies to development of water / mass exchange assessment method and evaluate the ecological characteristics of groundwater-surface water interaction in groundwater dependent ecosystem. General subsurface geologic characteristics of study area was classified into three sections including soil-sand, sand & gravel-weathered zone, and bedrock, based on drilling topography. he permeable structure was largely classified into sand layer and sand & gravel layer. The groundwater-surface water interactions were evaluated through long-term monitoring of groundwater levels in study area. Generally, groundwater levels were varied depending on the sample sites and wells near the Geum River tend to has greater hydrulic constants. The GPR survey was used to spatially estimate the change of groundwater level according to the change of water level of Baekje weir. In addition, various geophysical logs were performed at the multi-depth observation well to identify the characteristic changes. A buoy-type seepage meter was installed to estimate the groundwater flux before and after open the weir and the flux was ranged from a minimum of 1.3E-5 m/d to a maximum of 5.6E-4 m/d.
Surface and groundwater qualities were used to evaluate hydraulic chemical properties and groundwater-surface water interaction. As the result of groundwater level changes according to the weir open, the MW-2 (15 m) well was most affected well by the surface water level among the multi-depth observation wells. Through continuous monitoring of the concentration of Rn-222 in the surface water, it was observed that the radon concentration began to increase and maintained constantly as the surface water decreased as the opening was maintained. The multi-depth wells water qualities shows clear difference on the piper diagram because the water quality was affected by different aquifer depending on the different depth of the well. The spatial hydrochemical characteristics of the alluvial aquifer in the study area were found to have different water quality zones according to the vertical distance from the Geum River, and the anion compositions were influenced on the water type of the groundwater. Modeling techniques were applied for analyze the groundwater flow and water balance, and groundwater level predictions of study area according to the artificial surface water level changes. In the aspects of water balance, 55% (3,500 m3/d) of groundwater was flowed from the basin and 43% (2,700 m3/d) was recharged from rainfall. And the amount of pumping and discharge to river was 67%(4,200 m3/d) and 32% (2,000 m3/d), respectively. Futhermore, groundwater level could be perfectly reproduced by the combination of precipitation, surface water level and background groundwater level, and the hydraulic conduction around the well could also be calculated. To evaluate the ecological characteristics of groundwater-surface water interactions, spatial and temporal microbial community structures were analyzed. Based on the microbial community changes in groundwater and surface water in the study area, it is possible to indirectly identify the groundwater connectivity at each point, and evaluate the biogeochemical characteristics of groundwater-surface water interactions.
< Prediction of Groundwater Dependent Ecosystem (Ground Water/ Geothermal / Ecosystem) According to Climate Change>
Climate change is of great importance in recent years because of its social, economic and environmental significance. In this study, we predicted the spatio-temporal variability of groundwater recharge rate and groundwater level in the Korean Peninsular under different RCP scenarios (RCP2.6, 4.5 and 8.5). Our prediction model results indicated that climate change would lead to the substantial change in groundwater environment of Korea. The predicted groundwater recharge rates was the highest under the RCP2.6 and the lowest under the RCP8.5. Variations in the forecasted groundwater levels were generally influenced by the spatio-temporal pattern of groundwater recharge and topographical features, and the groundwater system in the high altitude area will be more vulnerable to climate change.
Next, we used future climate change scenarios RCP2.6, RCP4.5, RCP8.5, and about 3,000 thermal diffusivity data to predict subsurface temperatures in Korea. At the depth of 10 m, Korea's mean subsurface temperature in the year of 2,100 is expected to rise 1.35 K for RCP2.6, 2.51 K for RCP4.5 and 4.31 K for RCP8.5, respectively. The predicted subsurface temperatures in Korea can be used as an important factor to study future hydrogeological changes, hydrogeochemical changes, microbiological changes, and other geological and ecological changes due to increasing temperature.
Finally, integrated hydrologic simulations of the Geum River Basin (GRB) were presented to forecast the impact of climate change on water resources within the GRB and to predict long-term drainage patterns in both the surface water and groundwater regimes within the basin. The model results indicates that the surface water system in GRB will be strongly influenced by the future climate change, showing general increase in surface water depth and water discharge rate, particularly under the RCP4.5. The predicted groundwaer-surface water exchange fluxes from all RCP scenarios showed less groundwater infiltration compared to present conditions and the exfiltration would be similar to slightly decrease than current conditions.
HyGEMS (Hybrid Groundwater Environment Monitoring System) has been continuously established for observation/investigation to monitor the impact of groundwater systems on future climate change. HyGEMS has been installed for three years (2017-2019) and monitoring systems have been established in 11 locations. The monitoring items are complex monitoring systems (groundwater soil weather).
HyGEMS continuously monitors groundwater to prepare for climate change and natural disasters, so it will be used for future water resource policies and stable water resource protection policies.
(출처 : SUMMARY 19p)
과제명(ProjectTitle) : | - |
---|---|
연구책임자(Manager) : | - |
과제기간(DetailSeriesProject) : | - |
총연구비 (DetailSeriesProject) : | - |
키워드(keyword) : | - |
과제수행기간(LeadAgency) : | - |
연구목표(Goal) : | - |
연구내용(Abstract) : | - |
기대효과(Effect) : | - |
※ AI-Helper는 부적절한 답변을 할 수 있습니다.