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토지피복 상태와 강수조건을 고려한 장기 지하수함양량 추정
안승섭(Ahn Seungseop),이상일(Lee Sangil),오영훈(Oh Younghun) 한국지반환경공학회 2012 한국지반환경공학회논문집 Vol.13 No.7
강수량의 변화가 지하수 함양특성에 미치는 영향을 검토하기 위하여 대상 유역의 최근 30년간(1980년~2010년) 기상개황 자료로 SWAT모형을 이용하여 대표 강우년별(최다, 평균, 최갈수년) 수문인자를 도출하였으며, Markov Chain모형을 이용하여 추정된 토지이용 자료를 SWAT모형에 적용하였으며, 분석 결과 다음과 같은 결론을 얻을 수 있었다. SWAT모형을 이용하여 본 연구대상지역을 대표 3개 유역으로 구분하고, 1975∼2010년까지의 기상자료에 년도별 토지이용 상태로 적용·분석한 결과, 적용 기간 평균 지하수 함양률은 30%로 분석되었다. 이러한 연구결과는 기존의 제주지역 지하수 함양량 분석연구에서 나타난 40-50%보다 훨씬 적은 값으로 나타나고 있음을 알 수 있었다. 이 결과는 투수성 다공질 지층이 제주지역의 지질특성을 고려하더라도 개발형태가 비투수성 포장형태이고, 개발된다면 육지지역과 같은 지하수함양특성과 비슷할 수밖에 없음을 알 수 있었으며, Markov-chain을 이용한 장래토지이용상태를 분석한 결과 장래의 토지이용은 2000년 현재에 비해 산림 3.4%감소, 농경지 0.2% 증가, 수계 1.0% 증가, 도심지 0.5%증가 하는 것으로 나타났다. Six land use data for a total of twenty five years were reviewed from 1975 to 2000 by dividing the period by 5-year unit; the land use variation was schematized; the watershed hydrological parameters were extracted by the representative rainfall years(maximum, average, driest year) by analyzing the recent thirty years"(from 1980 to 2010) climate data of the study region with SWAT model to investigate the effect of the precipitation change on the characteristics of groundwater recharge. In addition Markov Chain model was used to estimate the future land use; the predicted land use was applied to study the effect of the land use variation on the characteristics of groundwater recharge. For the research of this, long-term characteristics of groundwater recharge were estimated for the study region; the obtained results can be described as follows. The study region was divided into typical three area using SWAT model; yearly land use conditions were applied to the meteorological data of 1975 to 2010 and analyzed, producing the average rate of groundwater recharge of 30% for the applied period. This number is way lower than that of the earlier studies on the groundwater recharge for Jeju Island, which is 40-50%. Thirty percent (30%) is low considering the geological characteristics of Jeju, water-permeable vesicular strata, the reason of which must be the type of development is non-permeable paving.
An Analysis of the Groundwater Flow s Characteristics Following CLIMATE CHANGES
Gwangbok Choi,Seungseop Ahn,Kibum Park J-INSTITUTE 2021 International Journal of Human & Disaster Vol.6 No.4
Purpose: The purpose of this study is to estimate the groundwater volume available in the Gyeongju region and predict changes in the groundwater flow s characteristics based on the IPCC RCP climate scenario. Method: As for the method to carry out this study, the results of forecasting the weather conditions in the Gyeongju region based on the IPCC RCP climate change scenario were used. By using the predicted precipitation data, the groundwater volume available was analyzed by using the SWAT MODEL. To analyze the groundwater flow s characteristics, the future groundwater flow s characteristics were analyzed by using MODFLOW by using the observed water level related data. Results: When examining the content by scenario, and across all scenarios, it was analyzed that the M3 basin was the largest, followed by the M2 basin and the M1 basin, respectively. It was also analyzed to be inversely proportional to the size of the outflow hydrologic curve in the case of the M1 basin as the city area was greater than that of the M2 and M3 basins. It was analyzed that the scenario of RCP 2.6 had the lowest variation for the content by basin, and that RCP 4.5 had the largest variation by basin. In terms of the flow direction of the groundwater, the M3 basin flows from the mountainous terrain to the Deokdongcheon Stream along the Deokdong Lake, and the M2 basin flows from the south towards the direction of the Bomun Lake. The M1 basin was analyzed to be the Bukcheon basin and finally flows towards the west side of the Hyeongsan River, and the overall groundwater flow in the target basin was analyzed to flow along the river towards the west side of the Hyeongsan River. Conclusion: As a result of analyzing the groundwater volume available and flow’s characteristics in the Gyeongju region according to climate changes in this study, the amount of groundwater volume available in the future RCP scenario both increased in 2100 compared to the current precipitation. Yet, in the case of RCP 4.5, the duration of no precipitation decreased by 57.75% compared to 2020, and RCP 8.5 increased by 56.79%, and hence, it was analyzed that, as for the available volume in 2100, the RCP 4.5 scenario was calculated to be 6.93% higher than the present, and the RCP 8.5 scenario increased by 0.10% compared to the present. In 2100, when there was no precipitation for 40 or more days, it was analyzed that the groundwater level decreased for RCP 4.5 by 0.7 m on average, and as for RCP 8.5, it was analyzed to decrease by GL by 1.0 m, and hence, the water level’s decrease turned out to be very large for the RCP 8.5 scenario. As a result of the groundwater flow analysis, it was analyzed that it was advantageous for securing the groundwater because of the high groundwater volume available and the groundwater level in the RCP 4.5 scenario where the greenhouse gas reduction policy was significantly realized.
Study on Storytelling Contents Preference for Waterfront Area Construction
Ki-Bum Park,SeungSeop Ahn,MiJung Kim,SoYoon Park 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.4
In this study, a present situation survey of users was done for the construction of waterfront area, and user preference was surveyed in applying new contents. For the survey, Shin stream and Susung pond, located at the center of Daegu city, and Palgeo stream, located on the outskirts of residential areas were selected. Through the result of the present situation survey, it was possible to identify the main user ages, facilities in use, and purposes, where the main user ages were at least 40s who primarily used for exercise and walking. The demands for new contents were found to have various requirements such as movies, educational space, diversification of exercise facilities, and festivals. Indicators such as location, age group, accessibility, and etc. could be set as indicators to be considered in developing waterfront areas to which storytelling is applied using the survey results