• Title/Summary/Keyword: 수혜면적

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Development of Naïve-Bayes classification and multiple linear regression model to predict agricultural reservoir storage rate based on weather forecast data (기상예보자료 기반의 농업용저수지 저수율 전망을 위한 나이브 베이즈 분류 및 다중선형 회귀모형 개발)

  • Kim, Jin Uk;Jung, Chung Gil;Lee, Ji Wan;Kim, Seong Joon
    • Journal of Korea Water Resources Association
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    • v.51 no.10
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    • pp.839-852
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    • 2018
  • The purpose of this study is to predict monthly agricultural reservoir storage by developing weather data-based Multiple Linear Regression Model (MLRM) with precipitation, maximum temperature, minimum temperature, average temperature, and average wind speed. Using Naïve-Bayes classification, total 1,559 nationwide reservoirs were classified into 30 clusters based on geomorphological specification (effective storage volume, irrigation area, watershed area, latitude, longitude and frequency of drought). For each cluster, the monthly MLRM was derived using 13 years (2002~2014) meteorological data by KMA (Korea Meteorological Administration) and reservoir storage rate data by KRC (Korea Rural Community). The MLRM for reservoir storage rate showed the determination coefficient ($R^2$) of 0.76, Nash-Sutcliffe efficiency (NSE) of 0.73, and root mean square error (RMSE) of 8.33% respectively. The MLRM was evaluated for 2 years (2015~2016) using 3 months weather forecast data of GloSea5 (GS5) by KMA. The Reservoir Drought Index (RDI) that was represented by present and normal year reservoir storage rate showed that the ROC (Receiver Operating Characteristics) average hit rate was 0.80 using observed data and 0.73 using GS5 data in the MLRM. Using the results of this study, future reservoir storage rates can be predicted and used as decision-making data on stable future agricultural water supply.

Analysis of Land Cover Change from Paddy to Upland for the Reservoir Irrigation Districts (토지피복지도를 이용한 저수지 수혜구역 농경지 면적 및 변화 추이 분석)

  • Kwon, Chaelyn;Park, Jinseok;Jang, Seongju;Shin, Hyungjin;Song, Inhong
    • Journal of The Korean Society of Agricultural Engineers
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    • v.63 no.6
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    • pp.27-37
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    • 2021
  • Conversion of rice paddy field to upland has been accelerated as the central government incentivizes more profitable upland crop cultivation. The objective of this study was to investigate the current status and conversion trend from paddy to upland for the reservoir irrigation districts. Total 605 of reservoir irrigation districts whose beneficiary area is greater than 200 ha were selected for paddy-to-upland conversion analysis using the land cover maps provided by the EGIS of the Ministry of Environment. The land cover data of 2019 was used to analyze up-to-date upland conversion status and its correlation with city proximity, while land cover change between 2007 and 2019 was used for paddy-to-upland conversion trend analysis. Overall 14.8% of the entire study reservoir irrigation area was converted to upland cultivation including greenhouse and orchard areas. Approximately the portion of paddy area was reduced by 17.8% on average, while upland area was increased by 4.9% over the 12 years from 2007 to 2019. This conversion from paddy to upland cultivation was more pronounced in the Gyoenggi and Gyeongsang regions compared to other the Jeolla and Chungcheong provinces. The increase of upland area was also more notable in proximity of the major city. This study findings may assist to identify some hot reservoir districts of the rapid conversion to upland cultivation and thus plan to transition toward upland irrigation system.

Research on Changes and Characteristics of GHG Emissions by Major Energy-consuming Universities in Korea - Focused on the variation since the implementation of GHG emission regulation by Government - (에너지 다소비 대학의 온실가스 배출 변화와 특성 - 온실가스 배출 규제 시행 이후의 변화를 중심으로 -)

  • Jung, Hyejin;Kim, In Chol
    • Korean Journal of Construction Engineering and Management
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    • v.18 no.1
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    • pp.74-82
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    • 2017
  • It is known that energy usage from Korean Universities was growing rapidly in the early 2000s. But since 2011, the change was caused by GHG emissions regulation enforced by the government. The purpose of this research was to find the characteristics and trends of greenhouse gas emissions from major universities in Korea according to the each university's data and information. The result shows that GHG emissions from University have increased steadily prior to enforcement by 4-5% annually, but the rate of increase marked 0.5~1% in 2011~2013 is the season of emission regulation and the total amount of emissions decreased 3%~5% in 2014~2015 while preparing an emissions trading scheme. Therefore we can say that the enforcement of GHG reduction such as energy target management system makes a visible effect at least in the University sector that level of GHG emissions is from $75kg/m^2$ to $58Kg/m^2$ for seven years. Another result says that the size of research fund is the main factor that affects the amount of GHG emissions before 2011, but the size of building area has been a new factor influencing the GHG emission since 2013. Thus we suggest that the criteria for evaluating the level of GHG emission from University is suitable if it is based on the building area intensity.

Estimation of irrigation return flow from paddy fields on agricultural watersheds (농업유역의 논 관개 회귀수량 추정)

  • Kim, Ha-Young;Nam, Won-Ho;Mun, Young-Sik;An, Hyun-Uk;Kim, Jonggun;Shin, Yongchul;Do, Jong-Won;Lee, Kwang-Ya
    • Journal of Korea Water Resources Association
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    • v.55 no.1
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    • pp.1-10
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    • 2022
  • Irrigation water supplied to the paddy field is consumed in the amount of evapotranspiration, underground infiltration, and natural and artificial drainage from the paddy field. Irrigation return flow is defined as the excess of irrigation water that is not consumed by evapotranspiration and crop, and which returns to an aquifer by infiltration or drainage. The research on estimating the return flow play an important part in water circulation management of agricultural watershed. However, the return flow rate calculations are needs because the result of calculating return flow is different depending on irrigation channel water loss, analysis methods, and local characteristics. In this study, the irrigation return flow rate of agricultural watershed was estimated using the monitoring and SWMM (Storm Water Management Model) modeling from 2017 to 2020 for the Heungeop reservoir located in Wonju, Gangwon-do. SWMM modeling was performed by weather data and observation data, water of supply and drainage were estimated as the result of SWMM model analysis. The applicability of the SWMM model was verified using RMSE and R-square values. The result of analysis from 2017 to 2020, the average annual quick return flow rate was 53.1%. Based on these results, the analysis of water circulation characteristics can perform, it can be provided as basic data for integrated water management.

Agricultural Status of Lam Dong Province in Vietnam and the Strategy for Korea-Vietnam ODA International Cooperation Program in Agriculture (베트남 람동성의 농업현황 및 한-벳 ODA 농업협력사업 전략)

  • Cho, Joon-Hyeong;Jang, Hye-Ri;Lim, Jong-Min;Lee, Sok-Young;Kim, Wan-Seok
    • Journal of the Korean Society of International Agriculture
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    • v.23 no.5
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    • pp.465-474
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    • 2011
  • Agricultural environment of Lam Dong province, which is located in central highland area, is totally different from that of other lower areas in Vietnam. In Lam Dong province, abundant plant resources were naturally grown such as pine trees, taxus, and wild orchids, which can grow in high mountainous area. In Lam Dong, the field proportion of perennial crops was higher than that of annual crops. However, the field proportion and yields of vegetables were highest among the all cultivated crops, estimating 38% (36,552ha) and 72% (993,082MT), respectively. Especially in Da Lat, vegetables, flowers, orchids, and industrial crops were mainly produced because this area is geographically close to Ho Chi Minh city. And also in Da Lat, 64% (8,447ha) and 36% (4,777ha) of farm fields were used for producing annual and perennial crops, respectively, and the yields of fresh vegetables in this area was estimated to 213,478MT which was 21.5% of the whole yields in Lam Dong province. Thus Korea, Taiwan, Japan, France, and Holland have invested to agriculture in Da Lat for producing and exporting flowers, vegetables, and tea. In 2009, flower cultivation area of Da Lat was over 55% in Lam Dong province and average amount of values were 9,781 million USD, which was higher than that of al other crops. Thus following strategies could be suggested for the development of agriculture in Lam Dong province. The first, agricultural cooperation with Da Lat, Lam Dong, should be characterized to horticulture and floriculture, followed by supporting both appropriate R&D techniques and equipments. And then agricultural system should be made in relationship with the local companies. Finally, agricultural cooperation program should be conducted toward the direction for both donor and recipient countries.

Verification of Stream Flow by Rainfall-Runoff Simulation and Hydrologic Analysis in Daecheong Basin (수문 특성 분석에 의한 대청유역 주요지점 유출모의 검증)

  • Lee, Sang-Jin;Kim, Joo-Cheol;Noh, Joon-Woo
    • Korean Journal of Ecology and Environment
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    • v.43 no.2
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    • pp.183-189
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    • 2010
  • In this study long term rainfall-runoff model, developed based on SSARR, was applied to Geum river basin and its simulation results of major control points were compared with the corresponding observed channel discharges. The validities of the simulation results were examined with re-measured discharges of those control points. From the above procedure the points showing the unreliable results were found out and its principal causes are analyzed through hydrological inspection of runoff characteristics of their circumstances. Finally the simulation results were modified by the consideration of the effects by small-scale hydraulic structures which could directly affect the channel discharges. As a result the annual runoff simulations of two major points in Geum river basin, Yongdam and Daecheong dam sites, work well. However the low flow simulation of the point located between them, Sutong station, showed more or less the unreliable result. Its causes are considered by means of the hydraulic/hydrological inspection of the corresponding point.

A Study on Affordability of Bogeumzari Housing in Metropolitan Area: Focused on Public Sales Housing, 10-Year Rental Housing, and Shared-ownership Housing (수도권 보금자리주택 대상계층의 지불가능성 분석: 공공분양, 10년임대, 분납임대주택을 중심으로)

  • Choi, Eun-Hee;Kim, Ok-Yeon;Lee, Jong-Kwon
    • Land and Housing Review
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    • v.4 no.4
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    • pp.361-370
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    • 2013
  • The purpose of this paper is to appraise Bogeumzari Housing Program(BHP) which is providing public housing of different types for the target brackets on a matching system basis. Especially, on government's announcing BHP plan with the designation of several Bogeumzari districts in Seoul Metropolitan area, they raised a question about target groups' receiving the benefits of BHP plan and this paper focuses on the question. We tried to analyze two topics. First one is about the exorbitant windfall profits to the future potential residents derived from low price or rental cost of Bogeumzari Housing in comparison with neighborhood's market price. Second one is the low possibility of low-moderate income household's access to absolutely high price Bogeumzari Housing that is because the market price is so high in some area. BHP includes not only long-term public rental hosing(Permeant rental housing, National rental housing) for low income households but also other types of public rental housing(10-year rental housing, shared-ownership rental housing) for moderate income households. So, in this study we tried to find out the affordability of each bracket in three public housing types, which are public sales housing(condominium), 10-year rental housing and shared-ownership rental housing. Through analyzing the housing affordability by types, regions, size, we tried to seek the answer to the controversy and propose policy implications related to the future public housing programs.

A study on the Changes in the water level-flow relationship curve by the operation of Nakyang Weir in the Dongjin River (동진강 낙양 보 운영에 의한 수위-유량 관계곡선식의 변화)

  • Young Jun Ohk;Seung Hyun Kim;Kang Han Lee;Da Jin Lee
    • Proceedings of the Korea Water Resources Association Conference
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    • 2023.05a
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    • pp.312-312
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    • 2023
  • 동진강 유역은 김제평야를 품고 있어 다른 지역에 비해 농지면적이 차지하는 비중이 크며, 이에 따라 전체 용수 사용량에서 농업용수의 비중이 절대적으로 높은 유역이다. 낙양 보는 동진강 중·상류에 위치한 이수시설로 상류에 위치한 섬진강댐과 같이 동진강 유역의 농업용수 공급에 중요한 역할을 하고 있다. 낙양 보는 현재 동진강 방수문 4문, 김제간선 취입수문 2문, 정읍간선 취입수문 1문이 설치되어 있다. 관개기에는 동진강 도수로의 수문을 폐쇄하여 동진강 본류로의 하천유지용수를 차단하고 김제 배수로의 수문을 운용하여 농업용수를 공급하고 있으며 수혜구역의 용수수요 변화 및 기상상황, 하천상황에 따라 탄력적으로 운영하고 있다. 이러한 가동 보 운영으로 인하여 다양한 수위-유량관계의 변동성이 발생한다. 본 연구에서는 가동 보 운영에 따른 수위-유량관계 곡선식의 변동성을 확인하기 위해 동진강 유역 낙양보 상류에 위치한 정읍시(거산교)관측소를 대상관측소로 선정하였다. 정읍시(거산교)관측소는 2012년에 개발된 수위-유량관계곡선을 2021년까지 사용하였고, 2022년 수위-유량관계곡선식 검증과 재개발을 위하여 유량측정을 실시하였다. 2012년에 개발된 수위-유량관계곡선은 검토 결과 강우에 의한 수위 상승시 보 완전 개방 상태의 측정성과를 확보하여 수위-유량관계 곡선식을 개발하였다. 그 결과 가동 보를 운영하는 3월~9월은 상류에 위치한 정읍시(행정교)관측소와 상하류 역전 현상이 발생하였고, 매년 비정상적인 유량이 산정되는 결과를 초래하였다. 2022년 신뢰도 높은 유량자료와 수위-유량관계곡선식 개발을 위해 낙양 보 완전개방 및 부분개방에 따른 다양한 유량측정성과와 낙양 보 수문 모니터링 결과를 확보하였다. 낙양 보는 2022년 1월~3월, 10월~12월은 수문 6문을 완전 개방하여 동진강에 하천유지용수를 공급하고, 4월부터 동진강 방수문을 폐쇄하여 농번기 농업용수를 확보한 후, 5월~9월에 확보된 농용수를 김제 배수문 2문을 부분개방하면서 공급하는 방식이다. 이 기간동안 낙양 보 수문에 대한 모니터링을 위해 정읍시(거산교)관측소 수위자료에 대한 검토를 실시하였으며, 유량측정시에는 정확한 유량측정성과와 곡선식 확인을 위하여 동일한 위치에서 측정을 수행하였다. 또한, 수위 또는 유량이 변하는 구간은 연속측정을 실시하였으며, 모니터링 결과와 유량측정성과를 바탕으로 수위-유량관계 변화를 분석하였다. 그 결과 저수위1식은 수문 완전개방, 저수위2식은 수문 완전폐쇄, 저수위3~6식은 수문 부분개방 곡선식을 개발하였으며, 저수위 구간은 낙양보 운영에 따라 총 27차례 기간분리가 발생하였다. 결과적으로 본 연구에서는 낙양 보 운영에 따른 다수의 유량측정성과와 모니터링 자료를 확보하였으며, 확보한 유량측정성과의 분석을 통한 신뢰도 높은 수위-유량관계곡선식을 개발하였고 이를 통해 생산된 유량자료는 정확도가 매우 높은 것으로 분석되었다.

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Assessment of water resources availability considering complex water use in upstream of the Hantan River Dam (한탄강댐 상류 상세 물이용체계를 고려한 수자원가용량 평가)

  • Jang, Cheol Hee;Kim, Hyeon Jun;Kim, Deok Hwan
    • Proceedings of the Korea Water Resources Association Conference
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    • 2020.06a
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    • pp.252-252
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    • 2020
  • 대하천 주변 광역상수도 공급지역은 가뭄 발생시에도 안정적으로 물이용이 가능하나, 중소하천을 수원으로 하는 하천의 상류지역은 가뭄시 물공급 안정성이 취약하다. 따라서 중소하천을 대상으로 가뭄시 물 공급시설의 효율적 운영, 물부족 위험도 평가, 가용 수자원의 최적이용 등 종합적인 대책 마련을 위해서는 신뢰성 높은 수문량(하천유출량 및 수자원가용량) 예측이 필요하다. 기존의 가뭄시 하천유출량 예측정확도 평가는 통계적 회귀분석을 통한 가뭄지수 기반의 가뭄상황의 예측에 치중하여 불확실성이 크며 국내 유역의 복잡한 물이용체계를 고려하지 않아 시·공간적인 규모에 따라 상이한 결과를 나타내며 실측자료 기반의 하천유출량과 비교하면 정확도가 대부분 60% 이하로 나타난다(이상은 등, 2015). 본 연구에서는 상세 물이용체계를 고려한 정도높은 수자원가용량의 평가를 위하여 한강권역 내의 한탄강댐 상류 유역을 테스트베드로 선정하였다. 한탄강댐 상류유역은 다수의 복잡한 농업용 수리시설 운영에 따른 수자원가용량 예측정확도가 매우 낮은 지역으로 본 연구를 통해 정도 높은 수자원가용량 예측정확도를 확보하기에 적정한 유역이라 판단하였다. 수자원가용량을 평가하기 위한 모형은 한국건설기술연구원에서 개발된 CAT3.1(Catchment hydrologic cycle Assessment Tool 3.1)을 이용하였다. CAT 3.1은 중소하천 유역내의 인위적인 물이용체계(광역급수, 재이용, 지하수 취수, 하천수 취·배수 등)를 반영한 수문량(하천유출량 및 수자원가용량) 평가 및 예측이 가능한 모형으로 기존 개념적 매개변수 기반의 집중형 수문모형과 물리적 매개변수 기반의 분포형 수문모형의 장점을 최대한 집약하여 개발되었다. 한탄강댐 상류유역의 물리적 매개변수는 최대한 기 구축된 GIS 자료를 활용하여 추출하였다. 토지이용현황은 산림과 농업지역이 대부분을 차지하여 농업용수 공급이 대부분인 물이용체계를 가지고 있다. 따라서 한국농어촌공사에서 관리하는 11개 농업용 저수지에 대한 취수현황 및 제원, 국가지하수센터의 유역내 지하수사용량, 하폐수처리량을 기본 입력 자료로 사용하였다. 특히 농업용 저수지의 경우에는 저수지출구점을 기준으로 저수지 상류유역 및 한국농어촌공사에서 기 구축된 관개면적 공간자료를 기본으로 수혜구역을 세분화하여 모형을 적용하였다.

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