• 대기
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• 제23권3호
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• pp.307-320
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• 2013

We performed comprehensive quality control for eddy-covariance measurements from 3 farmland sites and 1 industrial site adjacent to Nakdong river. The quality control program is based on Foken and Wichura (1996) and Vicker and Mahrt (1997) and we added criteria for trend and standard deviation for scalar variables and modified criteria for non-stationarity condition of Foken and Wichura (1996) to consider random error of fluxes. The classification of data quality is designed for the raw data and the processed flux data, separately. Use of added criteria efficiently reduces the number of outlier for water vapor and $CO_2$ fluxes and use of modified criteria for non-stationarity reduces the number of outlier for scalar fluxes and increases the number of data with accepted quality for further work. Energy balance ratio is higher in farmlands than industrial site, which is due to neglect of heat storage term in industrial site. Among farmland sites, C4 site shows higher energy balance ratio than other sites. This is due to more homogeneous surface of C4 site than other farmland sites. However, energy balance ratio is very low or even negative at night. Mismatch between the flux footprint and the other energy component footprint over the heterogeneous surface is main cause for energy imbalance at night. Other possible causes are also discussed.

• 한국습지학회지
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• 제22권3호
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• pp.217-224
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• 2020

Waterlogging and unintended lake formation become the main problem in some parts of the world. Starting from 1989, the waterlogging problem was observed in the farmland of the Jarso community of Konso Woreda adjacent to the Segen River in Ethiopia. Therefore, the objectives are determining the extent and causes of unintended lake formation using GIS/RS in addition to a preliminary field survey to mitigate the problem. The analysis of satellite images revealed that over the years invasion of the irrigable land by unwanted water had increased, as, in 1989, the size of the wetland area was about 8 Km²; in 2000 the size of the un-intended lake was only 8.23 ㎢. Alarmingly the size of the lake increased to 19.68 Km² in 2014. Silting up of Weir and changing the flow of River Segen and Human Intervention and changing the natural flow of River Yanda were the main causes of this unwanted prolonged water-logging. The ecological and social environment has been degrading as the people of the waterlogged area have been experiencing some settlement and losing their land. Another problem encountered was flooding from River Barka and invasion of the farmland. Sediment control best management practices (BMPs) i.e, Removal of sediment, providing sandbags and well-scheduled maintenance; Changing the junction point of Yanda and Segen River were suggested for the long-term and short term possible remedial measures. Gabion retaining wall on the bank of the Segen River to the face of Barka River was suggested to protect the farmland from flooding.

• 농촌계획
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• 제9권1호
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• pp.65-75
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• 2003

As a pre-step research to make land-use planning in the region level, this study aims to analyze some probability pattern representing transition probabilities from farmland to others using the sequential detailed digital land-use maps. Kinki and Chubu regions of Japan, which have Osaka and Nagoya cities as their center places respectively, were selected as test regions in this study. The 10m grid land-use maps for four time series at every 5 year from 1977 to 1992 were used. In this study, the regions were divided into three sub-areas 10km, 20km, and 30km according to distance from center cities, respectively. The correlation coefficient (CC) between sub-areas with same distance in the two regions was calculated to analyze whether or not the two regions have common points in the pattern of land-use conversion probability from farmland to other types. The probability distribution of the converted areas which were moved to the urbanized area (residential, commercial, industrial, road, park and public facility areas) was about $40{\sim}70%$ for both all periods and sub-areas. According to distance from city centers, the probability moved to the urbanized area was about 60% at 10km area, and 40% at the 30km area, which means that the values we decreased gradually, while in the case moved to the forest and the etc areas, the values were increased slightly. The CC analysis from the paddy field and the dry field to the others separately showed that there is high correlation in the probability pattern between the two regions.

• 한국경제지리학회지
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• 제15권2호
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• pp.192-205
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• 2012

본 연구는 기후변수가 논과 밭이라는 경작유형별로 경지면적과 토지가치에 미친 경제적 효과를 강원도의 농업을 사례로 추정하였다. 기후, 지리 및 토양, 사회 경제적 변수들에 대한 패널자료를 1992-2010년 동안 강원도 11개 시군에 대해 구축하고 리카디언 방법을 사용하였다. 분석결과에 따르면, 기온변수가 논과 밭의 토지가치와 경작면적에 부정적인 영향을 미치고 있다는 것이 밝혀졌다. 이는 지구온난화에서 강수량변수보다는 기온변수가 더욱더 중요하다는 기존의 연구결과를 뒷받침하고 있다. 다른 한편으로, 경작지의 토지가치와 경작면적의 결정요인은 논과 밭의 경작유형에 따라 상이한 것으로 나타났다.

• Spatial Information Research
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• 제9권2호
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• pp.341-352
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• 2001

이 연구는 지리정보시스템(GIS)로 구한 토지생산성지수(FPI)와 노동생산성지수(LPI)를 적용하여 농지의 잠재생산성지수(PPI)를 산정할 수 있는 모형을 개발하였고, 최근 경지정리사업이 완료된 지구에 적용하여 개발된 모형의 적용성을 검토하였다. 토지 생산성지수(FPI)는 분석대상지역의 토양 특성 Poly Grid를 중첩하여 결정하였으며, 노동생산성 지수(LPI)는 직접생산비중 GIS Network 분석으로 구한 통작거리와 논지분포에 따른 노력비 추가분을 전체 직접생산비에 대하 비율로 환산하였다. 마수지구와 원천지구의 개별 농지에 대한 전체생산성지수(PPI)는 각각 0.967∼0.712, 0.986∼0.780으로 비교적 큰 변이를 나타낼 수 있어 농지 평가에 대한 객관적인 자료로 적용할 수 있을 것이다. 농지의 잠재생산성지수를 경지정리 사업의 환지사업, 농민상호간에 농지교환 및 합병사업에 적용함으로써 농지의 규모화 및 집단화을 유도하고 농지생산성을 극대화할 수 있을 것이다.

• 한국지리정보학회지
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• 제14권2호
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• pp.28-39
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• 2011

본 연구는 HyGIS-SWAT 모형을 이용하여 환경부의 대분류/중분류에 따른 유출부하 특성을 평가하고, 토지피복변화에 따른 유출부하 특성을 평가하는 것을 목적으로 하고 있다. 대분류와 중분류 토지피복변화는 두 유역 모두 시가지 지역과 농업지역이 팽창하고 산림지역이 감소하는 것으로 분석되어 현재 지속적으로 도시화가 확대되는 추세를 반영하고 있는 것으로 판단된다. 분류항목특성에 따른 분석결과는 무심천유역의 경우 첨두유출은 상승하였고, 연총유출량은 감소하는 것으로 분석되었다. 구축시기에 따른 특성 분석결과는 갑천유역의 경우 첨두유출은 감소하고, 총유출은 증가하는 것으로 나타났다. 토지피복변화 시나리오는 도시화 확대와 농업지역 확대의 3가지 시나리오를 적용하여 분석하였다. 분석결과 도시화 및 농업지역 확대 시나리오 모두 유출 및 유사농도가 증가하는 것으로 분석되었다.

• 한국환경보건학회지
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• 제35권3호
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• pp.220-225
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• 2009

This study evaluates the water quality of the river near the alpine farmland in the upper Naerin stream, which is a typical stream of the upper Bukhan River with muddy water generation, by the flow examination, it aims to estimate the characteristics of nonpoint sources flowing out from the investigated area and figure out effective methods to reduce them. According to the result of water quality examination, the average BOD of the area not affected by the cultivated land among the areas of the upper Naerin River was 0.47mg/l, and total phosphorous was 0.007mg/l; thus, it maintained the cleanliness level of Ia. The average BOD of the area with the alpine farmland was 0.52mg/l, which was similar to the one of the non-cultivated land. But total phosphorous concentration was 0.023mg/l, which was more than three times higher than the area belonging to level II due to the effect of fertilizer ingredients discharged from the cultivated land. About the loadings of the investigated area generated from each of the pollution sources, BOD was 878.5kg/day and total phosphorous was 79.7kg/day. Moreover, for the load density, BOD was $2.22kg/day.km^2$ and total phosphorous was shown as $0.20kg/day.km^2$. Regarding the rates generated from nonpoint sources like land among the loadings per pollution sources, BOD was 54%, total nitrogen was 91%, and total phosphorous was 73.4%. Therefore, it was shown that most of the nutrients were produced from the nonpoint sources. The level of BOD runoff loading in the Jaun River area, where nonpoint sources were mainly generated, was 37.1kg/day and total phosphorous was 1.33kg/day. The flow rates to the generated amount were estimated as 10.5% and 4.7% each.

• 자원환경지질
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• 제41권4호
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• pp.393-403
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• 2008

이 연구는 우리나라의 농촌지역에서 유기비료로 살포되는 축산 분뇨가 농경지 지하수의 수질과 오염에 미치는 영향을 시공간적 변화를 중심으로 규명하기 위하여 수행되었다. 연구는 경기도의 한 농경지에서 200길 2월, 4월, 6월, 10월에는 관측정을 통한 지하수위 관측과 함께 지하수질 모니터링을 수행하였다. 그 결과 봄-여름-가을로 이어지는 계절과 축분을 뿌리는 시기에 따라서 지하수의 수질과 오염현상의 변화는 축분을 가장 많이 뿌리는 시기인 4월에 질산성 질소 농도가 가장 높게 나타났다. 그리고 지하수 내 Mn, Fe 등의 농도와 용존 유기물함량(DOC) 등을 모니터링 함으로써 천부 지하수의 산화-환원상태와 대수층 내 미생물의 활성도가 연구부지 지하수 내 질산성 질소의 농도변화에 가장 중요한 요인으로 작용하는 것으로 유추할 수 있다.

• 농촌계획
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• 제25권3호
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• pp.37-44
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• 2019

The value of Jeju Batdam has been reexamined as it is listed as a nationally important agricultural heritage and globally important agricultural heritage systems. However, it is already exposed to threats such as reduction of agricultural population and cultivation area. Despite efforts like the agricultural heritage system to preserve traditional agriculture, there is few basic investigation into the current status of Jeju Batdam. The purpose of this study is to estimate the length of Jeju Batdam. We used the continuous cadastral map of Jeju area to extract the boundaries of the field lot. In the cadastral map, the farmland was selected by selecting dry fields, paddy fields and orchards. 300 sample site were selected from the extracted farmland, and the boundaries between the Internet map and the parcels were superimposed and the differences were confirmed on the drawing. After that, field survey was conducted to confirm the boundary of the parcels and the existence of actual Batdam. It is estimated that the length estimated from this study is at least 23,983km and maximum 142,353km, which is at least 1,830km longer than 22,108km announced in 2007. Since Jeju Batdam is based on land parcel boundary, it is an objective and efficient method to utilize intellectual information. In addition, because it is subordinate to farmland, new information can be extracted reflecting the change of land use and make the spatial database based on the cadastral maps.

• 한국지반공학회논문집
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• 제26권7호
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• pp.59-70
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• 2010

대상지역 내 중금속 오염농경지 복원을 위해 설계된 안정화 공법에 대한 현장 적용성을 검토하기 위해 현장실증시험을 수행하였다. 대상오염 농경지에 처리구들을 설치하여 오염토양만을 채운 무처리구를 제외한 각 처리구에 중금속 안정화 재료로 선정된 석회석과 산업부산물인 제강슬래그를 각각의 혼합비로 채운 후, 관측기간동안 처리구 내 토양을 채취하여 이화학특성, 중금속농도(Cu, Cd, Pb, Zn, As) 그리고 중금속 분획특성 등을 분석하여 그 특성을 비교하였으며, 그 결과를 수록하였다.