• 한국농공학회논문집
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• 제52권3호
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• pp.47-55
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• 2010

Investigations on the inundation damage and improvement measures were carried out centering around the protected horticultural complex concentrated in lowlands on the side of Geum river, in Nonsan and Buyeo, Chungnam. Most greenhouses were single-span plastic houses in this area, and tomato, strawberry and watermelon were cultivated mainly. 45.8 % of whole farmhouse were experienced in damage by inundation, and a frequency of the damage was average once in 11 years. The most urgent problem at the greenhouse culture in this area was showed in order of drainage improvement, irrigation water resources and energy saving. Consideration items in drainage improvement project for protected horticulture were showed in order of extending drain pumps, extending drain canals, using concrete flume in drain ditch. It needs to consider systematic plans that can restrain new establishment of greenhouses on the lowland paddy field in drainage area. It is difficult to remove greenhouses which are already established or prohibit cultivation. Therefore we should impose minimum duty items so that greenhouse tillers can cope with inundation. And it is thought that managing agency need to minimize farmers damage by improving drainage ability and introducing maintenance pattern that is different from rice cropping.

• 한국환경과학회지
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• 제25권2호
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• pp.259-265
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• 2016

We analyzed diurnal variations in the surface air temperature using the high density urban climate observation network of Daegu in summer, 2013. We compared the time elements, which are characterized by the diurnal variation of surface air temperature. The warming and cooling rates in rural areas are faster than in urban areas. It is mainly due to the difference of surface heat capacity. In addition, local wind circulation also affects the discrepancy of thermal spatiotemporal distribution in Daegu. Namely, the valley and mountain breezes affect diurnal variation of horizontal distribution of air temperature. During daytimes, the air(valley breeze) flows up from urban located at lowlands to higher altitudes of rural areas. The temperature of valley breeze rises gradually as it flows from lowland to upland. Hence the difference of air temperature decreases between urban and rural areas. At nighttime, the mountains cool more rapidly than do low-lying areas, so the air(mountain breeze) becomes denser and sinks toward the valleys(lowlands). As the result, the air temperature becomes lower in rural areas than in urban areas.

• 기술사
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• 제35권4호
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• pp.48-51
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• 2002

Due to locally torrential downpours which shows Increasing trend, high tide of the southern sea of Korea and etc. submerged and Inundated districts at the lowlands of Nakdong River Basins has been Increasing year by year In order to protect flood hit, it is necessary to make an early implementation of flood control dam and other flood protection works according to Nakdong River Comprehensive Development Project. In addition to the large scale comprehensive projects, local key measures, such as lowland development control, embankment reinforcement, leakage protection, maintenance and management of facilities, increase in pumping station, will be highly effective.

• 한국토양비료학회지
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• 제11권3호
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• pp.175-194
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• 1979

The soil organic matter contents in arable land are generally low in Korea. Thus it is generally agreed that the application of organic materials to soils would be much beneficial. Present paper is a review on the effectiveness of organic mat ter application in uplands and lowlands. 1. The effect of organic matter application in uplands are of more clear and simple to explain as compared to that in lowlands. In uplands, appropriate application of organic matters such as compost and various crops residues improves the physical properties of soils leasing to increased water holding capacity, better aeration, and decrease in soil erosion. 2. In lowland, rice soils under water logged conditions the effect of organic matter application on rice yield is not straight borward and demands more refined knowledges for the interpretation of it. 3. It is found that the application of compost in rice soils is more effective when nitrogen fertilizer application is limited it dicating that nitrogen contained in the organic maerials can become available to rice plant and plays an important role for increased yield of rice under the condition where nitrogen fertilizer supply is limited. 4. Application of organic matter does not always bring about the desirable effects. Very often the organic matter application results in more intensive soil reduction leading to the accumulation of harmful substances which would can cancel out the positive effects of organic matter. This is partiunlarly true in poorly drained soils. 5. Rice straw or compost, when applied rice soils, supply sizeable amounts of available silicate to rice plant resulting in yield increase. 6. Although the effectiveness of organic matter application on rice yield in short term experiments is not consistent due to many reasons, the long term effect of organic matter is significant. 7. The term of the $O.M/SiO_2$ ratio in rice soils can serve as a criterion for the judgement of whether organic matter or silicate fertilizer is needed to be applied in a certain soil.

• 한국식물병리학회지
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• 제14권4호
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• pp.294-298
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• 1998

Since 1995, boxthorn bight caused by Phytophthora spp. has occurred at Chongyang areas in Chungnam province. Infected plants showed yellows and wilt at early stage, but the symptom rapidly progressed into blight due to the decay of roots and basal stem tissues. The disease was relatively severe in poorly drained lowlands and incidence reached ca. 20% in some fields. Two species of Phytophthora were constantly isolated from freshly infected roots and asal stems. Among 39 isolates collected, 26 were identified as P. nicotianae and 13 as P. drechsleri based on their mycological characteristics. Both fungi showed strong pathogenicity to boxthorn cv. Chongyang No. 1. However, the former expressed stronger pathogenicity than the latter. Phytophthora blight of boxthorn caused by the fungi has not been reported n Korea previously.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2006년도 춘계학술대회 논문집
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• pp.426-431
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• 2006

The case where a drain cannot flow backwards, a sewer institution can be unmanageable in this, and a mad is under water momentarily by local heavy nin by the climate phenomenon in spite of not being a lowlands belt has occurred well more than recently. By the flooded mea since it is in the state which has some human bodies at hand, when a short circuit occurs in street lighting pole which is the electric institution thing of a road, the danger of an electric shock accident becomes higher. In this paper, it was going to show improvement plan for grasping the brittle factor of street lighting pole electricity facilities through the on-site survey of street lighting pole electricity facilities, and improving this.

• 한국응용곤충학회지
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• 제52권4호
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• pp.273-281
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• 2013

지구온난화로 인해 고산지역에 고립되어 서식하는 고산종은 감소할 가능성이 높다. 본 연구는 한라산 고지대에 서식하는 10종의 유존 나비종의 서식실태를 파악하기 위해 수행되었다. 고지대의 나비조사는 한라산 정상부의 초지에서 2007년부터 6년간 실시하였다. 유존종의 나비가 저지대에 나타나는 지 확인하기 위해 2012년에는 저지대의 2곳에서 조사를 하였다. 나비는 선조사법으로 조사하였다. 10종의 유존 나비종들은 고지대에서는 관찰이 되었으나, 저지대에서는 관찰되지 않았다. 이들 종들은 대부분 개체수가 많고 개체군의 안정성이 다른 나비들에 비해 낮지 않았다. 밀도 변화를 분석한 결과 유존종의 나비들이 감소하거나 증가하는 경향은 나타나지 않았다. 따라서 기후변화의 영향은 아직은 유존 나비종의 개체군에 명확하게 나타나지는 않았다. 본 조사결과와 우리나라의 출현자료를 토대로 각 유존종에 대한 취약성 평가를 하였다.

• 한국수자원학회논문집
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• 제50권5호
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• pp.315-324
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• 2017

2014년 8월 25일 집중호우시 효암천 상류지역의 도심과 농경지 등에 큰 침수피해가 발생하였다. 이 지역은 고리원전 부지조성을 위해 하구부의 하천이설과 주변지역에 대한 성토 등 대규모 개발사업이 이루어진 곳이다. 본 연구에서는 이러한 개발이 홍수시 침수피해의 원인이 되었는지를 알아보기 위해 HEC-GeoRAS 모형을 이용하여 개발사업 전 후에 대한 효암천 유역의 침수심과 침수면적의 변화를 조사하였다. 분석결과, HEC-GeoRAS 모형은 농경지 등 지형변화 및 표고차가 작은 하천유역에 대해서도 홍수시 침수심과 침수면적의 변화를 비교적 정확하게 산정할 수 있는 것으로 확인되었다. 침수심은 개발사업의 영향으로 2014년 8월 집중호우시 0.99 m가 상승하였고, 100년빈도 홍수시에는 0.39 m가 상승하는 것으로 나타났다. 침수면적은 100년빈도 훙수시 침수심 1.5 m 이하에서는 감소하였으나 침수심 4.5 m 이상에서는 오히려 증가하는 것으로 나타났다. 결론적으로, 하천이설과 개발사업으로 인해 하구부의 농경지와 저지대의 자연저유기능이 상실된 것이 2014년 8월 집중호우시 홍수발생의 주된 원인이 되었으며, 하천이설에 따라 신설된 하천단면의 총 하폭은 크게 증가하였으나 실질적인 유효하폭은 오히려 축소되어 통수단면적이 감소되었던 것이 침수피해를 가중시킨 것으로 나타났다. 추후 하천이설이나 주변지역에 대한 성토 등 개발행위시에는 기존의 저유기능이 충분히 고려된 하천개수계획이 필요한 것으로 판단된다.

• 한국지리정보학회지
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• 제16권3호
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• pp.54-67
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• 2013

본 연구는 근대 대구시를 대상으로 가시권분석과 토지이용현황을 분석하고 GIS를 활용하여 이를 중첩시킴과 동시에 3D 시뮬레이션으로 투시도를 작성하여 근대 대구시의 조망경관 특성을 분석하였다. 근대 대구시의 경관특성은, 가시권역에 포함된 토지이용에서 산림의 비율이 매우 높다는 점이다. 특히, 서쪽의 와룡산, 북쪽의 함지산 및 학봉, 남쪽의 앞산 등 높은 산지와 더불어 서부침식저지와 동부구릉지 및 침식저지에 형성된 산림이 낮은 구릉지 형태로 존재하고 있어서 어디에서나 산림이 조망 가능하며, 시점 주변에 농지가 분포하고 있어서 시점에서 주위 산을 조망할 때, 시야 확보가 가능하고 농지-산림으로 이어지는 자연환경 요소에 의해 연속적인 조망경관이 형성되었다. 또한, 주요 조망대상은 조사구역의 경계를 형성하고 있는 산지이며, 성내에서 경계를 형성하고 있는 산지까지의 내부공간에는 주변지역보다 표고가 높고 산림으로 구성된 조망대상이 위치하고 있어서 성내를 중심으로 서쪽, 남쪽, 북쪽 방향으로 이중구조를 지니고 있으며, 이로 인하여 중첩경관(重疊景觀)이 형성되어 있다.

• 한국조경학회지
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• 제34권2호
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• pp.36-43
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• 2006

This study was carried out to determine the ways in which drying improves and develops dredged soils which exist widely in the lowlands of Korea. Before drying there were large variations in the fundamental physico-chemical properties of dredged soils collected from different places. In the sample soils, saturated hydraulic conductivity decreased gradually with an increase in bulk density with the exception that in air-dried soils a reverse trend was observed. Also in the sample soils, the sedimentation volume and the consistency limits decreased gradually with the decrease in soil water content after the air-drying treatment. The porosity of the sample soils decreased from $0.67{\sim}0.87m^3/m^3\;to\;0.58{\sim}0.66m^3/m^3$ and the liquid-phase range decreased from $0.41{\sim}0.83m^3/m^3\;to\;0.29{\sim}0.71m^3/m^3$. The solid-phase range of sample soils increased $0.13{\sim}0.33m^3/m^3\;to\;0.24{\sim}0.37m^3/m^3$ same as above with air-drying treatment. In conclusion the air-drying treatment caused an irreversible effect on some physical properties. Accordingly, these facts indicate that the effects of air-drying treatment on these properties are considered to be resulted from irreversible changes in the structural status of the sample soils.