• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 1998년도 공동 심포지엄 및 추계학술발표회
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• pp.206-215
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• 1998

Using of geosynthetics with linear materials(sand, gravel, clay soil) is rapidly increased in landfill. With geosynthetics, geotextiles often expose to solar radiation(Ultraviolet) on long terms during the installation. In this paper, the results will represent the strength retention rate and tensile retention rate of geotextiles between outdoor exposed and protected by 15cm thickness of soil. As a result of cumulating solar radiation in geotextiles was increased, the strength retentions rate of P.P(500g/$m^2$), P.P(700g/$m^2$) and P.P(1000g/$m^2$) were decreased and the lower weight of unit area of geotextiles, the faster decrease of strength retention rate. P.E.T(600g/$m^2$) was showed a distinctive trend that the strength retention rate increased. The tensile retention rate of tested geotextiles was decreased during the simulation. However, the strength and tensile retention rate of geotextiles covered by soil had changed insignificantly. Therefore, it can surmise that the soil covering will help geotextiles to be protected from UV effecting

• Geomechanics and Engineering
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• 제29권1호
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• pp.91-97
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• 2022

The cohesive non-swelling soil (CNS) cushion technology has been widely applied in the subgrade and slope improvement at expansive soil regions. However, the mechanism of the inhibition effect of the CNS layer on expansive soil (ES) has not been fully understood. We performed four outdoor model tests to further understand the inhibition effect, including different kinds of upper layer and thickness, under the unidirectional seepage condition. The swelling deformation, soil pressure, and electrical resistivity were constantly monitored during the saturation process. It is found that when a CNS layer covered the ES layer, the swelling deformation and electrical resistivity of the ES layer decreased significantly, especially the upper part. The inhibition effect of the CNS layer increases with the increase of CNS thickness. The distribution of vertical and lateral soil pressure also changed with the covering of a CNS layer. The electrical resistivity can be an effective index to describe the swelling deformation of ES layer and analyze the inhibition effect of the CNS layer. Overall, the CNS deadweight and the ion migration are the major factors that inhibit the swelling deformation of expansive soil.

• 한국조경학회지
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• 제26권1호
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• pp.28-35
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• 1998

Six soil compositions with three seeding rates were evaluated for influence on germination, coverage, height and sod development of Phragmites japonica. 1. Germination was high on peat, vermiculite and bark as compared with on peatmoss and sandy loam. 2. Covering rate was high within 2 months when seeded at 9g/$m^2$, but became same within 3 months afterwards when seeded at 3,6 and 9g/$m^2$, respectively. 3. Sod was highly developed on peat and bark treatments whereas Sandy loam, peatmoss and vermiculite treatments didn't develop sod. 4. Sod grown on bark weighed light and, therefore, was suggested best from a dealing cost point of view. 5. Cutting at 10 cm height didn't influence on sod development regardless of soil compositions.

• 한국환경과학회지
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• 제7권4호
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• pp.167-472
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• 1998

The washout on Incision cliff is a serious problem. Incision cliff if not carefully done, can contribute to soil erosion md, by removing covering plants could have a large impact on the temporary of normally the quality of water Because the washout of soil is influenced by its surface, it is necessary to prevent or diminish soul particle by plantation of grass species. Kumerowia stipujacea Is an useful species that diminish the injury of soil and rainwater We study that estimates of preventing soul erosion and river over-flow can be obtained from the experimental model developmented by several equators. Many potential contaminants are removed by filtration as the water moves slowly through the fields of K. supulacea.

• 한국환경복원기술학회지
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• 제6권6호
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• pp.56-71
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• 2003

Waste landfills have been the center of environmental problems and they must be restored due to environmental pollution, disgusting landscape, and cost of management. It is suggested that they be recycled urban space as cities expand. Specially, nonsanitary waste landfills which have no pollution prevention facilities cause serious problems. Restoring the landfills as parks and golf courses, so on makes more benefits because of cheap use land, closeness to urban area, flat topography applicable to parks and golf courses, and high land values after restoration and the changes to local recreation sites. Restoration of waste landfills is a complex, costly, and interdisciplinary work. But, the waste landfill is a manmade ecosystem. Control, restoration and postmanagement of waste landfills are very important problems. The role of vegetation prevents soil erosion, reduces soil water storage, and obstructs leachate seepage. Early restoration makes derelict lands into man park artificially geared to soil, vegetation, landforms and hydrology. But, Ideal restoration is to make stable ecosystem nature-friendly and compatible with surrounding landscape without more management. Landscape is structured hierarchically with patches and stands as small components and forms forest as large components. Therefore, landscape formation of the waste landfills needs much restoration process. There are many ecological restoration techniques for the waste landfills. Those are divided into artificial and natural methods. The artificial method is anthropogenic plantings while the natural method is to trigger and use succession processes. The most important thing in the restoration of waste landfills is to consider the final restoration objectives of each waste landfill. According to these objectives, the depth of covering layer, planting degree, and structural design should be determined. The effective restoration methods should be selected of artificial and natural options.

• 한국환경복원기술학회지
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• 제18권4호
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• pp.1-14
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• 2015

A manipulation of zoysiagrass's lateral stems and soil-media; used for slope revegetation, is expected to facilitate the production of high-quality grass. To study the influences on the growth of zoysiagrass depending upon various soil-media conditions, two different types of soil are used. The results obtained - through investigation of its cover rates, leaf color and number - are summarized as follows. In mountain regions soil, there are no significant differences in growth and development of grass in treatments: zoysiagrass's lateral stems treatments with 1cm, 2cm, and 3cm soil-media and treatment with only seeding. Zoysiagrass, in most of the treatments, show about the same growth rates, and at the end, fair visual quality. Zoysiagrass's lateral stems treatments with 2cm, 3cm show slightly better growth, however, thickness of soil-media need not be more than 1cm to obtain an expected quality of lawn. In decomposed granite soil, there appears statistical significance in growth of the grass in treatments: zoysiagrass's lateral stems treatments with 1cm, 2cm, and 3cm soil-media and treatment with only seeding. The thicker the soil-media, the better the growth of grass, and that in treatment with seeding-only shows poor quality in general. And therefore, it is efficacious to plant in 3cm soil-media when quick formation of lawn is necessary; however, using 2cm soil-media is ultimately the most cost-efficient way of formation. But, when time allows - that is, more than three months - 1cm soil-media in decomposed granite soil is reasonable to formate just as effective lawn. And so when performing seeding, additional covering, fertilization or increasing the quantity of seed must be considered.

• 한국환경복원기술학회지
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• 제10권4호
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• pp.95-108
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• 2007

Test application of revegetation measure was made on the roadside slope damaged by Nongseo-Eomo national road improvement project in a bid to prevent the soil from being washed out as well as to restore the ecological environment, and the survey for assessment of the effect of slope revegetation measures was conducted, beginning May 11 through Nov 7, 2006. In the wake of comprehensive reviewing and evaluating the surrounding topographic environment, physical and chemical characteristics of soil, germination of revegetation plants, analysis of bio mass, covering ratio and the plants appeared, measure b was found to have been most appropriate to cut blasting rock slope, and alternatively measure c. For cut ripping rock slope, measure c-1 appeared to be effective in revegetation effect, and alternatively, b-1.When it comes to cut soil slope, measure c-2 was found to be effective, and b-2 to be a good alternative. And for embankment soil slope, measure b-3 appeared to be most efficient in revegetation effect and measure f as alternative.

• 지질공학
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• 제32권4호
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• pp.483-498
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• 2022

토양수분은 불포화대의 공극 내에 존재하는 물로 정의되며, 다양한 수문학적 과정과 밀접하게 연관되어 있다. 본 연구에서는 지하수에 대한 의존도가 높은 농촌지역인 연구지역을 덮고 있는 6가지의 토지이용에 따른 토양수분 함량 및 토양 투수성 비교를 통해 토양수분에 영향을 미치는 요인을 파악하여 향후 연구에 유용한 자료를 제공하는 것을 목적으로 한다. 시계열 자료를 이용하여 자기상관분석, 스펙트럼 밀도분석 및 교차상관분석을 수행하였다. 토양수분 함량은 약한 자기상관성 및 기억효과를 가지며, 강수량이 토양수분 함량에 상당한 영향을 미치는 것으로 사료된다. 토지이용 변화에 따라 포화 수리전도도는 크게 변화하지 않으며, 대신 불균질한 토양의 구조에 의하여 영향을 받는 것으로 보인다.

• 한국토양비료학회지
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• 제29권3호
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• pp.249-254
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• 1996

잠재성 산성황산여토양의 개량을 위해 표면배수실험, 배수실험, 토양간혼용, 매몰효과를 실험한 결과는 다음과 같다. 1. 잠재 산성황산염토양의 물관리방법에 있어 표면 배수효과는 없었으며, 배수효과는 1일 이상 배수처리구들 보다 1일 간격 배수 처리시 토양 pH가 다소 높게 유지되었으며 벼 생육상태도 양호하였다. 2. 산화된 잠재성 산성황산염토양을 개량하는데 있어 숙답토와의 동비율 혼합구 및 숙답토 30cm 복토구에서는 수도생육피해가 없어 물리적 개량법으로 이용할 수 있었다. 3. 잠재 산성황산염토양을 파낸 후 효과적인 처리방안으로는 숙답토로 30cm이상 복토한 구 및 숙답토 50%이상 혼합토양구에서 수도피해가 없었으므로 숙답에 성토하는 경우 30cm이상 복토처리가 요구된다.

• 생물환경조절학회지
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• 제17권1호
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• pp.1-8
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• 2008

고랭지 경사밭의 토양보전을 위해서 고랭지 배추재배지에 애기기린초, 범의귀, 지면패랭이, 긴병꽃풀 등 4종의 지피성 동반작물의 도입가능성을 경사도 5, 15 및 30%의 라이시미터에서 평가하였다. 애기기린초를 제외한 지피성 동반작물은 배추의 생육에 영향을 미치지 않았다. 배추와 동반작물에 의한 정식 이후의 피복률 변화는 동반작물보다는 배추생장에 의해 주도되었으며, 초기의 생장속도가 빨랐던 긴병꽃풀과 애기기린초 동반작물 재배구에서 초기 피복률 상승이 빠른 반면, 고온기 생장속도가 느린 범의귀와 지면패랭이는 급속한 피복도 증가를 보이지 않았다. 각각의 동반작물의 줄기와 잎의 절단 경도는 범의귀와 애기기린초가 낮은 반면, 긴병꽃풀과 지면패랭이는 매우 높아 내답압성이 우수하였다. 지피성 동반작물과 배추는 광 및 양분 경합성은 거의 없었다. 지피성 동반작물 재배구에서 배추 수관 아래 기온 및 지온은 배추 단독구보다 각각 $1^{\circ}C$내외, $0.5{\sim}1^{\circ}C$ 낮았으며, 습도는 8% 정도 높았다. 4종 지피성 동반작물을 토양보전성, 경관성, 내성, 생육 등을 고려하여 각 평가요소별 가중치를 두어 평가한 결과, 지면패랭이>긴병꽃풀>>범의귀>애기기린초의 순으로 높았고, 이중 지면패랭이가 가장 우수하였다.