• 한국지형학회지
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• 제18권4호
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• pp.17-33
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• 2011

본 연구는 우리나라의 하안단구 연구사를 요약·정리하고, 선행 연구를 토대로 우리나라 하안단구의 지형 특성을 검토하였다. 우리나라의 하안단구 연구사는 3시기로 구분할 수 있다. 일제강점기~1980년대 중반은 초창기 지형학자들에 의해 하안단구 이론이 전파되었던 시기이다. 1980년대 후반~1990년대는 하안단구에 대한 박사학위 논문이 집중적으로 배출되어 하안단구에 대한 논의가 우리나라 지형학의 중심에 자리 잡은 시기이다. 2000년대 이후에는 다양한 연구방법이 개발되면서 하안단구에 대한 논의가 한층 성숙되고 연구 성과가 양적으로 풍부해진 시기이다. 우리나라에서 하안단구가 가장 잘 발달한 지역은 태백산맥 일대의 한강 중·상류 및 낙동강 중·상류의 영서 및 영동 하천과 소백산맥의 서사면에 해당하는 남한강 중류, 금강 중·상류, 섬진강 중·상류이다. 지반융기가 활발한 이들 하천에서는 하상비고가 매우 높은 하안단구가 관찰되고, 하천의 하각률이 상대적으로 높다. 그리고 하안단구 형성시기는 신생대 제4기의 기후 변동에 의해서 규칙적으로 나타나는 것이 아니라, 해당 하천 유역의 기후, 수문, 지질, 지형 등의 환경 조건에 따라 매우 복잡한 양상을 띠는 것으로 판단된다.

• Journal of Ecology and Environment
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• 제43권2호
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• pp.191-201
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• 2019

Macroecologists and biogeographers continue to predict the distribution of species across space based on the relationship between biotic processes and environmental variables. This approach uses data related to, for example, species abundance or presence/absence, climate, geomorphology, and soils. Researchers have acknowledged in their statistical analyses the importance of accounting for the effects of spatial autocorrelation (SAC), which indicates a degree of dependence between pairs of nearby observations. It has been agreed that residual spatial autocorrelation (rSAC) can have a substantial impact on modeling processes and inferences. However, more attention should be paid to the sources of rSAC and the degree to which rSAC becomes problematic. Here, we review previous studies to identify diverse factors that potentially induce the presence of rSAC in macroecological and biogeographical models. Furthermore, an emphasis is put on the quantification of rSAC by seeking to unveil the magnitude to which the presence of SAC in model residuals becomes detrimental to the modeling process. It turned out that five categories of factors can drive the presence of SAC in model residuals: ecological data and processes, scale and distance, missing variables, sampling design, and assumptions and methodological approaches. Additionally, we noted that more explicit and elaborated discussion of rSAC should be presented in species distribution modeling. Future investigations involving the quantification of rSAC are recommended in order to understand when rSAC can have an adverse effect on the modeling process.

• Asian Journal of Atmospheric Environment
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• 제10권1호
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• pp.42-50
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• 2016

This study presents a performance evaluation of four different land surface models (LSM) available in Weather Forecast Research (WRF). The research site was located in Haean Basin in South Korea. The basin is very unique by its geomorphology and topography. For a better representation of the complex terrain in the mesoscale model were used a high resolution topography data with a spatial resolution of 30 meters. Additionally, land-use layer was corrected by ground mapping data-sets. The observation equipments used in the study were an ultrasonic anemometer with a gas analyzer, an automatic weather station and a tethered balloon sonde. The model simulation covers a four-day period during autumn. The result shows significant impact of LSM on meteorological simulation. The best agreement between observation and simulation was found in the case of WRF with Noah LSM (WRF-Noah). The WRF with Rapid Update Cycle LSM (WRF-RUC) has a very good agreement with temperature profiles due to successfully predicted fog which appeared during measurements and affected the radiation budget at the basin floor. The WRF with Pleim and Xiu LSM (WRF-PX) and WRF with Thermal Diffusion LSM (WRF-TD) performed insufficiently for simulation of heat fluxes. Both overestimated the sensible and underestimated the latent heat fluxes during the daytime.

• 물과 미래
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• 제15권1호
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• pp.33-42
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• 1982

하천부지의 이용, 개간사업 및 하천을 공학적 측면에서 지속관리해야 된다는 이론이 활발해 짐에 따라 하천형태학의 연구가 주목을 받게 되었다. 그 가운데서도 하천의 사행에 관한 문제는 가장 중요함을 인정받았다. 그러므로 사행특성의 분석에서 많은 이상적인 모델을 사용하였는데 이와 같은 이상적이 모델에 의해 얻어진 자료나 기하학적 변수의 결정방법은 개인의 선호에 의해 달라지는 수가 많다. 본 연구에서는 수로형태의 모델화에 의한 부합리를 제거하기 위하여 통계적인 방법을 사용하였으며 새로운 사행특성 분석방법인 선형 일반화 알고리즘에 의한 수로모델을 사행특성 분석에 사용하였다. 그 결과 곡율의 분산정도가 사행밀도를 판별해주는 지수가 됨을 알았고, 첨연도는 임의수로 내에서 직선수로의 특성을 표시하는 척도가 됨을 알 수 있었다. 특히 선형 일반화 알고리즘에 의한 수로모델은 사행특성을 분석하는데 좋은 모델이 됨을 나타내 주었다.

• 한국석유지질학회지
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• 제12권1호
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• pp.9-13
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• 2006

화산분출물 중에서 균질한 화학조성을 가지는 화산유리는 제4기 지형 발달순서 및 지층연대에 많이 사용된다. 비정질 화산유리는 실험실에서 세척, 분리, 감정의 과정을 걸쳐 시료로부터 분리되어 분석된다. 그러나 일련의 과정들 속에서 오류가 발생할 수 있고, 오류로부터 층서대비 및 연대측정에 오차를 발생시킬 수 있으므로 화산유리 연구의 오차 범위를 줄이기 위해, 간단하며 정확한 화산유리 세척, 분리, 감정과정의 이해가 필요하다. 여기에서는 테프라를 통한 정확한 실험을 하기 위해 필요한 올바른 절차에 대해 제안을 해본다.

• 수산해양교육연구
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• 제19권3호
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• pp.355-365
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• 2007

This study examined the essential elements of urban fishing ports in the region of Busan in terms of the hydrography, geomorphology, and urban functions of each fishing port and then estimated their development potential. The results were as follows: (1) The ports in the eastern and central parts of the Busan region, used mostly for fishing, were open or quasi-open type ports with ${\Omega}>0.8$, while those of the western part tended to show the reverse. (2) Of the 51 fishing ports, 37.3% were located on land inside the coastline, and structures such as breakwaters had been constructed on both sides of the entrance. Of the total, 47.1% were small fishing ports with water depths of 0~1 m. (3) In the Busan region, 39.2% were urban fishing ports, including Daebyeon and Dadaepo, and 60.8% were non-urban fishing ports.

• 한국지구물리탐사학회:학술대회논문집
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• 한국지구물리탐사학회 2005년도 공동학술대회 논문집
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• pp.139-144
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• 2005

남극 웨델해 북부에 위치한 남스코시아해령을 가로지르는 측선에 대하여 다중채널 탄성파 탐사를 수행하였다. 남스코시아해령은 남극반도의 연장선에 존재하는 대륙지각으로 각각 해양지각인 스코시아해와 포웰분지와 접하고 있다. 남스코시아해령은 스코시아 판의 남쪽 가장자리를 이루고 있는 동-서 방향의 좌선 변환단층을 따라 횡장력에 의해 만들어졌다. 남스코시아해령 중앙에 위치한 중앙 함몰대는 경사부정합이 존재하며 남스코시아해령의 확장과정에 나타난 구조로 해석된다.

• Water Engineering Research
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• 제3권4호
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• pp.259-267
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• 2002

South Africa has developed a policy and law that calls and provides for the equitable and sustainable use of water resources. Sustainable resource use is dependent on effective resource protection. Rivers are the most important freshwater resources in the country, and there is a focus on developing and applying methods to quantify what rivers need in terms of flow and water quality. These quantified and descriptive objectives are then related to specified levels of ecological health in a classification system. This paper provides an overview of an integrated and systematic methodology, where, fer each river, and each river reach, the natural condition and the present ecological condition are described, and a level/class of ecosystem health is selected. The class will define long term management goals. This procedure requires each ecosystem component to be quantified, starting with the abiotic template. A modified flow regime is modelled for each ecosystem health class, and the resultant fluvial geomorphology and hydraulic habitats are described. Then the water chemistry is described, and the water quality changes that are likely to occur as a consequence of altered flows are predicted. Finally, the responses to the stress imposed on the biota (fish, invertebrates and vegetation) by modified flow and water quality are predicted. All of the predicted responses are translated into descriptive and/or quantitative management objectives. The paper concludes with the recognition of active method development, and the enormous challenge of applying the methods, implementing the law, and achieving river protection and sustainable resource-use.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2008년도 춘계 학술발표회 초청강연 및 논문집
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• pp.1378-1385
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• 2008

The probability of landslide hazards was predicted to natural terrain around the stone relics of Jinjeon-saji area, which is located in Yangyang, Kangwon Province. As the analysis results of field investigation, laboratory test and geology and geomorphology data, the effect factors of landslides occurrence were evaluated, and then the landslides prediction map was made up by use of prediction model considering the effect factors. The susceptibility of stone relics induced by landslides was investigated as the grading classification of occurrence probability using the landslides prediction map. In the landslides prediction map, the high probability area of landslides over 70% of occurrence probability was 3,489m3, which was 10.1% of total prediction area. If landslides are occurred at the high elevation area, the three stories stone pagoda of Jinjeon-saji (National treasure No.122) and the stone lantern of Jinjeon-saji (Treasure No.439) will be collapsed by debris flow.

• 산업기술연구
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• 제19권
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• pp.155-162
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• 1999

In the last few years the automatic classification of morpholgical landforms using GSIS and DEM was investigated. Particular emphasis has been put on the morphological point attribute approaches and the extraction of drainage basin variables from digital elevation models. The automated derivation of landforms has become a neccessity for quantitative analysis in geomorphology. Furthermore, the application of GSIS technologies has become an important tool for data management and numerical data analysis for purpose of geomorphological mapping. A process developed by Dikau et al, which automates Hanmond's manual process, was applied to the pyoung chang of the kangwon. Although it produced a classification that has good resemblance to the landforms in the area, it had some problems. For example, it produced a progressive zonation when landform changes from plains to mountains, it does not distinguish open valleys from a plains mountain interface, and it was affected by micro relief. Although automating existing quantitative manual processes is an important step in the evolution automation, definition may need to be calibrated since the attributes are oftem measured differently. A new process is presented that partly solves these problems.