• 제목/요약/키워드: 암설사면지형

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한반도 서남부 암설사면지형의 분포가능성 예측 및 검증 (Prediction and Verification of Distribution Potential of the Debris Landforms in the Southwest Region of the Korean Peninsula)

  • 이성호;장동호
    • 한국지형학회지
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    • 제27권2호
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    • pp.1-17
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    • 2020
  • This study evaluated a debris landform distribution potential area map in the southwest region of the Korean peninsula. A GIS spatial integration technique and logistic regression method were used to produce a distribution potential area map. Seven topographic and environmental factors were considered for analysis and 28 different data set were combined and used to get most effective results. Moreover, in an accuracy assessment, the extracted results of the Distribution Potential area were evaluated by conducting a cross-validation module. Block stream showed the highest accuracy in the combination No. 6, and that DEM (digital elevation model) and TWI (topographic wetness index) have relatively high influences on the production of the Block stream Distribution Potential area map. Talus showed the highest accuracy in the combination No. 13. We also found that slope, TWI and geology have relatively high influences on the production of the Talus Distribution Potential area map. In addition, fieldwork confirmed the accuracy of the input data that were used in this study, and the slope and geology were also similar. It was also determined that these input data were relatively accurate. In the case of angularity, the block stream was composed of sub-rounded and sub-angular systems and Talus showed differences according to the terrain formation. Although the results of the rebound strain measurement using a Schmidt's hammer did not shown any difference in topographic conditions, it is determined that the rebound strain results reflected the underlying geological setting.

태백산맥 남부산지의 암설사면지형 (The Study on the Debris Slope Landform in the Southern Taebaek Mountains)

  • 전영귄
    • 대한지리학회지
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    • 제28권2호
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    • pp.77-98
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    • 1993
  • 본 연구는 암설사면지형이 잘 발달하고 다양하게 분포하는 태백산맥의 남부산지를 대상으로 항공 사진판독과 도상계측 및 현지조사를 통하여 노출암설사면의 분포, 형태 및 퇴적물의 특성을 분석하고 사면의 지형적 배열과 지형발달에 관해서 연구한 논문으로써 분포적 특성에 있어서는 애추의 경우 기반암이 경암이거나 절리가 잘 발달된 지질에서, 암괴류의 경우는 화강섬록암 지질에서 높은 분포밀도를 보였다. 형태적 특성은 애추, 암괴류 모두 설상이 각각 83${\%}$, 80${\%}로 가장 많았으며 지형면의 경사도에 있어서는 애추가, 길이에 있어서는 암괴류가 각각 우세했다. 퇴적물의 특성중 암설의 평균입경은 암괴류가 보다 크게 나타났다. 한 지형면에서 암설의 장축방향성의 경우 방향성 있는 경우와 없는 경우가 있는데, 후자는 지형면상의 함몰로 그 방향성이 상실된 것으로 보인다. 끝으로 지형발달의 경우, 애추는 암석낙하(rock fall)에 의한 형성기(최종빙기)와 2차적인 영역에 의한 조정기(후빙기)로 암괴류는 암괴의 생성기(제3가 또는 제 4기의 간빙기), 암괴류의 형성기(최종빙기), 조정기(후빙기)로 구분할 수 있었다. 그리고 산지 사면의 배열유형은 6가지 유형으로 분류되었다.

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공간통합 모델을 적용한 암괴류 및 애추 지형 분포가능지 추출 (Extraction of Potential Area for Block Stream and Talus Using Spatial Integration Model)

  • 이성호;장동호
    • 한국지형학회지
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    • 제26권2호
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    • pp.1-14
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    • 2019
  • This study analyzed the relativity between block stream and talus distributions by employing a likelihood ratio approach. Possible distribution sites for each debris slope landform were extracted by applying a spatial integration model, in which we combined fuzzy set model, Bayesian predictive model, and logistic regression model. Moreover, to verify model performance, a success rate curve was prepared by cross-validation. The results showed that elevation, slope, curvature, topographic wetness index, geology, soil drainage, and soil depth were closely related to the debris slope landform sites. In addition, all spatial integration models displayed an accuracy of over 90%. The accuracy of the distribution potential area map of the block stream was highest in the logistic regression model (93.79%). Eventually, the accuracy of the distribution potential area map of the talus was also highest in the logistic regression model (97.02%). We expect that the present results will provide essential data and propose methodologies to improve the performance of efficient and systematic micro-landform studies. Moreover, our research will potentially help to enhance field research and topographic resource management.

퍼지집합과 베이지안 확률 기법을 이용한 암설사면지형 분포지역 추출에 관한 연구 (The Study on the Extraction of the Distribution Potential Area of Debris Landform Using Fuzzy Set and Bayesian Predictive Discriminate Model)

  • 위눈솔;장동호
    • 한국지형학회지
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    • 제24권3호
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    • pp.105-118
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    • 2017
  • The debris slope landforms which are existent in Korean mountains is generally on the steep slopes and mostly covered by vegetation, it is difficult to investigate the landform. Therefore a scientific method is required to come up with an effective field investigation plan. For this purpose, the use of Remote Sensing and GIS technologies for a spatial analysis is essential. This study has extracted the potential area of debrisslope landform formation using Fuzzy set and Bayesian Predictive Discriminate Model as mathematical data integration methods. The first step was to obtain information about debris locations and their related factors. This information was verified through field investigation and then used to build a database. In the second step, the map that zoning the study area based on the degree of debris formation possibility was generated using two modeling methods, and then cross validation technique was applied. In order to quantitatively analyze the accuracy of two modeling methods, the calculated potential rate of debrisformation within the study area was evaluated by plotting SRC(Success Rate Curve) and calculating AUC(Area Under the Curve). As a result, the prediction accuracy of Fuzzy set model wes 83.1% and Bayesian Predictive Discriminate Model wes 84.9%. It showed that two models are accurate and reliable and can contribute to efficient field investigation and debris landform management.