Evolution of Bedrock Channel Profile in Homogeneous Landscapes using 2-d Landscape Evolution Model: Uniform Uplift vs Non-uniform Uplift

Dong-Eun Kim

doi:10.22776/kgs.2022.57.2.209

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2022 Vol.57, Issue 2 Preview Page Next Page

Research Article

Evolution of Bedrock Channel Profile in Homogeneous Landscapes using 2-d Landscape Evolution Model: Uniform Uplift vs Non-uniform Uplift 융기율 차이에 따른 하천 종단곡선변화에 대한 이론적 고찰 - 파이썬 기반 2차원 수치지형발달모형을 이용하여 -

30 April 2022. pp. 209-223

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Abstract

A landscape evolution model (LEM) can simulate topography development over time in two dimensions due to computer science and technology development. LEM makes it possible to reflect factors controlling the various surface processes. In this study, four scenarios were designed and simulated to develop longitudinal profiles according to differences in the spatial and temporal distribution of uplift rates using a 2-d LEM. In addition to the longitudinal profiles, geomorphic indices analysis (e.g., the channel steepness index and the log channel slope-log upstream area plot) were used for a more detailed comparison. As a result, the morphological difference of the channel profile and the geomorphic indices showed a significant difference according to the scenario. However, when only the longitudinal profile was used, it was difficult to determine the knickpoint. When analyzing knickpoints related to uplift, topographical factors such as steepness index and log-log plot should also be used for precise detection and definition. Those analysis is expected to be performed when we define a knickpoint related to the uplift.

Keywords

기반암 하상

하천 경사도 지수

2차원 수치지형발달모형

천이점

융기율

시간에 따른 지형의 발달을 모의하는 수치지형발달모형은 과학기술의 발달로 인해 단순하게 1차원에서 분석했던 것에서 벗어나 분석할 수 있게 되었다. 이는 복잡한 실제 지형발달에 영향을 미치는 요인들을 반영할 수 있게 하였다. 본 연구는 2차원 수치지형발달모형을 이용하여 융기율의 공간적, 시간적 분포의 차이에 따른 하천종단곡선의 발달과정에 대해 4 종류의 시나리오를 만들어서 모의하였다. 보다 자세한 비교를 위해 하천종단곡선 뿐만 아니라 경사도 지수, 하천의 경사와 유역면적의 넓이를 이용하였다. 모의한 결과 융기율의 공간적인 분포에 따라 하천종단곡선의 차이가 났으며, 경사도 지수 역시 시나리오에 따라 차이를 보였다. 다만 하천종단곡선만을 이용했을 경우 천이점을 정하는데 어려움이 있었다. 정리하면, 융기로 인해 만들어진 천이점과 관련된 분석을 할 경우 하천종단곡선분석 외에도 경사도 지수와 같은 지형인자들을 이용해야 연구목적에 부합하는 천이점을 찾을 수 있다. 이러한 방법들을 이용하여 융기와 관련된 천이점 분석이 이루어질 수 있을 것으로 기대한다.

키워드

bedrock channel profile

channel steepness index

2-d landscape evolution model

knickpoint

uplift rate

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Information

Publisher :The Korean Geographical Society
Publisher(Ko) :대한지리학회
Journal Title :Journal of the Korean Geographical Society
Journal Title(Ko) :대한지리학회지
Volume : 57
No :2
Pages :209-223
Received Date : 2022-01-26
Revised Date : 2022-04-04
Accepted Date : 2022-04-05
DOI :https://doi.org/10.22776/kgs.2022.57.2.209

Journal of the Korean Geographical Society ISSN:1225-6633(Print) 대한지리학회지

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