그래픽 모사기법을 이용한 하천변천의 재현과 예측

• 발행기관: 대한자원환경지질학회
• 저자명: 이영훈
• 간행물 정보: 『자원환경지질』27권 6호, 579~592쪽, 전체 14쪽
• 주제분류: 자연과학 > 지질학
• 파일형태: PDF
• 발행일자: 1994.12.30

영문 초록

A case study is presented where a fluvial system is modeled in three dimensions and compared to data gathered from a study of the Arkansas River. The data is unique in that it documents changes that affected a straight channel that was excavated within the river by the U.S.Army Corps of Engineers. Excavation plan maps and sequential aerial photographs show that the channel underwent massive deposition and channel migration as it returned to a more natural, meandering path. These records illustrate that stability of fluvial system can be disrupted either by catastrophic events such as floods or by subtle events such as the altering of stream s equilibrium base level or sediment load. SEDSIM, stanford s Sedimentary Basin Simulation Model, is modified and used to model the Arkansas River and the geologic processes that changed in response to changing hydraulic and geologic parameters resulting from the excavation of the channel. Geologic parameters such as fluid and sediment discharge, velocity, transport capacity, and sediment load are input into the model. These parameters regulate the frequency distribution and sizes of sediment grains that are eroded, transported and deposited. The experiments compare favorably with field data, recreating similar patterns of fluid flow and sedimentation. Therefore, simulation provide insight for understanding and spatial distribution of sediment bodies in fluvial deposits and the internal sedimentary structure of fluvial reservoir. These techniques of graphic simulation can be contributed to support the development of the new design criteria compatible with natural stream processes, especially drainage problem to minimize environmental disruption.

키워드

모의실험 하천유량 비균질성 이방성 유체흐름방정식 수치해석방법 퇴적물운반방정식