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2025 Vol.58, Issue 2 Preview Page

Research Article

Development and application of riverine suspended sediment concentration measurement technique using H-ADCP considering hysteresis

이력현상을 고려한 H-ADCP 기반 하천 부유사 농도 측정 기법 개발 및 적용

Geunsoo Sona
,
Dongsu Kimb*
,
Youngsin Rohc
손 근수a
,
김 동수b*
,
노 영신c
aResearcher, Research and Development Department, Korea Institude of Hydrological Survey, Goyang, Korea
bProfessor, Department of Civil & Environmental Engineering, Dankook University, Yongin, Korea
cPrincipal Researcher, Research and Development Department, Korea Institude of Hydrological Survey, Goyang, Korea
a한국수자원조사기술원 연구개발실 전임연구원
b단국대학교 토목환경공학과 교수
c한국수자원조사기술원 연구개발실 연구위원
*Corresponding Author
28 February 2025. pp. 141-154
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Abstract

Sediment load data is crucial for the effective maintenance and management of rivers, as well as for sustainable water resource management, requiring consistent and precise measurements. However, current methods for measuring sediment load, such as using suspended sediment samplers, are not only hazardous but also expensive and labor-intensive, making continuous monitoring challenging. This highlights the need for alternative technologies. In this study, we developed a method to measure suspended sediment concentration using the acoustic backscatter from an H-ADCP (Horizontal Acoustic Doppler Current Profiler), aiming to enable continuous sediment load monitoring. The study was conducted at the automatic discharge observation station located at Nampyeong Bridge in Naju City, along Jiseok Creek. A relationship between acoustic backscatter and suspended sediment concentration was established, accounting for the hysteresis effect observed during flood events. The analysis demonstrated that the proposed method improved accuracy by approximately 17% compared to traditional linear regression methods. Additionally, the H-ADCP's accuracy in continuous monitoring reached 87.1% compared to traditional suspended sediment samplers, suggesting its potential to complement the limitations of intermittent measurement techniques. By analyzing the hysteresis effect during flood events, the feasibility of using the H-ADCP for continuous sediment load monitoring was confirmed.

Keywords
H-ADCP
Acousctic backscatter
Suspended sediment concentration
Hysteresis

하천 유사량 자료는 하천의 유지·관리 및 수자원 관리에 필수적인 기초 자료로, 지속적이면서 정확한 측정이 필요하다. 그러나 현재 사용되는 부유사 채취기를 이용한 유사량 측정은 위험하고 많은 비용과 인력이 소요될 뿐만 아니라 연속적인 모니터링이 매우 어렵기 때문에 새로운 대안 기술에 대한 연구가 활발하게 진행되고 있다. 이에 본 연구에서는 H-ADCP (Horizontal Acoustic Doppler Current Profiler)의 초음파산란도를 이용한 부유사 농도 측정에 필요한 분석 기법을 개발하고 이를 실제 하천에 적용하여 이에 대한 적용성을 검토하였다. 본 연구는 지석천의 나주시(남평교) 자동유량관측소를 대상으로 분석을 수행하였으며, 이력현상을 반영한 초음파산란도 부유사 농도 관계식을 개발하여 기존의 단순 선형회귀와 비교하였다. 수위를 고려한 이러한 다중회귀식은 기존 선형 회귀 방법에 비해 약 17%의 정확도가 향상되는 것으로 나타났으며, 기존 부유사 채취기 대비 정확도는 87.1%로 기존 부유사 채취기를 통한 간헐적인 측정 방법을 보완하여 연속적인 부유사 농도 모니터링이 가능함을 확인할 수 있었다. 이를 통해서 홍수 사상에서 발생하는 이력현상에 대한 분석을 통해서 H-ADCP를 이용한 연속적인 유사량 측정의 실용성을 확인하였다.

키워드
횡방향 초음파도플러유속계
초음파산란도
부유사 농도
이력현상
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Information
  • Publisher :KOREA WATER RESOURECES ASSOCIATION
  • Publisher(Ko) :한국수자원학회
  • Journal Title :Journal of Korea Water Resources Association
  • Journal Title(Ko) :한국수자원학회 논문집
  • Volume : 58
  • No :2
  • Pages :141-154
  • Received Date : 2024-09-11
  • Revised Date : 2024-12-24
  • Accepted Date : 2024-12-30
  • DOI :https://doi.org/10.3741/JKWRA.2025.58.2.141
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