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2021 Vol.54, Issue 11 Preview Page

Research Article

Development of flow measurement method using drones in flood season (II) - application of surface velocity doppler radar

드론을 이용한 홍수기 유량측정방법 개발(II) - 전자파표면유속계 적용

Tae Hee Leea*
,
Jong Wan Kangb
,
Ki Sung Leec
,
Sin Jae Leed
이 태희a*
,
강 종완b
,
이 기성c
,
이 신재d
aSenior Researcher, Hydrological Survey Department, Korea Institute of Hydrological Survey, Goyang, Korea
bResearcher, Hydrological Survey Department, Korea Institute of Hydrological Survey, Goyang, Korea
cPh.D. Course, Department of Civil Engineering, Inha University, Incheon, Korea
dPrincipal Researcher, Hydrological Survey Department, Korea Institute of Hydrological Survey, Goyang, Korea
a한국수자원조사기술원 선임연구원
b한국수자원조사기술원 전임연구원
c인하대학교 토목공학과 박사과정
d한국수자원조사기술원 책임연구원
*Corresponding Author
30 November 2021. pp. 903-913
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Abstract

In the flood season, the measurement of the river discharge has many restrictions due to reasons such as budget, manpower, safety, convenience in measurement and so on. In particular, when heavy rain events occur due to typhoons, etc., it is difficult to measure the amount of flood due to the above problems. In order to improve this problem, in this study, a method was developed that can measure the river discharge in a flood season simply and safely in a short time with minimal manpower by combining the functions of a drone and a surface velocity doppler radar. To overcome the mechanical limitations of drones caused by weather issues such as wind and rainfall derived from the measurement of the river discharge using the conventional drone, we developed a drone with P56 grade dustproof and waterproof performance, stable flight capability at a wind speed of up to 36 km/h, and a payload weight of up to 10 kg. Further, to eliminate vibration which is the most important constraint factor in the measurement with a surface velocity doppler radar, a damper plate was developed as a device that combines a drone and a surface velocity Doppler radar. The velocity meter DSVM (Dron and Surface Veloctity Meter using doppler radar) that combines the flight equipment with the velocity meter was produced. The error of ±3.5% occurred as a result of measuring the river discharge using DSVM at the point of Geumsan-gun (Hwangpunggyo) located at Bonghwang stream (the first tributary stream of the Geum River). In addition, when calculating the mean velocity from the measured surface velocity, the measurement was performed using ADCP simultaneously to improve accuracy, and the mean velocity conversion factor (0.92) was calculated by comparing the mean velocity. In this study, the discharge measured by combining a drone and a surface velocity meter was compared with the discharge measured using ADCP and floats, so that the application and utility of DSVM was confirmed.

Keywords
Drone
Surface velocity doppler radar
DSVM
Flood season
Discharge measurement
Surface velocity
Mean velocity conversion coefficient

홍수기 하천에서 유량측정은 예산, 인력, 안전 및 측정 시 편의성 등의 이유로 측정에 제한이 많다. 특히, 태풍 등으로 인한 호우사상 발생 시 위와 같은 문제로 홍수량 측정에 어려움이 따른다. 이러한 문제점을 개선하기 위해 본 연구에서는 드론(Drone)과 전자파표면유속계(Surface velocity doppler radar)의 기능을 조합하여 최소 인력으로 짧은 시간에 간편하고, 안전하게 홍수기에 하천유량을 측정할 수 있는 방법을 개발하였다. 기존 드론을 이용한 유량측정 연구에서 도출된 바람, 강우 등 기상 요인에 의한 드론의 기계적인 한계를 극복하기 위해 본 연구에서는 IP56 등급의 방진·방수 성능, 최대 36 km/h의 풍속에서 안정적인 비행능력과 최대 10 kg을 탑재할 수 있는 드론을 개발하였다. 또한 전자파표면유속계 측정에 있어서 주요 제약 요소인 진동을 제거하기 위해 드론과 전자파표면유속계를 결합하는 댐퍼플레이트를 개발하였다. 이들 비행장비와 유속계를 결합시킨 유속계 DSVM (Dron and Surface Veloctity Meter using doppler radar)을 제작하였으며, 봉황천(금강 제1지류)에 위치한 금산군(황풍교)지점에서 DSVM을 운용하여 홍수량을 측정한 결과 ±3.5%의 오차가 발생하였다. 또한 측정된 표면유속으로부터 평균유속을 산정할 때 정확도 향상을 위해 ADCP를 이용하여 동시 측정하고, 평균유속을 비교하여 평균유속환산계수(0.92)를 산정하였다. 본 연구에서는 드론과 전자파표면유속계를 결합해 측정한 유량과 ADCP 및 봉부자를 이용해 측정한 유량을 비교하고, DSVM의 적용 및 활용 가능성을 확인하였다.

키워드
드론
전자파표면유속계
DSVM
홍수기
유량측정
표면유속
평균유속환산계수
References
1
Detert, M., Johnson, E.D., and Weitbrecht, V. (2017). "Proof-of-concept for low-cost and non-contact synoptic airborne river flow measurements." International Journal of Remote Sensing, Vol. 38, No. 8-10, pp. 2780-2807. 10.1080/01431161.2017.1294782
2
Fujita, I., Notoya, Y., and Shimono, M. (2015). "Development of UAV-based river surface velocity measurement by STIV based on high-accurate image stabilization techniques." E-proceedings of the 36th IAHR World Congress, Hague, Netherlands, p. 28.
3
ISO 748 (2007). Hydrometry-Measurement of liquid flow in open channels using currentmeters or floats, ISO, Switzerland.
4
Johnson, E.D., and Cowen, E.A. (2017). "Remote determination of the velocity index and mean streamwise velocity profiles." Water Resources Research, Vol. 53, No. 9, pp. 7521-7535. 10.1002/2017WR020504
5
K-water (1994). Development of measurement facilities for stream discharge (development of a microwave surface velocity meter and supersonic correlation current meter). WRRIWR-94-1.
6
Lee, H.S., and Lee, H.B. (2015). "A review of drone technologies applicable to water resources engineering fields." Water for Future, Vol. 48, No. 11, pp. 100-107.
7
Lee, S.H., Kim, W.G., and Kim, Y.S. (1997). "Practical aspects of microwave surface velocity meter applied to measurements of stream discharges." Journal of Korea Water Resources Association, Vol. 30, No. 6, pp. 671-678.
8
Lee, T.H., Lim, H., Yun, S.H., and Kang, J.W. (2020). "Development of flow measurement method using drones in flood season (I)-aerial photogrammetry technique." Journal of Korea Water Resources Association, Vol. 53, No. 12, pp. 1049-1057.
9
Ministry of Environment (ME) (2020). Hydrological survey report.
10
Plant, W.J., Keller, W.C., and Hayes, K. (2005). "Measurement of river surface currents with coherent microwave systems." IEEE Transactions on Geoscience and Remote Sensing, Vol. 43, No. 6, pp.1242-1257. 10.1109/TGRS.2005.845641
11
Rantz, S.E. (1982). Measurement and computation of streamflow: Volume 1. Measurement of Stage and Discharge, U.S. Geological Survey, Washington DC.
12
Tukey, J.W. (1977). Exploratory data analysis. Addison-Wesley, CA, U.S.
13
Yamaguchi, T. (1992). Flood discharge observation system using radio current meter. Foundation of River and Basin Integrated Communications, Japan.
14
Yu, K., and Hwang, J.G. (2017). "Measurement of surface velocity in open channels using cameras on a drone." Journal of The Korean Society of Hazard Mitigation, Vol. 17, No. 2, pp. 403-413. 10.9798/KOSHAM.2017.17.2.403
Information
  • Publisher :KOREA WATER RESOURECES ASSOCIATION
  • Publisher(Ko) :한국수자원학회
  • Journal Title :Journal of Korea Water Resources Association
  • Journal Title(Ko) :한국수자원학회 논문집
  • Volume : 54
  • No :11
  • Pages :903-913
  • Received Date : 2021-08-27
  • Revised Date : 2021-09-14
  • Accepted Date : 2021-09-14
  • DOI :https://doi.org/10.3741/JKWRA.2021.54.11.903
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