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Applicability Evaluation of Multi Beam Echo Sounder for Inland Water

다중빔 음향측심기의 내수면 적용성 평가

  • Received : 2018.11.26
  • Accepted : 2018.12.26
  • Published : 2018.12.31

Abstract

In this study, the application of the single beam echosounder and multi beam echosounder was analyzed for the Youngsan river, from the Juksanbo to the Juksan bridge, length of 840m, width 230m and area $0.16km^2$. A single beam echosounder and a multi beam echosounder are mounted on an USV (Unmanned Surface Vessel), and each data is acquired. Then, TIN (Triangular Irregular Network) is created and the grid depth of 10m intervals is extracted. The grid depth of the single beam echo sounder and the grid depth of the multi beam echo sounder were overlapped to compare the two data. As a result of analysis using 5,024 data, the mean depth difference was 0.0319m and the standard deviation was 2.4095m. The river bed shape was similar to each other. If the multi-beam echo sounder is regarded as the standard, the volume difference of the stream is $161,882m^3$. With a multi-beam echo sounder installed, the operating distance increased by approximately 55% to 4595.85m, and the operating time increased by approximately 59% to approximately 47%.

본 연구에서는 영산강의 죽산보에서 죽산교까지 길이 약 840m, 폭 약 230m, 넓이 약 $0.16km^2$를 대상으로 단빔 음향측심기와 다중빔 음향측심기의 내수면 적용성을 분석하였다. 무인선에 단빔 음향측심기와 다중빔 음향측심기를 장착하고 각각의 데이터를 획득한 다음 비정규삼각망(TIN: Triangular Irregular Network)을 생성하고 10m 간격의 격자 수심을 추출하였다. 추출한 단빔 및 다중빔 음향측심기의 격자수심 총 5,024개의 데이터를 중첩 비교하여 다음의 결론을 얻을 수 있었다. 첫째, 수심의 차이는 평균 0.0319m로서 전체적으로 큰 차이는 없었으나 표준편차는 2.4095m로 크게 나타났다. 둘째, TIN으로 구현된 하상의 형태는 서로 유사하였으나, 다중빔의 하상면보다 높거나 낮은 단빔의 하상면 구역들의 체적은 총 $161,882m^3$의 차이가 있었다. 셋째, 대상지역 전체를 다중빔으로 스캔했을 때 단빔에 비해 운항 거리는 4,595.85m, 약 55% 정도 증가하였으며, 운항 시간은 59분, 약 47% 정도 증가하였다. 넷째, 작업공정, 투입인원 및 소요비용에서는 같거나 큰 차이가 없었다. 운항 거리나 운항 시간과 같은 작업 효율면에서 단빔을 장착했을 때보다 다중빔을 장착했을 때 효율이 약 0.5배 정도 낮은 것으로 판단되나, 하상변동 예측과 같이 하상면의 정확한 데이터가 필요한 분야에서는 다중빔 음향측심기를 이용한 데이터 획득이 필요한 것으로 판단된다.

Keywords

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Fig. 1. Measuring of water depth using rubber boat(Geosurvey.co.kr)

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Fig. 3. Various types of USV

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Fig. 4. Target area(Rectangle line)

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Fig. 5. Single beam echosounder

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Fig. 6. Multi beam echosounder

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Fig. 7. Leica GPS 1200 system

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Fig. 8. USV used in the experiment

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Fig. 9. Combination of GPS and multi beam transducer

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Fig. 10. Process of experiment

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Fig. 11. Bar check of single beam echosounder

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Fig. 12. Measurement of offset

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Fig. 13. Monitoring of pitch, roll and heading grade

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Fig. 14. Measuring route of USV

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Fig. 15. Depth, SB depth and MB depth

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Fig. 16. Deviation of single beam echosounder and multi beam echosounder (Unit : m)

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Fig. 17. TIN from multi beam echosounder data

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Fig. 18. TIN from single beam echosouder data

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Fig. 19. Surface difference between multi beam echosounder and sing beam echosounder

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Fig. 20. Auto sailing program

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Fig. 2. Measuring of water depth using small vessel(Geosurvey.co.kr)

Table 1 . Measuring route plan and rate

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Table 2 . Measuring interval according to instrument

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Table 3. Specification of CeeStar

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Table 4. Specification of DT-101

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Table 5. Specification of GPS system 1200

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Table 6. Part of interpolated data (Unit : m)

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Table 7. Calculation of volume difference

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Table 8. Comparison of sailing distance

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Table 9. Comparison of work process and worker

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Table 10. Comparison of working time and cost

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Table 11. Worker and cost

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Table 12.

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Acknowledgement

Supported by : 국토교통부

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