[논문]실시간 관측정보를 이용한 이안류 경보체계 개선 연구: 발생정도 DB함수의 활용

최준우

doi:10.3741/jkwra.2022.55.10.843

실시간 관측정보를 이용한 이안류 경보체계 개선 연구: 발생정도 DB함수의 활용
A modification of the rip current warning system utilizing real-time observations: a database function of likelihood distributions 원문보기

Journal of Korea Water Resources Association = 한국수자원학회논문집, v.55 no.10, 2022년, pp.843 - 854

최준우 (한국건설기술연구원 수자원하천연구본부)

초록
AI-Helper

이안류 안전사고 저감을 목적으로 운영되는 실시간 이안류 경보체계에서 위험지수를 생산하는 방법을 개선하는 연구를 수행하였다. 상기 체계는 실시간 관측정보를 기반으로 신속한 이안류 위험지수를 생산할 필요가 있기 때문에 사전 수치모의 결과(즉, 발생가능 시나리오에 따른 이안류 발생정도)를 이용한다. 본 연구에서는 기존 기법의 곡선적합 경험식을 사용하는 대신에, 다변수 함수인 이안류 발생정도를 2차원 분포(예, 파고-주기, 파고-조위, 파고-파향, 파고-주파수 스펙트럼 광협도, 파고-파향 스펙트럼 광협도)로 저장하여 사용하므로 이안류 위험지수 생산 기법을 개선하였다. 2021년에 운영된 해운대 파랑 관측자료와 부산조위소의 조위정보를 개선된 방법에 적용하였고, CCTV를 통해 확인된 몇 차례의 이안류 발생사건에 대하여 관측정보와 적용한 결과를 비교하여 제시하였다.

Abstract ▼ AI-Helper

For the rip current warning system to reduce rip-current accidents, the implementation method producing the risk index was modified. To produce fast response from the warning system based on real-time observations, the method employed the numerical results (i.e., rip current likelihoods according to the possible scenario) obtained in advance. In this study, instead of using the empirical curve-fitting functions of the previous method, the present modification utilized two-dimensional distributions (i.e., wave height and period, wave height and tidal elevation, wave height and direction, wave height and spreading of frequency-directional spectrum) of rip current likelihoods stacked in a database of the system. The wave and tidal observations in 2021 at the Haeundae coast were applied to the modified system, and its performances at several real events recorded in CCTV images were presented.

주제어

표/그림 (14)

그림 Fig. 1. Flow chart and web service page of rip current warning system operated by KHOA (Korea Hydrographic and Oceanographic Agency)
표 Table 1. Scenario of swell and tidal conditions as the input parameters in numerical simulations of regular wave-induced rip currents (The elevation is on the datum level, the angle 0° indicates the wave direction of perpendicular to the shoreline, and the bracket indicates the number of cases varied with each parameter.)
표 Table 2. Scenario of wind wave and tidal conditions as the input parameters for numerical simulations of random wave-induced rip currents (The elevation is on datum level, the angle 0° indicates the wave direction of perpendicular to the shoreline, and the bracket indicates the number of cases varied with each parameter.)
그림 Fig. 2. Time series of the maximum rip currents in the simulations shown in Table 3. The magenta lines indicate the dangerous velocities to calculate the rip current likelihoods
표 Table 3. The rip current likelihoods according to the input parameters for the FUNWAVE simulation results shown in Fig. 2
그림 Fig. 3. The distributions of likelihood of rip current that are database functions of the six parameters
그림 Fig. 4. Snapshot (CCTV images) of rip current events at the Haeundae beach of the 20th of June, 2021. The yellow arrow points to a trace (i.e., ends of breaking wave crests) of the rip current event
그림 Fig. 5. Time series of rip-current likelihood index (first panel) and observations (significant wave period (second panel); significant wave height (third panel); tidal elevation (black line) and wave direction (red line) (fourth panel); spreading of frequency spectrum (blue line) and spreading of directional spectrum (red line) (fifth panel)) of the 20th of June, 2021. In the first panel, the gray line indicates the previous index and the black line indicates the present index. The gray broken lines of 30, 55 and 80 emphasize rip current warning levels. The wide green bands indicate the rip current events in Fig. 4
그림 Fig. 6. Snapshot (CCTV images) of rip current events at the Haeundae beach of the 25th of July, 2021. The yellow arrow points to a trace (i.e., white foams of breakers) of the rip current event
그림 Fig. 7. Same as Fig. 5 on the 25th of July, 2021
그림 Fig. 8. Snapshot (CCTV images) of rip current events at the Haeundae beach of the 27th of July, 2021. The yellow arrow points to a trace (i.e., white foams of breakers, ends of breaking wave crests) of the rip current event
그림 Fig. 9. Same as Fig. 5 on the 27th of July, 2021
그림 Fig. 10. Snapshot (CCTV images) of rip current events at the Haeundae beach of the 22nd of August, 2021. The yellow arrow points to a trace (i.e., white foams of breakers, ends of breaking wave crests) of the rip current event
그림 Fig. 11. Same as Fig. 5 on the 22nd of August, 2021

참고문헌 (36)

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표제어: PCR

동의어: Packet Collision Rate

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