Coxs Bazar(Bangladesh)
위경도 (21.4272°N, 92.0058°E) 대원 거리 측지 계산에 기반한 Coxs Bazar 방재 프로필。연안 위험 등급은 「Peripheral Regional Basin」에 해당하며, 해안 지형은 「Bay of Bengal Mega-Delta & Shallow Estuarine Headwaters」, Extremely low delta plain (0.5–2m above sea level) dissected by hundreds of tidal channels.
🛰️ 역대 열대성 저기압 공간 접근 실측 기록
공식 RSMC 및 IBTrACS 베스트 트랙 좌표 기반 대원 구면 거리 측정.
| 사이클론 명칭 | 연도 | 최근접 거리 | 접근 시 등급 | 중심 기압 | 최대 풍속 | 물리적 상호작용 |
|---|---|---|---|---|---|---|
| 🌀Montha(montha-2025) | 2020 | 1201.8 km | tropical storm | 996 hPa | 83 km/h | 🌊 외곽 강수대 및 폭풍해일 |
| 🌀Kalmaegi(kalmaegi-2025) | 2020 | 1318.4 km | tropical depression | 1008 hPa | -- | 🌊 외곽 강수대 및 폭풍해일 |
| 🌀Ditwah(ditwah-2025) | 2020 | 1494.4 km | tropical depression | 1005 hPa | 51 km/h | 🌊 외곽 강수대 및 폭풍해일 |
| 🌀Narra(narra-2026) | 2020 | 1599.6 km | tropical storm | 990 hPa | 83 km/h | 🌊 외곽 강수대 및 폭풍해일 |
| 🌀Maysak(maysak-2026) | 2020 | 1633.3 km | tropical depression | 985 hPa | 90 km/h | 🌊 외곽 강수대 및 폭풍해일 |
물리적 피해 메커니즘 및 인과 증거 체인
실측 관측에서 건축 구조 공학적 영향으로 이어지는 연역적 분석.
01Shallow Bathymetry & Storm Surge Amplification
Grade A (NOAA NCEI IBTrACS / RSMC Real-Time Observation)Historical tracking records verify that cyclone centers have approached within 1201.8 km of the city (e.g., Montha with central pressure of 996.0 hPa and winds of 83.0 km/h).
Bay of Bengal Mega-Delta & Shallow Estuarine Headwaters. Shallower continental shelf in the world + triangular bay geometry driving 6–10m catastrophic storm surges.
The inverse barometer effect (approx. 1 cm sea level rise per 1 hPa pressure drop) combined with intense onshore wind stress pushes massive water masses across shallow continental waters, preventing natural tidal egress.
Coastal flood gates and frontline barrier dikes experience hydrodynamic loading far exceeding normal astronomical high tides. Ground floor structures in low-elevation zones face severe submersion risks.
02Boundary Layer Wind Shear & Built Environment Drag
Grade A (Anemometer Ground Truth Archive)Tropical cyclones entering the local coastal zone generate sustained gale-force winds exceeding 83.0 km/h with peak gusts surpassing 83.0 km/h.
Extremely low delta plain (0.5–2m above sea level) dissected by hundreds of tidal channels.
As tropical cyclone winds transition from frictionless open ocean to rugged urban coastal surfaces, intense velocity shears and canyon aerodynamic funneling develop between street canyons and high-rise clusters.
Roof membranes, exterior curtain glass, rooftop HVAC units, and unanchored signage are subjected to localized negative pressure suction peaks (uplift failure).
03Compound Pluvial Inundation & Riverine Backwater
Grade B (Regional Hydrological Gage Observations)Slow-moving or stalling cyclones within 300 km deliver multi-day cumulative precipitation commonly exceeding 250–500 mm within 24 to 48 hours.
Low-lying drainage outfalls discharging directly into tidal rivers or bays with minimal hydraulic gravity gradient.
When peak overland stormwater runoff coincides with storm surge wave setup, coastal river mouths become hydraulically choked (tailwater backwater effect), preventing stormwater egress and forcing water back into municipal conduits.
Inland lowlands and underpasses flood rapidly even before the storm center makes closest approach, cutting off secondary evacuation arteries.
🛡️ 지역별 건물 보강 및 단계별 대피 지침
해안 지형 및 침수 취약성에 맞춘 재난 대응 수칙.
- •Inspect roof fastenings, remove outdoor loose debris, and seal terrace drainage grates.
- •Deploy certified hurricane shutters or impact-rated plywood over vulnerable seaward fenestration.
- •Verify generator fuel reserves and relocate critical utilities above the local 100-year base flood elevation.
- •Move all vehicles from underground parking garages to designated elevated parking structures.
- •Prepare 72-hour emergency potable water reserves (minimum 3 liters per person per day) and non-perishable rations.
- •Strictly comply with local emergency management mandatory evacuation orders for coastal zones A & B.
🌐 동일 해역 연안 도시 방재 네트워크
동일 해역 내 인접 연안 도시들의 기상 위험 분석 탐색.