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<p>Precise assessment of building components’ exposure to driving rain is imperative for enhancing building durability, safeguarding occupant health, and mitigating economic and environmental costs. In this study, Annual Driving Rain Indices (<i>aDRI</i>) have been estimated for Bangladesh’s coastal districts using meteorological data of various temporal resolutions (i.e., daily, monthly and annual, yielding <i>daDRI</i>, <i>maDRI</i> and <i>aaDRI</i>, respectively) and corresponding driving rain maps, illustrating buildings’ exposure levels to driving rain, have been produced. Correlations between driving rain indices (i.e., <i>daDRI – maDRI</i>, <i>daDRI – aaDRI</i>, and <i>maDRI—aaDRI</i>) have been established to facilitate the <i>daDRI</i> estimation for locations lacking daily data. Further analyses have been conducted to observe the temporal trend of <i>daDRI</i>, rainfall and wind speed over years, to explore the directional distribution of driving rain exposure to buildings, and to estimate the wind-driven rain (WDR) load on building façades with various orientations using the ISO semi-empirical model. Results show that the entire coastal area of Bangladesh (and hence the buildings in this region) is susceptible to significant amount of driving rain, even while using coarser-resolution data which has been found to underestimate driving rain amounts. The <i>daDRI</i>, rainfall and wind speed trends indicate the direct impact of increasing rainfall on the rising driving rain index values. The relationships between different driving rain indices suggest the dominant influence of prevailing rainfall characteristics, rather than geographic location, on driving rain exposure. Estimates of WDR loads on building façades have indicated that the south-facing façades of coastal buildings in Bangladesh are the most susceptible to high levels of such loads.</p>

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Assessment of building components’ exposure to driving rain in Bangladesh’s coastal region

  • 期刊论文

  • 发表日期：

    2025年1月12日

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  • Uzzwal Kumar Deb Nath,
  • Shrabani Sarma

摘要

Precise assessment of building components’ exposure to driving rain is imperative for enhancing building durability, safeguarding occupant health, and mitigating economic and environmental costs. In this study, Annual Driving Rain Indices (aDRI) have been estimated for Bangladesh’s coastal districts using meteorological data of various temporal resolutions (i.e., daily, monthly and annual, yielding daDRI, maDRI and aaDRI, respectively) and corresponding driving rain maps, illustrating buildings’ exposure levels to driving rain, have been produced. Correlations between driving rain indices (i.e., daDRI – maDRI, daDRI – aaDRI, and maDRI—aaDRI) have been established to facilitate the daDRI estimation for locations lacking daily data. Further analyses have been conducted to observe the temporal trend of daDRI, rainfall and wind speed over years, to explore the directional distribution of driving rain exposure to buildings, and to estimate the wind-driven rain (WDR) load on building façades with various orientations using the ISO semi-empirical model. Results show that the entire coastal area of Bangladesh (and hence the buildings in this region) is susceptible to significant amount of driving rain, even while using coarser-resolution data which has been found to underestimate driving rain amounts. The daDRI, rainfall and wind speed trends indicate the direct impact of increasing rainfall on the rising driving rain index values. The relationships between different driving rain indices suggest the dominant influence of prevailing rainfall characteristics, rather than geographic location, on driving rain exposure. Estimates of WDR loads on building façades have indicated that the south-facing façades of coastal buildings in Bangladesh are the most susceptible to high levels of such loads.