Spatial Analysis of High-Resolution Radar Rainfall and Citizen-Reported Flash Flood Data in Ultra-Urban New York City

摘要: New York City (NYC) is an ultra-urban region, with over 50% impervious cover and buried stream channels. Traditional flood studies rely on the presence of gages to detect stage discharge, but these methods cannot be used in areas. Here we create a high-resolution radar rainfall dataset for NYC utilize citizen expert reports flooding throughout city study flash NYC. Results indicate that interactions between urban area land–sea boundary have important impact spatial variability both heavy flooding, sometimes contrast results obtained other cities. Top days daily hourly exhibit maximum center extended region higher downwind city. The mechanism appears vary across city, high groundwater tables influencing more coastal areas rain rates or large volumes inland There also strong relationship sewer type frequency, fewer floods observed combined Flooding driven by one-hour one-day rainfall, which often substantially less than city-wide maximum.