Rainfall is one of the key terms involved in many hydrological processes, and it is particularly important in the field of urban hydrology. In this study, the focus is set on the impact on the precipitation patterns in Beijing in term of spatial and temporal variation, from the urbanization over last 50 years in which time the fast and continuous expansion of the city at dramatic scales, the rapid growth of residents population as well as human activities especially building of ground constructions, collectively and inevitably bring changes to the local climatic characteristics of the urbanized areas. It has been found that the spatial distribution has demonstrated a clear pattern shift over the region; the temporal distribution, although shows insignificant (decreasing) trends on many average terms, gives a clear indication of stable, gradual increase in maximum 1-h rainfall intensity accompanying with the slow-urbanizing period and large fluctuations in the rapid development period.
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