Effects of land use intensity on stormwater runoff and its temporal occurrence in cold climates

摘要: The impacts of land use intensity, here defined as the degree imperviousness, on stormwater volumes, runoff rates and their temporal occurrence were studied at three urban catchments in a cold region southern Finland. with ‘High’ ‘Intermediate’ located around city centre, characterized by 89% 62% impervious surfaces, respectively. ‘Low’ catchment was situated residential area 19% imperviousness. During 2-year study period divergent weather conditions, generation correlated positively imperviousness: largest annual volumes highest coefficients number events occurred High catchment. Land intensity also altered seasonality runoff: Most generated during warm year, whereas contribution to Low took place period. In two most urbanized catchments, spring snow melt few weeks earlier than rate Intermediate higher summer melt, these more several times Our suggests that effects are season dependent climates seasons diminish differences between intensities. Copyright © 2013 John Wiley & Sons, Ltd.