Analyses of landuse change impacts on catchment runoff using different time indicators based on SWAT model

摘要: Abstract Previous researches mainly focused on the runoff responses to landuse change based annual, seasonal or monthly time scales, there are few studies daily scale. We conducted a comprehensive investigation into scale as well annual and scales using SWAT, compared impacts of with different indicators quantitatively. Jinjiang, coastal catchment southeast China humid sub-tropical climate, was used for simulations. A calibrated SWAT model produced satisfactory reproduction processes over nine-year (2002–2010) period at three gauging stations. Runoff then simulated same meteorological input but two scenarios (1985 2006, reduced forest increased cropland urbanized area). The results showed varying in among catchments. had smallest increase between scenarios, runoffs medium rates (increasing all months except October–November), largest flood peaks decrease drought flows, because variable influence interception/evapotranspiration loss, percolation antecedent soil water storage. Indicators (annual runoff, maximum 1-day 5-day minimum 7-day runoff) proved appropriate analysing impacts.