Abstract
Sediment transfer patterns during snowmelt were studied in a small Finnish agricultural watershed. Erosionrates were high as a consequence of high runoff volumes over saturated soil that partly lacked vegetationcover. Automatic high-frequencymonitoring data of sediment and phosphorus concentrations in stream showeda clock-wise hysteresis loop as a dominant pattern. GIS-based modeling of runoff and soil erosion, using LiDARDTMdata, suggested that runoff and erosion mostly camefromcropland that had the highest sediment contribution index. Also sediment fingerprinting with Cesium-137 suggested cropland and stream bank were the most important sources of suspended sediments in streams. Because a major part of annual sediment transfer takes place during snowmelt, it is a critical period for annual losses of pollutants. Management practices that minimize springtime sediment and pollutant losses from cropland would be needed to make a marked impact on annual pollution transfer to stream waters.
Original language | Undefined/Unknown |
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Pages (from-to) | 303–312 |
Journal | Science of the Total Environment |
Volume | 612 |
DOIs | |
Publication status | Published - 2018 |
MoE publication type | A1 Journal article-refereed |