Spatial modeling of sediment transfer and identification of sediment sources during snowmelt in an agricultural watershed in boreal climate

A1 Originalartikel i en vetenskaplig tidskrift (referentgranskad)


Interna författare/redaktörer


Publikationens författare: Carlos Gonzales-Inca, Pasi Valkama, Jan-Olof Lill, Joakim Slotte, Eila Hietaharju, Risto Uusitalo
Publiceringsår: 2018
Tidskrift: Science of the Total Environment
Volym: 612
Artikelns första sida, sidnummer: 303
Artikelns sista sida, sidnummer: 312


Abstrakt

Sediment transfer patterns during snowmelt were studied in a small Finnish agricultural watershed. Erosion
rates were high as a consequence of high runoff volumes over saturated soil that partly lacked vegetation
cover. Automatic high-frequencymonitoring data of sediment and phosphorus concentrations in stream showed
a clock-wise hysteresis loop as a dominant pattern. GIS-based modeling of runoff and soil erosion, using LiDAR
DTMdata, 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.


Senast uppdaterad 2019-08-12 vid 03:26