Solute transport dynamics in small, shallow groundwater-dominated agricultural catchments: insights from a high-frequency, multisolute 10 yr-long monitoring study

摘要: Abstract. High-frequency, long-term and multisolute measurements are required to assess the impact of human pressures on water quality due (i) high temporal spatial variability climate activity (ii) fact that chemical solutes combine short- dynamics. Such data series scarce. This study, based an original unpublished time from Kervidy-Naizin headwater catchment (Brittany, France), aims determine solute transfer processes dynamics characterise this strongly human-impacted catchment. The is a temperate, intensive agricultural catchment, hydrologically controlled by shallow groundwater. Over 10 yr, five (nitrate, sulphate, chloride, dissolved organic inorganic carbon) were monitored daily at outlet roughly every four months in concentrations all showed seasonal variations but patterns differed one another. Nitrate chloride exhibit rather smooth variations. In contrast, sulphate as well carbon dominated flood flushes. observed nitrate typical originating mainly fertilisers accumulated over several years They seasonally exported when upland groundwater connects with stream during wet season. Conversely, not specific catchments. These do come accumulate soil or groundwater; instead, they biogeochemically produced results allowed development generic classification system source locations each solute. It also considers stocking period dominant process limits transport stream, i.e. connectivity compartment. mechanistic can be applied any help its origin, storage production location mechanism similar