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  • 1
    Language: English
    In: Hydrology Research, 11/2013, Vol.44(6), p.995
    Description: This study uses a high-frequency discharge and nitrate concentration dataset from the Weida catchment in Germany for the catchment scale hydrologic response analysis. Nitrate transport in the catchment is mostly conservative as indicated by the nitrate stable isotope ( delta 15N and delta 18O) analysis. Discharge-nitrate concentration data from the catchment show distinctive patterns, suggesting flushing and dilution response. A self-organizing feature map-based methodology was employed to identify such patterns or cluster in the datasets. Based on knowledge of the catchment conditions and prevailing understanding of discharge-nitrate concentration relationship, the clusters were characterized into five qualitative flow responses: (1) baseflow; (2) subsurface flow increase; (3) surface runoff increase; (4) surface runoff recession; and (5) subsurface flow decrease. Such qualitative flowpaths were used as soft data for a multi-objective calibration of a hydrological model (WaSiM-ETH). The calibration led to a reasonable simulation of overall discharge (Nash-Sutcliffe coefficient: 0.84) and qualitative flowpaths (76% agreement). A prerequisite for using such methodology is limited biogeochemical transformation of nitrate (such as denitrification).
    Keywords: Catchment Area ; Biogeochemistry ; Denitrification ; River Discharge ; Hydrology ; Nitrogen Isotopes ; Oxygen Isotope Ratio ; Runoff ; Response Analysis ; Oxygen Isotopes ; Hydrologic Analysis ; Nitrate Transport ; Numerical Simulations ; Catchment Basins ; Base Flow ; Surface Runoff ; Nitrogen Isotopes ; Subsurface Flow ; Isotopes ; Nitrates ; Biogeochemistry ; Denitrification ; Catchments ; Simulation ; Hydrology ; Hydrologic Models ; Assessments ; Surface Runoff ; Calibrations ; Nitrates ; Denitrification ; Catchment Areas ; Storm Seepage ; Hydrologic Data ; Hydrologic Models ; Assessments ; Surface Runoff ; Calibrations ; Nitrates ; Denitrification ; Catchment Areas ; Storm Seepage ; Hydrologic Data ; Germany ; Freshwater ; Identification of Pollutants ; Sewage ; General (556) ; General ; General ; Cluster Analysis ; Discharge-Nitrate Concentration Relationship ; Hydrological Flowpaths ; Model Calibration ; Nitrate Stable Isotopes ; Self-Organizing Feature Maps;
    ISSN: 0029-1277
    ISSN: 19989563
    E-ISSN: 22247955
    Source: CrossRef
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