Background, Controlling Factors and Characteristics of Groundwater Pollution by Nitrate Nitrogen at Alluvial Fans

Nitrate nitrogen pollution in groundwater can be understood from three viewpoints: generation sources, mobility, and elimination effects (natural purification effects). Alluvial fans are often utilized for farmland where nitrate fertilizer (pollutant source) may used. pollutants readily spread at alluvial two controlling factors pollutant mobility high: permeability hydraulic gradient of groundwater. Moreover, the denitrification process, which is one most important natural effects, not expected to occur fan groundwater, seldom under anoxic conditions contains little organic matter. In numerous previous studies, has been researched using four main methods: water quality monitoring, calculations based on load per unit activity source, stable isotopic tracers, computed simulation models. As a result, processes reactions now evaluated quantitatively visualized. Of these, because an oxidation reaction ammonium sulfate, sources nitrogen, multiplies chemistry, it noted that NO3− : SO42− molar ratios δ13CDIC values secondary indicators identifying this process terms pollution.