I am looking for a simple program tool or equations that estimate the concentrations of total phosphorus, nitrite, nitrate, and ammonium resulting from point and non point source emissions in river water. It is important that I could enter the loading of nutrients from point and non point sources which are available to me in this simple program.
Dear Anoop,
Thanks for your response and sent references. The equations in the sent references do not allow me to use my estimated loads of nitrate, nitrite, total phosphorus, and ammonium. I look for equations similar to that used for calculating total phosphorus in lakes. For example, Rechhow models such as:
P = L/(0.17z + 1.13z/Tw)
where P is the total phosphorus concentration, L aereal load to the lake in mg/yr/surface area of the lake in m2, z is the lake mean depth in m, and Tw is the residence time in the lake in years. I look for an equation for rivers in which I can use my own load estimations flowing into the river to estimate the nutrient concentrations. A simple program tool that allows me use my estimated loads in calculating the nutrient concentrations will also do. I look forward to your answer.
Best,
Simon
If you have some composition data /estimate you can use vminteq.
A very powerful freeware
https://vminteq.lwr.kth.se/
Dear Simon,
See the following link - USGS Report (Methods Used to Estimate Nutrient Fluxes). This may be useful.
https://toxics.usgs.gov/pubs/of-2007-1080/methods.html
Best wishes
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