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Understanding Dissolved Organic Matter Biogeochemistry Through In Situ Nutrient Manipulations in Stream Ecosystems

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Geochemical tracers to evaluate hydrogeologic controls on river salinization.

Stephanie J Moore¹, R L Bassett, Beiling Liu

¹Daniel B. Stephens & Associates Inc., 6020 Academy NE, Ste. 100, Albuquerque, NM 87109-3315, USA. smoore@dbstephens.com

|February 13, 2008

Summary

River salinization in arid regions is complex. This study found deep groundwater inflow, not just agriculture, is the main cause of increased salinity in the Lower Rio Grande.

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Clean Sampling and Analysis of River and Estuarine Waters for Trace Metal Studies

Clean Sampling and Analysis of River and Estuarine Waters for Trace Metal Studies

Published on: July 1, 2016

Area of Science:

Environmental Science
Hydrogeology
Geochemistry

Background:

River salinization is a global issue in arid/semiarid regions.
Historically, salinity sources include evaporation, irrigation, erosion, and groundwater inflow.

Purpose of the Study:

To identify and quantify anthropogenic vs. natural salinity sources in the Lower Rio Grande.
To investigate the dominant contributors to river salinization in the New Mexico-Texas border region.

Main Methods:

Utilized a conceptual model to identify water and salinity sources.
Designed a sampling plan to characterize identified sources.
Analyzed stable isotopes (B, S, O, H) and strontium isotopes, alongside basic chemical data.

Main Results:

Confirmed that deep groundwater inflow is the dominant source of salinity.
Stable isotopic ratios provided distinctive signatures for deep groundwater.
Evapotranspiration and agricultural processes alone cannot explain the observed salinization.

Conclusions:

Deep groundwater inflow is the primary driver of salinization in the Lower Rio Grande.
Isotopic and geochemical tracers are effective tools for identifying multiple solute sources in river systems.