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Utilizing Stable Isotopes ( 2 H & 18 O) to Identify Water Types of the Floridan Aquifer System in Southwest Florida PowerPoint Presentation
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Utilizing Stable Isotopes ( 2 H & 18 O) to Identify Water Types of the Floridan Aquifer System in Southwest Florida - PowerPoint PPT Presentation


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Utilizing Stable Isotopes ( 2 H & 18 O) to Identify Water Types of the Floridan Aquifer System in Southwest Florida. 20 th Salt Water Intrusion Meeting June 24 , 2008. Authors: Ed Rectenwald, PG MWH Americas Michael Bennett, PG Boyle Engineering. Presentation Overview. Background

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Utilizing Stable Isotopes (2H & 18O) to Identify Water Types of the Floridan Aquifer System in Southwest Florida

20th Salt Water Intrusion Meeting

June 24 , 2008

Authors: Ed Rectenwald, PG

MWH Americas

Michael Bennett, PG

Boyle Engineering

presentation overview
Presentation Overview
  • Background
  • Hydrogeology
  • Geochemistry
    • Inorganics
    • Stable Isotopes
  • Summary
  • Conclusions

Overview

Background

Hydrogeology

Geochemistry

Summary

Conclusions

why stable isotopes
Why Stable Isotopes?
  • Identify different water bodies in the aquifer system
  • Better understand groundwater circulation patterns
  • Identify possible recharge and discharge areas

Overview

Background

Hydrogeology

Geochemistry

Summary

Conclusions

investigated wells
Investigated Wells
  • Five FAS test wells (TW) owned by the SFWMD
    • GLF-5
    • LAB-TW
    • IWSD-TW
    • I-75 TW
    • BICY-TW
  • Seven FAS monitor wells owned and operated by various Water Reclamation Facilities (WRF)
    • Zemel Road Landfill
    • Burnt Store WRF
    • North Fort Myers WRF
    • Fort Myers Beach WRF
    • North Collier Regional WRF
    • South Collier Regional WRF
    • Marco Island WRF

Overview

Background

Hydrogeology

Geochemistry

Summary

Conclusions

quantity of wells sampled per hydrogeologic unit
Quantity of Wells Sampled Per Hydrogeologic Unit
  • Upper Floridan Aquifer – Nine wells
  • Middle Confining Unit – Thirteen wells
  • Lower Floridan Aquifer – Five wells

Overview

Background

Hydrogeology

Geochemistry

Summary

Conclusions

study area
Study Area

Overview

Background

Hydrogeology

Geochemistry

Summary

Conclusions

southwest florida hydrogeology
SouthwestFloridaHydrogeology

Overview

Background

Hydrogeology

Geochemistry

Summary

Conclusions

hydrogeology generalized cross section
HydrogeologyGeneralized Cross-Section

Overview

Background

Hydrogeology

Geochemistry

Summary

Conclusions

chlorides and tds in the fas
Chlorides and TDS in the FAS

Overview

Background

Hydrogeology

Geochemistry

Summary

Conclusions

piper tri linear diagram applying frazee s geochemical pattern analysis
Piper Tri-Linear Diagram Applying Frazee’s Geochemical Pattern Analysis

Overview

Background

Hydrogeology

Geochemistry

Summary

Conclusions

stable isotopes in the fas
Stable Isotopes in the FAS

Overview

Background

Hydrogeology

Geochemistry

Summary

Conclusions

relationship between 2 h and 18 o
Relationship Between 2H and 18O

Overview

Background

Hydrogeology

Geochemistry

Summary

Conclusions

spatial distribution of isotopes in the ufa
Spatial Distribution of Isotopes in the UFA

-2.08

-10.46

-0.85

-4.54

-1.43

-6.24

-1.60

-7.71

Overview

Background

Hydrogeology

Geochemistry

Summary

Conclusions

-1.46

-8.79

-1.69

-7.77

Legend

18O/2H

-1.14

-1.53

-1.19

-5.53

-1.26

-6.60

-0.08

-5.17

spatial distribution of isotopes in the mcu
Spatial Distribution of Isotopes in the MCU

-1.92

-5.36

-0.42

0.97

0.43

2.05

-1.11

-11.35

-1.14

-8.06

Overview

Background

Hydrogeology

Geochemistry

Summary

Conclusions

0.48

0.18

-1.59

-7.90

0.40

9.00

Legend

18O/2H

0.55

5.33

0.47

0.53

-0.35

0.28

spatial distribution of isotopes in the lfa
Spatial Distribution of Isotopes in the LFA

-0.41

-1.67

Overview

Background

Hydrogeology

Geochemistry

Summary

Conclusions

0.47

0.02

0.12

3.76

0.65

1.16

Legend

18O/2H

0.73

0.06

summary
Summary
  • Stable Isotopic Analysis
    • UFA
      • Meteoric in origin
      • Different climate and/or meteoric water at time of recharge
      • Evaporation minimal at time of recharge
    • MCU
      • Mixture of meteoric and seawater
      • Concentrations are location dependent
      • Hydraulic connection between UFA and LFA
    • LFA
      • Seawater in origin
      • Recharged after the “Last Glacial Period” (~15,000 years)

Overview

Background

Hydrogeology

Geochemistry

Summary

Conclusions

conclusions
Conclusions
  • Need to improve our understanding of the FAS
    • Additional geochemical analyses
      • Radiocarbon
      • Noble Gases
    • Modeling the effects of sea level change
    • Potentiometric head data of the FAS
    • Additional inland monitor/test wells

Overview

Background

Hydrogeology

Geochemistry

Summary

Conclusions