slide1
Download
Skip this Video
Download Presentation
Fengjing Liu and Mark Williams

Loading in 2 Seconds...

play fullscreen
1 / 18

Fengjing Liu and Mark Williams - PowerPoint PPT Presentation


  • 56 Views
  • Uploaded on

DETERMINATION OF SOURCES AND FLOWPATHS USING ISOTOPIC AND CHEMICAL TRACERS, GREEN LAKES VALLEY, ROCKY MOUNTAINS. Fengjing Liu and Mark Williams Department of Geography and Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO80309. HYDROLOGIC FLOWPATHS.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Fengjing Liu and Mark Williams' - zachary-frederick


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide1

DETERMINATION OF SOURCES AND FLOWPATHS USING ISOTOPIC AND CHEMICAL TRACERS, GREEN LAKES VALLEY, ROCKY MOUNTAINS

Fengjing Liu and Mark Williams

Department of Geography and Institute of Arctic and Alpine Research, University of Colorado, Boulder, CO80309

hydrologic flowpaths
HYDROLOGIC FLOWPATHS
  • Generally, 4 paths
  • Change over time
  • Change over space
objectives
OBJECTIVES
  • understanding the mechanism of stream flow generation in snow-dominated alpine basins
  • determining uncertainties of hydrograph separation by using different mixing models and tracers
research site and sample collection
RESEARCH SITE AND SAMPLE COLLECTION
  • Stream water - weekly grab samples
  • Snowmelt - snow lysimeter
  • Soil solution - zero tension lysimeter

Delta 18O, DOC, Solutes

mass balance model for water sources and flowpaths
MASS BALANCE MODEL FOR WATER SOURCES AND FLOWPATHS

Ci1Q1 + Ci2Q2 + Ci3Q3 + .. + CinQn = CitQt

Q1 + Q2 + Q3 + .. + Qn = Qt

C - tracer concentrations

Q - discharge (runoff)

i - tracers

n - water source or flow path components

t - stream flow

How we use 2 to 4 component mixing model

end member mixing analysis emma and pca
End-Member Mixing Analysis (EMMA) and PCA
  • Tracer concentrations distinct - time series plots
  • Tracers conservative - mixing diagram
  • Number of components - PCA
  • Qualification of end-member characterization
  • EMMA solutions for hydrograph separation
source water separation 2 components
SOURCE WATER SEPARATION- 2 COMPONENTS

Martnelli

GL4

Calendar Day (1996)

results for flow sources
RESULTS FOR FLOW SOURCES

GL4

Martinelli

Calendar Day (1996)

flowpath separation qualification of 2c separation
FLOWPATH SEPARATION - QUALIFICATION OF 2C SEPARATION
  • Na+, Si, SO42-, and K/Si are conservative at both catchments
  • 2-component flowpath separations using Na+, Si, SO42- are not successful in that characterization of the subsurface is difficult
  • Concentrations of those tracers vary a lot over soil horizons
flowpath separation k si
FLOWPATH SEPARATION - K/Si

Overland vs. subsurface flow

GL4

Calendar Day (1996)

flowpath separation doc
FLOWPATH SEPARATION - DOC

Upper soil horizon vs. deeper flow

GL4

flowpath separation 4 components
FLOWPATH SEPARATION - 4 COMPONENTS

Martinelli

2/16/77/5

GL4

2/25/39/34

emma pca diagram
EMMA PCA Diagram

Martinelli

GL4

4 c separation emma solutions
4-C SEPARATION - EMMA SOLUTIONS

Martinelli

GL4

Methods

3-Tracers (18O,K/Si,DOC)

Least square optimization (Na,Si,SO4,K/Si,18O,DOC)

PCA Projection (U) (Na,Si,SO4,K/Si,18O,DOC)

summary
SUMMARY
  • New water accounts for 95% at Mart, while new water decreases to 65% at GL4
  • K/Si and DOC are efficient tracers to identify overland and upper soil horizon flow
  • 3-tracer-4-component separation is superior to EMMA approach
  • Four flowpaths are successfully identified: overland, upper soil horizon, lower soil horizon, and base flow (2/16/77/5 at Mart; 2/25/39/34 at GL4)
ad