eastern shore well-logging program 2018 progress
TRANSCRIPT
• fourth annual logging run
• review background concepts
• log-analysis results
• possible early trends emerging
Eastern ShoreWell-Logging Program
2018 Progress
Groundwater Flow
ATLANTIC OCEAN
CHESAPEAKE BAY
FRESHSALTY
LAND SURFACE
WATER TABLE
*** VERTICAL SCALE GREATLY EXAGGERATED ***
P R E C I P I T A T I O N
High Rechargeor Low Withdrawal
ATLANTIC OCEAN
CHESAPEAKE BAY
FRESH
SALTY SALTYDEPRESS
P R E C I P I T A T I O N
RISE
Low Rechargeor High Withdrawal
ATLANTIC OCEAN
CHESAPEAKE BAY
SALTY SALTY
FRESH
RISE
P R E C I P I T A T I O N
DROP
Pumping-InducedSaltwater Movement
ATLANTIC OCEAN
CHESAPEAKE BAY
YEARS
DECADES - CENTURIES
FRESH
SALTY
LAND SURFACE
*** VERTICAL SCALE GREATLY EXAGGERATED ***
WELL
UPCONING
WEEKS-MONTHSREVERSIBLE
LATERAL INTRUSION
ShallowWater-Quality
ChangesATLANTIC OCEAN
CHESAPEAKE BAY
FRESHSALTY
*** VERTICAL SCALE GREATLY EXAGGERATED ***
INUNDATIONINUNDATION
INVERTED SALINITY
INVERTED SALINITY
STORM SURGESTORM SURGE
SURFACE SOURCES
Saltwater Monitoring
Well-Logging Network
• 12 USGS-DEQ observation wells
• sampled 2003
• logged 2008, 2016, 2017, 2018
LAND SURFACE
WELL
SCREEN
• direct observation
• costly• slow sample collection• lab analyses
• single water zone
Well-Sample Monitoring
PUMP
SAMPLE
Well-Log MonitoringLAND SURFACE
LOG
PROBE
RECORDER
“SEES OUT”
WELL•low cost
• fast field method• no lab
• entire profile
• indirect observation
• only shows changes in salinity over time
SCREEN
Well-Log MonitoringLAND SURFACE
PROBE “SEES OUT”
WELL
SCREEN
ELECTRICAL CONDUCTIVITY
TIME 3TIME 1 TIME 2
TIME 3TIME 1 TIME 2
Well-Log MonitoringLAND SURFACE
PROBE “SEES OUT”
WELL
SCREEN
ELECTRICAL CONDUCTIVITY
INCREASING
SALINITY
DECREASING SALINITY
Basis of Method
USGSOpen-File Report
2016-1194
UNADJUSTED LOGS ADJUSTED LOGS
South Florida Well Logging
1996
2014
18-YEAR RECORD
New Online Log-Data Resource