Development of a Groundwater Monitoring Network for the Gateway Lake Rehabilitation Study

Transcription

1 Development of a Groundwater Monitoring Network for the Gateway Lake Rehabilitation Study Travis D. Yonts Hydraulic Engineer U.S. Army Corps of Engineers Omaha District Sheraton Hotel October 31, /2/ Eastern South Dakota Water Conference & 52nd Annual Midwest Groundwater Conference Slide 1

2 Project Investigators Travis D. Yonts Hydraulic Engineer, U.S. Army Corps of Engineers, Omaha District Doug Clemetson Hydrology Section Chief, U.S. Army Corps of Engineers, Omaha District Greg Johnson Project Manager, U.S. Army Corps of Engineers, Omaha District 11/2/ Eastern South Dakota Water Conference & 52nd Annual Midwest Groundwater Conference Slide 2

3 Background Gateway Lake Rehabilitation Study South Sioux City, Nebraska Project objectives is to improve wildlife habitat and water quality Part of former oxbow Crystal Lake 11/2/ Eastern South Dakota Water Conference & 52nd Annual Midwest Groundwater Conference Slide 3

4 South Dakota Nebraska Iowa 11/2/ Eastern South Dakota Water Conference & 52nd Annual Midwest Groundwater Conference Slide 4

5 Background Groundwater monitoring network Objective: Determine the hydrologic connection between surface and groundwater in the area Onset HOBO Level Loggers installed at 13 locations Based on locations from previous work by USACE 9 groundwater, 4 surface water Data collected during fall and spring Missouri River stage changes for navigation support Data collection commenced fall of /2/ Eastern South Dakota Water Conference & 52nd Annual Midwest Groundwater Conference Slide 5

6 MRNW South Sioux City, NE Missouri River N PZ 2 PZ 3 CC I-129/Hwy 20 PZ 1 PZ 4 GL PZ 6 PZ 5 PZ 9 PZ 8 PZ 7 Hwy 77 Hwy 110 MRSE 11/2/ Eastern South Dakota Water Conference & 52nd Annual Midwest Groundwater Conference Slide 6

7 HOBO Level Logger General specifications 15.0 cm x 2.5 cm (5.91 in x 0.97 in) Weight of 7.0 g Memory stores 21,000 events Temperature specifications Range of -20 to 50 o C Accuracy +/ o C at 20 o C +/ o C over -5 o C to 40 o C Resolution of 0.10 o C at 20 o C 11/2/ Eastern South Dakota Water Conference & 52nd Annual Midwest Groundwater Conference Slide 7

8 HOBO Level Logger Water Level specifications Range of 0.0 to 9.0 m Accuracy of +/- 0.5 cm (+/- 0.05% FS) Resolution of 0.21 cm 11/2/ Eastern South Dakota Water Conference & 52nd Annual Midwest Groundwater Conference Slide 8

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11 Mo. River Rating Curves MRNW stage (ft msl) y = x R 2 = USGS South Sioux City gage (ft msl) Missouri River northwest location (MRNW) MRSE stage (ft msl) Missouri River southeast location MRSE y = x R 2 = USGS South Sioux City gage (ft msl) 11/2/ Eastern South Dakota Water Conference & 52nd Annual Midwest Groundwater Conference Slide 11

12 Results Data analysis Determine groundwater response times and magnitude of groundwater change at piezometer locations due to changes in Missouri River flow. Compare current groundwater levels to those measured in Determine the impact of Missouri River degradation. Develop and calibrate a model to predict groundwater response times and stage changes due to different river levels. Can be used to assess different design alternatives at Gateway Lake. 11/2/ Eastern South Dakota Water Conference & 52nd Annual Midwest Groundwater Conference Slide 12

13 Results Rising Data and series falling of trend next slide Change in water level (ft) /5/06 10/7/06 10/9/06 10/11/06 10/13/06 10/15/06 10/17/06 10/19/ PZ-1 PZ-2 PZ-3 PZ-4 PZ-5 PZ-6 PZ-7 PZ-8 PZ-9 CC Date Sample of collected data from HOBO data loggers. Data has been normalized. 11/2/ Eastern South Dakota Water Conference & 52nd Annual Midwest Groundwater Conference Slide 13

14 Results Change in groundwater stage (ft) Response Time Piezometer 5 Missouri River northwest location Groundwater fluctuation Measured Missouri River stage (ft) /5/06 10/7/06 10/9/06 10/11/06 10/13/06 10/15/06 10/17/06 10/19/06 Date 0.0 Example plot used to examine response times and groundwater fluctuations. 11/2/ Eastern South Dakota Water Conference & 52nd Annual Midwest Groundwater Conference Slide 14

15 Results Data analysis Determine groundwater response times and magnitude of groundwater change at piezometer locations due to changes in Missouri River flow. Compare current groundwater levels to those measured in Determine the impact of Missouri River degradation. Develop and calibrate a model to predict groundwater response times and stage changes due to different river levels. Can be used to assess different design alternatives at Gateway Lake. 11/2/ Eastern South Dakota Water Conference & 52nd Annual Midwest Groundwater Conference Slide 15

16 Results Oct 6, 2006 Feb 22, 2007 July 10, Elevation (ft msl) Oct 6, 2006 Feb 22, July 10, Elevation (ft msl) Distance (ft) Water surface profile MRNW, PZ- 3, PZ-4, PZ-5, PZ-7, and MRSE Distance (ft) Water surface profile MRNW, PZ-1, PZ-6, PZ-8, and MRSE. 11/2/ Eastern South Dakota Water Conference & 52nd Annual Midwest Groundwater Conference Slide 16

17 MRNW South Sioux City, NE Missouri River N PZ 2 PZ 3 CC I-129/Hwy 20 PZ 1 PZ 4 GL PZ 6 PZ 5 PZ 9 PZ 8 PZ 7 Hwy 77 Hwy 110 MRSE 11/2/ Eastern South Dakota Water Conference & 52nd Annual Midwest Groundwater Conference Slide 17

18 Results Elevation (ft) Oct 6, 2006 Feb 22, 2007 Winter Summer 1959 Spring Distance (ft) Comparison of and water surface profiles MRNW, PZ-3, PZ-4, PZ-5, PZ-7, and MRSE. For reference, the bed of the Missouri River has degraded approximately 8 ft from 1960-present at South Sioux City, NE. 11/2/ Eastern South Dakota Water Conference & 52nd Annual Midwest Groundwater Conference Slide 18

19 Results Data analysis Determine groundwater response times and magnitude of groundwater change at piezometer locations due to changes in Missouri River flow. Compare current groundwater levels to those measured in Determine the impact of Missouri River degradation. Develop and calibrate a model to predict groundwater response times and stage changes due to different river levels. Can be used to assess different design alternatives at Gateway Lake. 11/2/ Eastern South Dakota Water Conference & 52nd Annual Midwest Groundwater Conference Slide 19

20 Results This is the next step!!! 11/2/ Eastern South Dakota Water Conference & 52nd Annual Midwest Groundwater Conference Slide 20

21 Conclusions A groundwater monitoring network was successfully established in and around South Sioux City, NE. Results illustrate the connection between surface and groundwater in the area. Next develop/calibrate a model to predict groundwater response times and stage changes due to different river levels. Seasonal groundwater fluctuations Missouri River degradation Use field and modeling data when evaluating design alternatives for Gateway Lake. 11/2/ Eastern South Dakota Water Conference & 52nd Annual Midwest Groundwater Conference Slide 21

22 Happy Halloween any questions??? 11/2/ Eastern South Dakota Water Conference & 52nd Annual Midwest Groundwater Conference Slide 22