Groundwater Hydrology
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1 University of California, Davis Department of Land, Air and Water Resources Hopland Research and Extension Center Groundwater Hydrology Workshop: Impact of Drought on Livestock Oct/2014 Sam Sandoval, PhD Assistant Professor C.E. Specialist in Water Resources
2 Overview Hydrology and Groundwater - What is Groundwater? How fast does groundwater move? Where does groundwater come from and where does it go?
3 Groundwater Hydrology
4 What is groundwater? An underground lake? A network of underground rivers? A rectangular network of pipelike water arteries? A giant sponge?
5 What is groundwater? Groundwater = Water Completely filling Pores/Fractures
6 Groundwater in Different Sediments and Rocks
7 What is groundwater? Unsaturated Zone Saturated Zone
8 Unsaturated Zone AKA Vadose zone ( Zone of aeration ) above the water table soil pores contain either air or water
9 saturated Zone Aquifers: Water bearing properties; this is the saturated zone Confined: Soil or rock below the land surface that is saturated with water. There are layers of impermeable material both above
10 Springs
11 Confined Unconfined Aquifers
12 Unconfined Aquifer Losing stream
13 Unconfined Aquifer Gaining stream
14 Other Types of Aquifers Aquiclude: contains water but cannot transmit it rapidly enough to furnish a significant supply to a well or spring. Aquitard ( confining unit ): lowpermeability zone that retards, but does not prevent, the flow of water. It does not readily yield water for beneficial uses but can serve as a ground water storage unit. Aquifuge: Contains no geologic openings and cannot hold, transport water
15 Aquifers Comes in All Shapes and Sizes To be a good aquifer 1 - good porosity (space between grains) 2 - good permeability (connection btwn
16 Aquifers are interconnected too Cross contamination concerns Subsurface contaminant transport
17 Direction of Groundwater Flow?
18 Map from: Direction of Regional GW Flow
19 Direction of Groundwater Flow? Unconfined Aquifer
20 California groundwater
21 Courtesy, Claudia Fawn, USGS, 2008
22 Sediments => result of erosion, water, wind, lake deposition, ocean bay deposition fractured bedrock of California s mountain ranges
23 Snowmelt Runoff Snowmelt Runoff Rainfall
24 Snowmelt Runoff Snowmelt Runoff Rainfall
25 Snowmelt Runoff Snowmelt Runoff Rainfall
26 Snowmelt Runoff Snowmelt Runoff Rainfall
27 Snowmelt Runoff Snowmelt Runoff Rainfall
28 Snowmelt Runoff Snowmelt Runoff Rainfall
29 Snowmelt Runoff Snowmelt Runoff Rainfall
30 Snowmelt Runoff Snowmelt Runoff Rainfall
31 Local & regional Groundwater Flow
32 Cone of Depression near a well from: U.S. Geological Survey, Ground Water and the Rural Homeowner
33 Snowmelt Runoff Snowmelt Runoff Rainfall Rainy Season
34 Groundwater Extraction Growing Season
35 Snowmelt Runoff Snowmelt Runoff Rainfall Rainy Season
36 Groundwater Extraction Growing Season
37 Snowmelt Runoff Snowmelt Runoff Rainfall X X X Rainy Season (Droughts) X
38 Groundwater Extraction Growing Season (Droughts)
39 Groundwater Extraction Growing Season (Droughts)
40 Groundwater Extraction Growing Season (Droughts)
41 Groundwater Challenges State GW source Problems Depletion Seawater intrusion Subsidence Management strategies?
42 Groundwater Depletion
43 Seawater Intrusion
44 Subsidence What s going on here? A dropping of the land surface as a result of ground water being pumped. Cracks and fissures can appear in the land. Subsidence
45 Solutions: Water Budget Water Balance! ΔS = P R G ET S: Storage P: Precipitation R: Runoff G: Ground infiltration
46 Solutions: Conjunctive Use Coordinated use of surface water and groundwater to meet crop demand Active: artificial recharge; SW intentionally percolated or injected into
47 Solutions: Management of Artificial recharge (MAR) Groundwater management: artificial recharge to store excess water + improving water quality Water traps Drainholes Cutwaters Infiltration basins
48 SolNs: Other Recharge methods Water traps: increase infiltration in streambeds. The traps are earthen dams of variable height Cutwaters: excavations of
49 Use the water that you need, but not a drop more Usa el agua que necesites, pero ni una gota mas Thanks samsandoval@ucdavis.edu
50
51
52 Space and Time Disconnect between Water Supply and Water Use WATER USERS RAIN
53 California groundwater
54 Hydrology Water Cycle
55 Hydrology and Hydrologic cycle Precipitation Runoff Evaporation EvapoTranspiration Infiltration
56 Weather, Climate, Atmosphere and Climate Change
57 Weather and Climate Climate is what you expect; weather is what you get Mark Twain Weather Climate Actual state of the atmosphere at a particular time Statistical description of weather over a period of time, usually a few decades. Important for long term decisions
58 Atmosphere
59 Atmosphere Not GHG 78% of N2 21% of O2 1% of Argon 99.95% 0.05% GHG
60 Energy coming from the Sun
61 Greenhouse gas effect Greenhouse effect The heating of the Earth s surface by the atmosphere. In other words, the atmosphere warms the surface by making it harder for the surface to lose energy to space. No Atmosphere Earth Surface Baby Blanket Effect With Atmosphere Earth Surface
62 Greenhouse gas effect Baby Blanket Effect
63 Global energy Balance
64 Atmosphere Not GHG 78% of N2 21% of O2 1% of Argon 99.95% 0.05% remaining 0.039% CO % CH % N2O Halocarbons Ozone
65 Where GHG come from? GHG absorb energy (infrared photons) to keep the earth warm(responsible for GHG effect) Water Vapor Natural: Evaporation from the oceans and is removed through rainfall, humans, animals bacteria and plants (respiration). Human induced: Through reservoir evaporation, CO2 (Carbon Dioxide) Natural: Humans, animals bacteria and plants (respiration). Human induced: Fossil fuel combustion release to the atmosphere carbon dioxide the that was sequestrated in rocks for hundreds of million of year. Long residence 100K years
66 Where GHG come from? CH4 (Methane) Natural: wetlands, termites, emissions from the oceans, geological sources. Human induced: Rising livestock (cattle, goars and sheep), rice paddies (bacteria in the soil produce methane), landfills, petrochemical industry, burning of forest and other biomass. Long residence, Decades N2O (Nitrous Oxide) Natural: Produced during thunderstorms, is caused by splitting of Nitrogen Molecules Human induced: Industrial sources (Agriculture fertilization), fossil fuel combustion (oil and coal)
67 GHG history Carbon Dioxide- increases primarily from fossil fuel burning, deforestation Methane- increases primarily from intensive agriculture, poor natural gas production practices Nitrous Oxide- increases primarily from vehicles, agriculture Sulfur Aerosols (dust)- changes primarily from volcanoes, fossil fuel (coal) burning
68 So what do you think is happening if the GHG concentration in the Atmosphere is increasing?
69 Temperatur e Sea level Snow cover IPCC (2007). Climate Change 2007: Synthesis Report
70 Continental temperature Change
71 Climate Change Climate change Any systematic change in the long term statistics of climate elements (temperature, pressure, winds) sustained over several decades longer. Compare the climate for one period against another, and if the statistics have change, then the climate has changed Anomaly The difference between a climate statistic and a reference value Why? Absolute values vary sharply, but changes across space are constant over a much longer distance Anomaly = Time Series Reference
72 Climate change in Napa?
73 Weather stations in Napa Oakville Station (North) Carneros Station (West Airport)
74 12 Oakville Station (North) Inches Precipitation Inches Carneros Station (West Airport)
75 12 10 F Oakville Station (North) Temperature F Carneros Station (West Airport)
76 Avg. Min. Temperature Carneros Station (West Airport) Avg. Min. Temperature (F) Oakville Station (North) Avg. Min. Temp. (F)
77 Oakville Station (North) Humidity Rel. Humidity (%) Carneros Station (West Airport) Relative Humidity (%)
78 Thanks Use the water that you need, but not a drop more Usa el agua que necesites, pero ni una gota mas
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