Aquifers in Alluvial Sediment Unconsolidated sands and rock saved by streams. Must be sufficiently extensive to deliver huge rates and volumes of water from wells River valley depleting glaciated territory Fault limited bowls Partially analyzed alluvial plain (High Plains) Mississippi embaymentSlide 2
Sea versus Shut Basin as Drainage Destination for Alluvial Sediments Sea Suspended load perhaps expelled Salts potentially evacuated Sea level change critical Closed Basin Fine-grained seds in framework Salts stay Isolated from impacts of ocean level change Affected by neighborhood atmosphereSlide 4
Alluvial aquifers in icy storesSlide 5
Large Glacial LakesSlide 6
Alluvial residue in glaciated zones Glaciers propel, scour seds., alter waterway course. Sed comp. relies on upon area/source material. Substantial scope of grn size. Till=clay-rock underneath ice sheet. Ocean level drops as ice advances. Water powered inclination increment. Disintegration, speed, conveying limit increment. Valleys chiseled into bedrock, more seasoned frigid silt (cover prior channel stores) Glaciers retreat. Release increments. Disintegration. Plaited streams, extensive silt limit. Outwash plain (sands and rock). Lakes before subsiding ice sheets. Lacustrine=clay-residue (varved)Slide 7
Alluvial silt in glaciated territories, Cont Sea level ascents, icy masses subside, water driven angle decreases, release reduces, conveying limit drops. Style changes from plaited to wandering. Lakes. Coarse-grn seds stored in etched valleys. Rock on base, fining upward. Thickness relies on upon conditions amid/taking after glaciation. Icy landforms Region changes with interglacial. Release diminishes. Dregs adjusted. Vital materials: Till, lacustrine, outwash, alluvial valley fill, diamicton, float. Complex facies conveyancesSlide 11
Gravel focal point inside a silty-mud tillSlide 12
AlluvialAquifer Systems Geometry Aquifer sort Properties Recharge/Discharge Flow design Chemistry ExamplesSlide 13
1:100 Geometry Channel stores Elongate, unthinkable bodies, twisted Length: numerous km Width: 0.1-a few km Thickness: 0.01-0.1 km Outwash stores, alluvial plain planar sheets 10s km evenly Thickness: 0.01-0.1 km 1:10Slide 14
Aquifer Types Unconfined Confined Both, unconfined with nearby restricting unit Deposits Channel fill in advanced valley Buried channel Outwash plain Alluvial plainSlide 15
Confining unit where fine grained Sand and rock, Primary aquifer Idealized setting Channel fill in current valley substratumSlide 17
Hydraulic conductivity of some major alluvial aquifersSlide 18
Storativity of major alluvial aquifers bound unconfinedSlide 19
Fining upward groupings in major alluvial aquifers Estimate how K fluctuates with profundity in alluvial aquifers? Straight line on log*log plot d 50 =C*Z b Log(20)- Log(3)=0.82 b=Slope=2/0.82=2.4 d 50 =C*Z 2.4 Hazen technique K=C 1 d 10 2 Alluvial: K=C 2 Z 4.8Slide 20
Infiltration through floodplain Losing stream including tributary Stormflow off uplands Recharge to alluvial aquifersSlide 21
Irrigation return stream Rise in waterway arrange, Bank stockpiling Rise in stream organize, FloodSlide 22
Discharge from cellar Main channel losing because of pumpingSlide 23
Discharges from Alluvial Aquifers To fundamental channel or tributaries Lakes on floodplain Wetlands WellsSlide 24
Streambed conductance impacts on gw/sw communication Fine-grained seds on streambed Fine-grained seds in topstratumSlide 25
10 Stream-parallel stream, Neither pick up nor lose 9 Losing achieve 10 9 Gaining losing Gaining achieve Preliminary elucidations of gw-sw collaborations utilizing head shapes 10 9 10 2. 3. 9 1. 4 .Slide 27
Draw a Hydrogeologic Conceptual Model of Alluvial AquifersSlide 28
Some cases Fox-Wolf River Basin, WI. Outwash Corning aquifer, NY. Waterway valley Andruscoggin. ME. Alluvial valley once immersed via seawater Irondogenese, NY, Alluvial valley once loaded with new water lake OthersSlide 29
Wisconsin DomeSlide 30
140 miles 20 miles Fox-Wolf River BasinSlide 31
Buried pre-cold valley, now secured by till and lacustrine storesSlide 32
What does this guide educate you regarding the Fox-Wolf River aquifer? Provincial GW stream designs? Where are thr energize and release zones? What controls? Expected fluxes? GW release zone? 30 milesSlide 34
Baseflow rate identified with T of surficial aquifer Composition of GW and SW comparativeSlide 35
Ground water move through surficial aquifer, Paleozoic sandstones, and release to waterwaySlide 36
Flow-through lakeSlide 39
Another major outwash storeSlide 41
Conceptual Model Recharge Streams Cape Cod Bay Fine-grained Sand/Silt Groundwater Flow Paths Saline Groundwater Bedrock Glacial Till Freshwater/Saltwater Interface South NorthSlide 44
Chemung stream valley, Corning, NY Limestone and shale bedrock on adjusted slopes 800 ft or more over the sand and rock aquifer on the valley floor.Slide 45
1 mile 5 milesSlide 47
4000 1:40 angle proportionSlide 50
A. Corning Aquifer Exercise 3000 ft Determine the level head slope at every area Estimate the ground water fluxes at every area Estimate the normal stream speeds Estimate the volumetric rate per unit length of waterway that the aquifer is adding to the streams at every area. Give a clarification to the contrasts between the two areas B.Slide 51
Water Balance Info given in GW Atlas ET=0.5 P 0.6Recharge is from uplands What is the aggregate baseflow flux to streams? Water Balance from Conceptual Model Recharge = Infiltration + Upland Runoff I=0.5P UR=0.6Re Re=0.5P+0.6Re Re=1.25P From guide, P = 40 inch/yr, so Re=50 in/yrSlide 52
Hardness = 2.5 Ca(mg/l) + 4.1 Mg(mg/l) <60 mg/l = delicate >150 mg/l = hard Water is magnesium bicarbonate sort. Take note of the hardness. The district is underlain by limestone and shaleSlide 53
16 MgpdSlide 54
Fine-grained marine residue underlie cold outwash in the Little Androscoggin aquifer in Maine.Slide 55
Glacial valley somewhat immersed by the oceanSlide 57
5000 ftSlide 59
Water Balance Info given in GW Atlas P=43 in/yr, ET=23 in/yr (0.53), Ru=20in/yr (0.46) Also given: Recharge as penetration more than 16 mi2 aquifer represents 16.4 cfs, overland from uplands 11.2 cfs, from waterway 1.4 cfs. 29 cfs add up to Re to aquifer Area of aquifer = 16 mi2 Are these steady? Exhibit with water equalizations. Ru=Baseflow+Storm=Recharge+Storm Total Recharge=baseflow= 29 cfs: more than 16 mi2= 24 in/yr 20 in/yr= 24 in/yr+Stormflow, Negative stormflow?? Issue Watershed Balance: P+OU=ET+Ru not the same as above Aquifer: Infilt+OU+RiverLoss=Baseflow Infiltration = 16.4 cfs; change over to flux over aquifer: 14 in/yr Overland from Upland= 11.2 cfs; 9 in/yr Total Recharge=baseflow= 29 cfs: 24 in/yr Ru=P+OU-ET=43+9-23=29 in/yr not the same as above Ru=Base+Storm, So, stormflow must be 5 in/yr; as a rule, the water flux values appear to be conflicting. Continuously make certain your water parities can be shut.Slide 60
Hydraulic head in frosty outwash, Little Androscoggin Aquifer, MaineSlide 61
7 Mgpd creationSlide 62
4 miles Aquifer filling a valley once possessed by new water cold lakeSlide 63
Structural Contours on BedrockSlide 66
4.3 MgpdSlide 68
Corning Aquifer. Ca, Mg, HCO3; Hardness: 225 ppm; TDS: 212 ppm 16 Mgpd Little Androscoggin, Na, K, Ca, HCO3; Hardness: 24-68ppm TDS 67-128 ppm alluvium bedrock Irondogenesee Aquifer, Ca, Na, HCO3, Cl, SO4; TDS 665, Hardness: 373 4 MgpdSlide 70
Some other alluvial aquifersSlide 71
Relative sizes of case alluvial aquifers 100 milesSlide 73
Dissolution of basic evaporites shapes profound troughs in Pecos River BasinSlide 75
80 Mgpd Water Quality: 1000+ mg/L basic because of fundamental evaporites and energize from saline surface water and water system return stream where vanishing has expanded salt substanceSlide 76
Water Quality Summary TDS Hardness Major particles
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