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Using Stable Isotopes To Characterize The Groundwater Recharge In The Sierra Nevada Foothills California
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Book Synopsis Using Stable Isotopes to Characterize the Groundwater Recharge in the Sierra Nevada Foothills, California by : Nelson Ferney Bernal
Download or read book Using Stable Isotopes to Characterize the Groundwater Recharge in the Sierra Nevada Foothills, California written by Nelson Ferney Bernal and published by . This book was released on 2007 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Tracing Ground-water Movement by Using the Stable Isotopes of Oxygen and Hydrogen, Upper Penitencia Creek Alluvial Fan, Santa Clara Valley, California by : Kenneth S. Muir
Download or read book Tracing Ground-water Movement by Using the Stable Isotopes of Oxygen and Hydrogen, Upper Penitencia Creek Alluvial Fan, Santa Clara Valley, California written by Kenneth S. Muir and published by . This book was released on 1981 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Characterization of Natural Spring Waters of the San Bernardino Mountains Using Stable Isotopes of Oxygen and Hydrogen by : Alison Renee Sloat
Download or read book Characterization of Natural Spring Waters of the San Bernardino Mountains Using Stable Isotopes of Oxygen and Hydrogen written by Alison Renee Sloat and published by . This book was released on 2008 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this study was to characterize the natural spring waters of the San Bernardino Mountains using two stable isotopes. The isotopic results of this study will aid with tracing sources, movements, and mixing effects on groundwater receiving mountain-front recharge in the region.
Book Synopsis Stable Isotope and Groundwater Flow Dynamics of Agricultural Irrigation Recharge Into Groundwater Resources of the Central Valley, California by :
Download or read book Stable Isotope and Groundwater Flow Dynamics of Agricultural Irrigation Recharge Into Groundwater Resources of the Central Valley, California written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Intensive agricultural irrigation and overdraft of groundwater in the Central Valley of California profoundly affect the regional quality and availability of shallow groundwater resources. In the natural state, the[delta][sup 18]O values of groundwater were relatively homogeneous (mostly -7.0[+-] 0.5[per-thousand]), reflecting local meteoric recharge that slowly (1-3m/yr) flowed toward the valley axis. Today, on the west side of the valley, the isotope distribution is dominated by high[sup 18]O enclosures formed by recharge of evaporated irrigation waters, while the east side has bands of low[sup 18]O groundwater indicating induced recharge from rivers draining the Sierra Nevada mountains. Changes in[delta][sup 18]O values caused by the agricultural recharge strongly correlate with elevated nitrate concentrations (5 to>100 mg/L) that form pervasive, non-point source pollutants. Small, west-side cities dependent solely on groundwater resources have experienced increases of>1.0 mg/L per year of nitrate for 10-30 years. The resultant high nitrates threaten the economical use of the groundwater for domestic purposes, and have forced some well shut-downs. Furthermore, since>80% of modern recharge is now derived from agricultural irrigation, and because modern recharge rates are[approximately]10 times those of the natural state, agricultural land retirement by urbanization will severely curtail the current safe-yields and promote overdraft pumping. Such overdrafting has occurred in the Sacramento metropolitan area for[approximately]40 years, creating cones of depression[approximately]25m deep. Today, groundwater withdrawal in Sacramento is approximately matched by infiltration of low[sup 18]O water ( -11.0[per-thousand]) away from the Sacramento and American Rivers, which is estimated to occur at 100-300m/year from the sharp[sup 18]O gradients in our groundwater isotope map.
Book Synopsis Characterizing Groundwater Recharge by : J. Moran
Download or read book Characterizing Groundwater Recharge written by J. Moran and published by IWA Publishing. This book was released on 2004-01-01 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of the project was to demonstrate the value of age-dating and isotopic tracers in characterizing the flow dynamics and water quality changes in a complex groundwater domain that includes high capacity municipal pumping wells, a geologic fault, and artificial recharge facilities with deep lake-like recharge ponds. Characterizing water quality changes during recharge and transport in groundwater was also an objective of this investigation. Below (west of) the Hayward Fault (BHF), water ages correlated well with aquifer layer sequence. BHF tracers did not reach the BHF wellfield within the time frame of the experiment. Above (east of) the fault, (AHF) tracers reached the targeted wellfield in only 60 days, indicating substantial heterogeneity and a fast travel time along preferential pathways compared to the average travel time of 2+ years indicated by age-dating and more classical estimating methods. A reconnaissance of water quality, conducted concurrently with the tracer studies, suggested certain water quality improvements occurring in either the pond sediment or the near-pond aquifer media. Variations in groundwater age depended on location and depth. A survey of natural isotopes indicated mixing of young and older water in wells, increasing age with depth of aquifer layer, and possible dissolution of carbonate minerals. AHF tracer experiments, along with other analysis, suggested that tracers probably percolated preferentially at shallow depths in the pond near the shoreline. Much of the tracer remained in deep pond water over time, increasing residence time in down-gradient wells. The tracer studies provided evidence of preferential pathways and heterogeneity in the AHF aquifer and a fast minimum travel time to the AHF wellfield. The tracer added to BHF ponds was detected in just two monitoring wells, but not at the BHF wellfield over the 10-month period. An AHF tracer from a small pond spanning the fault did, however, appear at the BHF wellfield. BHF pond water flows mainly to distal portions of the groundwater basin, or reaches the wellfield over a slow, circuitous route. Originally published by AwwaRF for its subscribers in 2003 This publication can also be purchased and downloaded via Pay Per View on Water Intelligence Online - click on the Pay Per View icon below
Book Synopsis Final Report on the Groundwater Isotope Project in the Brentwood Region of East Contra Costa County, California by :
Download or read book Final Report on the Groundwater Isotope Project in the Brentwood Region of East Contra Costa County, California written by and published by . This book was released on 1995 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: Groundwater in the Brentwood region has been characterized using isotope hydrology techniques and have addressed resource issues regarding the future sustainability of groundwater, maintenance of existing supplies, and exploration of new supplies. The stable isotopes of oxygen and hydrogen indicate that groundwater is derived from two sources: ancient rain recharge, and recharge of agricultural irrigation water. Rain derived groundwater ages range from 1000 to (approximately)12,000 years old. Agricultural recharge groundwater is
Book Synopsis Characterizing Groundwater Recharge and Streamflow Using Stable Isotopes of Oxygen and Hydrogen by : Chanse M. Ford
Download or read book Characterizing Groundwater Recharge and Streamflow Using Stable Isotopes of Oxygen and Hydrogen written by Chanse M. Ford and published by . This book was released on 2016 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt: Potential changes to climate and precipitation patterns from anthropogenic influences like global climate change could have an impact on Michigan’s groundwater resources. Indirectly this could have an effect on Michigan’s surface waters as well, since groundwater and surface waters are intimately linked to form one system. This investigation utilized stable isotopes of oxygen and hydrogen found in precipitation, groundwater and surface waters to better understand the contribution of different types of precipitation to recharge of a shallow aquifer in Manistee National Forest, MI. The study also examines the contribution of this shallow groundwater to streamflow in the nearby White River. When combined with various physical and chemical hydrologic approaches, the dynamics of precipitation, groundwater flow and groundwater discharge into the stream become clearer. Samples from the different waters were collected from February 2015 to January 2016. During sampling groundwater head, stream discharge and other parameters were measured. These data provide valuable insight that will help the U.S. Forest Service better manage this natural resource.
Book Synopsis An Isotopic Investigation of the Sources of Recharge to the Coachella Valley Aquifer System, Riverside County, California by : Frank W. diemel
Download or read book An Isotopic Investigation of the Sources of Recharge to the Coachella Valley Aquifer System, Riverside County, California written by Frank W. diemel and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: For stakeholders in the Coachella Valley, the Coachella Valley Aquifer system is the main source of water, and has been under drawdown conditions since 1936. Presently, Coachella Valley water authorities import up to ~225,000 Af/y of Colorado River water to combat continued over-development. In this investigation, stable and radioisotopes of water and carbon in approximately 80 samples of combined spring, surface waters and well waters from the study area are used to contrast and compare a stable water isotope water-budget versus the water-budget of the USGS 1974 "Analog Model Study of the Ground-Water Basin of the Upper Coachella Valley, California". Stable water isotope data (n = 56) demonstrate springs, surface waters, and wells located in the San Jacinto and San Bernardino mountains plot as a Local Meteoric Water Line defined as Î4D = 8.7Îþ18O + 19.4. Hot and warm springs (n = 6) of the Cahuilla Nation in the Palm Canyon watershed define a regional evaporation trendline written as Î4D = 5.2Îþ18O - 21. Stable water isotopes suggest San Gorgonio and Mission Creek subbasins underflow comprise ~72% of the groundwater recharge to the Indio subbasin. Snowmelt runoff from the Whitewater River and Mission Creek watersheds along with mountain front runoff from the flanking watersheds of the San Jacinto and Santa Rosa mountains are other sources of recharge to the Indio subbasin. There is very little mixing of groundwater from the Desert Hot Springs subbasin with the Indio subbasin groundwater. Nested wells located at the Windy Point recharge facility demonstrate shallow wells have stable water isotope values similar to imported Colorado River water, deep wells having stable water isotope values similar to wells and low elevation springs located in the San Gorgonio subbasin, validating underflow as a major source of recharge. Stable water isotope values in mid-depth Windy Point nested wells demonstrate an ~ 40% to 60% imported Colorado River water versus native Whitewater River surface water mixture. Piper diagram analysis of major-ion concentrations demonstrate mixing of imported Colorado River water and Whitewater River surface water in mid-depth Windy Point wells. Chloride versus Sulfate analysis of three mid-depth Windy Point wells show an ~40% to ~60% mixture of imported Colorado River water and Whitewater River surface water validating the stable water isotope observations. There is little to no underflow contribution from the Whitewater River watershed to the Indio subbasin. The Analog Model overstates the Whitewater River watershed groundwater contribution to the Indio subbasin, and understates the Mission Creek groundwater contribution to the Indio subbasin. Wells located At the Windy Point recharge facility Stable water isotopes datum points suggest the groundwater contribution to the Indio subbasin from the San Gorgonio Pass subbasin is ~48%, and Mission Creek subbasin ~24%. Or, approximately 12864 Af/y, and 6336 Af/y, respectively.Îþ18O and Î4D, C14 and Tritium in sample waters suggest recharge to the Coachella Valley Aquifer system occurs mostly as winter precipitation as snow in the watersheds of the flanking Santa Rosa, San Jacinto and San Bernardino mountains; with limited recharge occurring on the Coachella Valley floor. Taken together, stable water isotopes and radioisotopes of sample waters provide water managers and Engineering Geologist inexpensive tools for tracing groundwater recharge and groundwater movement in a compartmentalized aquifer system.
Book Synopsis Investigating Groundwater and Surface Water Interactions Using Novel Isotopes and Geochemical Tracers in the Upper Merced River Basin, Sierra Nevada, California by :
Download or read book Investigating Groundwater and Surface Water Interactions Using Novel Isotopes and Geochemical Tracers in the Upper Merced River Basin, Sierra Nevada, California written by and published by . This book was released on 2008 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt: Groundwater and surface water interactions in mountain catchments occur at much larger scales than previously recognized. Because mountains are "water towers" and provide much of the water needed to adjacent low lands, it is important to understand these interactions to accurately assess water fluxes within a mountain system. This dissertation presents an approach using several environmental tracers to identity source waters, establish groundwater residence times, and identify groundwater discharge locations in the Merced River basin between Yosemite Valley and El Portal. 36Cl and Cl- were used to identify source waters and to characterize their discharge contributions to stream flow in the Upper Merced River. Near-surface water was found to be the largest endmember. Low-Cl- evapotranspired water was second, and high-Cl- was third. Near-surface water was primarily released during snowmelt, but snow was not an obvious endmember. Snow and near-surface water had Cl- concentrations
Book Synopsis Source, Movement, and Age of Ground Water in a Coastal California Aquifer by : John A. Izbicki
Download or read book Source, Movement, and Age of Ground Water in a Coastal California Aquifer written by John A. Izbicki and published by . This book was released on 1996 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Use of Isotopic Data to Evaluate Recharge and Geologic Controls on the Movement of Ground Water in Las Posas Valley, Ventura County, California by : John A. Izbicki
Download or read book Use of Isotopic Data to Evaluate Recharge and Geologic Controls on the Movement of Ground Water in Las Posas Valley, Ventura County, California written by John A. Izbicki and published by . This book was released on 1997 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Tracing Groundwater Movement in the Eastern Livermore Valley, Alameda County, California Using Stable Isotopes, Major Ion Chemistry, and a Line Source Model by : George Richard Rees
Download or read book Tracing Groundwater Movement in the Eastern Livermore Valley, Alameda County, California Using Stable Isotopes, Major Ion Chemistry, and a Line Source Model written by George Richard Rees and published by . This book was released on 1991 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Publications of the Geological Survey by : Geological Survey (U.S.)
Download or read book Publications of the Geological Survey written by Geological Survey (U.S.) and published by . This book was released on 1986 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Using Stable Isotopes to Estimate Groundwater Recharge in a Temperate Zone by : Ciara McConville
Download or read book Using Stable Isotopes to Estimate Groundwater Recharge in a Temperate Zone written by Ciara McConville and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Rare Books, Broadside, Pamphlets... Books Relating to American Revolution... Rare Americana... -Vente À New-York, Le 28 Mars 1917, Heartman's Auction. Com.-pris. : Daniel R. Kennedy by :
Download or read book Rare Books, Broadside, Pamphlets... Books Relating to American Revolution... Rare Americana... -Vente À New-York, Le 28 Mars 1917, Heartman's Auction. Com.-pris. : Daniel R. Kennedy written by and published by . This book was released on 1917 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Using Stable Isotopes to Develop a Regional Hydrogeological Model and Characterize Nitrate Sources in Groundwater by :
Download or read book Using Stable Isotopes to Develop a Regional Hydrogeological Model and Characterize Nitrate Sources in Groundwater written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Semi-arid regions, like the Okanagan Basin of British Columbia, Canada, are often faced with the difficulty of managing limited groundwater and surface water resources while accommodating rapid population growth and increasing land development. In the South Okanagan Basin, a better understanding of groundwater recharge sources, groundwater availability and susceptibility of water supplies to anthropogenic contamination is needed to best direct and protect the regions water resources. The purpose of this study was: (1) to characterize the regional hydrogeological setting of the South Okanagan Basin by establishing an isotopic and geochemical framework that included precipitation and surface waters of the Okanagan Basin and groundwaters of the South Okanagan Basin; and (2) to characterize nitrate contamination and its sources in shallow groundwaters of the Osoyoos area. Stable isotopes of water, nitrate and dissolved oxygen, groundwater chemistry, water levels and enriched tritium, tritium/helium and/or radiocarbon age dating techniques were used. Two provisional local meteoric water lines were established for the Okanagan Basin: & delta2H=6.06 & delta18O31.21 (Osoyoos) and & delta2H=7.03 & delta18O-12.68 (West Kelowna). Surface waters of the Okanagan River system were sources of irrigation water in the South Okanagan Basin valley and irrigation-return flow was the primary source of recharge for shallow groundwaters. Fractured bedrock in highlands east and west of the valley were not a significant source of recharge for shallow valley groundwater, however, may recharge deeper, or basal, valley deposits. As irrigation-return flow controls shallow groundwater dynamics in the valley sediments, groundwater quality is susceptible to anthropogenic contamination. In Osoyoos, nitrate was present in shallow groundwaters at concentrations of up to 24.4 mg/l N as a result of fertilizer nitrogen applied at the soil surface, mostly at orchards. Two agricultural drainage systems in north.
Book Synopsis Light Stable Isotope Systematics of Large-scale Hydrologic Regimes in California and Nevada by : Neil Layton Ingraham
Download or read book Light Stable Isotope Systematics of Large-scale Hydrologic Regimes in California and Nevada written by Neil Layton Ingraham and published by . This book was released on 1988 with total page 388 pages. Available in PDF, EPUB and Kindle. Book excerpt: The systematics of isotopic fractionation provide a basis to explain the geographic variations in the light stable isotopic compositions of meteoric water along its atmospheric low path, and promote an understanding of the regional hydrology as well as the large scale fluxes of meteoric water. Interpretations in this study were based on the stable isotopic compositions of surface and shallow ground waters, as well as precipitation and free water from conifers. Samples were collected along four east-west traverses, beginning at the coast, and oriented parallel to the atmospheric flow path of the meteoric water. Analysis of water distilled from conifers indicates that tree roots do not isotopically fractionate water. An implication of these results is that transpiration returns water to the atmosphere similar in isotopic composition to local ground water. Partially closed systems imply terrestrial recycling of water. Two models were developed to assess the amount of terrestrial recycling of meteoric water across northern and central California. The amount of recycling was estimated to be between 5 and 40%, indicated that some water is recycled and demonstrate that evapotranspiration cannot be considered a strictly consumptive use of water. The isotopic composition of meteoric water is shown to be directly related to the closure of the hydrologic system(s) upwind. A small change in the degree of closure of the hydrologic system may produce substantial changes in the isotopic composition of meteoric water. The isotopic composition of meteoric water thus reflects the interplay of several processes, which must be considered in addition to the average temperature in climate analysis.--Adapted from abstract.
