Academia.edu no longer supports Internet Explorer.
To browse Academia.edu and the wider internet faster and more securely, please take a few seconds to upgrade your browser.
2009
In the borderland region of the desert southwest, human health and the ecosystems upon which humans rely largely depend on the quality, quantity, and distribution of water resources. In the Santa Cruz River Watershed (SCW), located in the Arizona and Sonora, Mexico border region, surface water is scarce and unreliable, and, during much of the year, is composed of effluent from the local wastewater treatment plant. This makes groundwater the preferred and, consequently, primary source for industrial, agricultural, and domestic use. USGS scientists are using an integrative approach, incorporating the expertise of the Geography, Water, Biology, and Geology disciplines to identify risks to water resources in the SCW, and the potential for impacts to riparian ecosystems and ultimately, human health. This includes tracking organic and inorganic contaminants and their effects from sources to sinks in sediment, water, plants, and animals. Existing ground- and surface-water models will be used and modified to assess contaminant and sediment transport. Water quality, sediment, aquatic macro invertebrates, aquatic plants (macrophytes), algae, riparian grasses, fish, and birds will be sampled at five locations along the Santa Cruz River. Field sampling data will be obtained at sites that coincide with historical sampling programs. Site locations include (i.) the Santa Cruz River headwaters (which should be unaffected by downstream contaminant sources), (ii.) a tributary routed through an abandoned mining district, (iii.) a binational tributary that flows though highly urbanized areas, (iv.) effluent from the local wastewater treatment plant, and (v.) the downstream confluence of the first four sources. The Soil and Water Assessment Tool (SWAT) model will be used in combination with field data to identify key sources of contaminants, contributing areas, and transport modes to track their movement to surface waters. These data will be used together to test relationships between sediment and hydrologic parameters, for the purpose of determining functional links. Further, it is planned that estimates of runoff and evapotranspiration resulting from the SWAT model simulations will be used to modify boundary conditions in the groundwater flow model to improve understanding of the effects of human activities on aquifer dynamics and contaminant transport. The SWAT model will then be used to identify critical sub-watersheds where implementing management practices could be most effective to abate pollution. An overview of our study design and preliminary results will be presented.
With the increasing population, urbanization and industry in the arid area of Tecate, there is a concomitant increase in contaminants being introduced into the Tecate River and its aquifer. This contamination is damaging the usable groundwater supply and making local residents and commercial enterprises increasingly dependent on imported water from the Colorado River basin. In this study we apply a suite of chemical and isotopic tracers in order to evaluate groundwater flow and assess contamination trends. Groundwater recharge occurs through mountain-block and mountain-front recharge at higher elevations of the ranges. Groundwater from the unconfined, alluvial aquifer indicates recent recharge and little evolution. The increase in salinity along the flow path is due to interaction with weathering rock-forming silicate minerals and anthropogenic sources such as urban wastewater, residual solids and agricultural runoff from fertilizers, livestock manure and/or septic tanks and latrines. A spatial analysis shows local differences and the impact of the infiltration of imported waters from the Colorado River basin. The general trend of impaired water quality has scarcely been documented in the last decades, but it is expected to continue. Since the groundwater system is highly vulnerable, it is necessary to protect groundwater sources.
Efficient Decision Support Systems - Practice and Challenges in Multidisciplinary Domains
Estimating the Impact on Water Quality under Alternate Land Use Scenarios: A Watershed Level BASINS-SWAT Modeling in West Georgia, United States2011 •
2003 •
Journal of Borderlands Studies
United States‐Mexican border watershed assessment: Modeling nonpoint source pollution in Ambos Nogales2007 •
Journal of Water Management Modeling
Watershed Assessment using an Integrated Modeling Approach2001 •
Journal of the American Water Resources Association
Gis-Based Water Quality Modeling in the Sandusky Watershed, Ohio, Usa2006 •
IEEE Electron Device Letters
A Novel Single Polysilicon EEPROM Cell With a Polyfinger Capacitor2007 •
Studia Sententiarum
Nicholas of Dinkelsbühl and the Sentences at Vienna in the Early Fifteenth Century2015 •
UBAK 6th International Scientific Research Congress - Science and Engineering ( https://akademikiletisim.com/ubak_site/dokumanlar/1_3_Kasim_2019_ubak_fen.pdf )
PATLATMA KAYNAKLI ÇEVRESEL ETKİLERİN DEĞERLENDİRİLMESİ: HATAY İLİ MERKEZ KURUYER KÖYÜ KALKER OCAĞI ÖRNEĞİ2019 •
Clinical & Translational Immunology
Effects of extremely preterm birth on cytokine and chemokine responses induced by T-cell activation during infancy2024 •
Bị tiểu đường thai kỳ nên ăn hoa quả gì tốt nhất
Bị tiểu đường thai kỳ nên ăn hoa quả gì tốt nhất2024 •
Macromolecular Chemistry and Physics
Synthesis of Silicone-Methacrylate Copolymers by ATRP Using a Nickel-Based Supported Catalyst2006 •
2006 •
Christian-Muslim Relations. A Bibliographical History Volume 19. Sub-Saharan Africa and Latin America (1800-1914)
[Book chapter] Francisco J. Herboso España2022 •
2024 •