Search Results - "Chang, Hung K"

Monitoring river turbidity after a mine tailing dam failure using an empirical model derived from Sentinel-2 imagery by Crioni, Pedro L B, Teramoto, Elias H, Chang, Hung K

“…Sudden failure of a mine tailing dam occurred in the municipality of Brumadinho, Minas Gerais, Brazil, on January 25, 2019. Approximately 12 million cubic…”
Get full text

Regional Groundwater Modeling of the Guarani Aquifer System by Gonçalves, Roger D., Teramoto, Elias H., Chang, Hung K.

“…The Guarani Aquifer System (GAS) is a strategic transboundary aquifer system shared by Brazil, Argentina, Paraguay and Uruguay. This article presents a…”
Get full text

Using GRACE to quantify the depletion of terrestrial water storage in Northeastern Brazil: The Urucuia Aquifer System by Gonçalves, Roger D., Stollberg, Reiner, Weiss, Holger, Chang, Hung K.

“…Covering a plateau area of approximately 125,000 km2, the Urucuia Aquifer System (UAS) represents a national strategic water resource in the drought-stricken…”
Get full text

Metal speciation of the Paraopeba river after the Brumadinho dam failure by Teramoto, Elias H., Gemeiner, Hendryk, Zanatta, Melina B.T., Menegário, Amauri A., Chang, Hung K.

“…On January 25, 2019, a tailings dam at the Córrego do Feijão iron ore mine (Brumadinho, Minas Gerais, southern Brazil) ruptured and released ~12 million m3 of…”
Get full text

Groundwater geochemical evolution in the northern portion of the Guarani Aquifer System (Brazil) and its relationship to diagenetic features by Gastmans, Didier, Chang, Hung K., Hutcheon, Ian

“…The groundwater flow pattern in the northern portion of GAS (Guarani Aquifer System) is characterized by the existence of four regional recharge areas located…”
Get full text

Determination of specific LNAPL volumes in soils having a multimodal pore-size distribution by Alfaro Soto, Miguel A., Lenhard, Robert, Chang, Hung K., van Genuchten, Martinus Th

“…In this paper we present modifications to previously published models for determining the specific volume of non-aqueous phase liquids (LNAPLs) in the…”
Get full text

Mathematical View of Water Table Fluctuations in a Shallow Aquifer in Brazil by Neto, Dagmar C, Chang, Hung K, van Genuchten, Martinus Th

“…Detailed monitoring of the groundwater table can provide important data about both short‐ and long‐term aquifer processes, including information useful for…”
Get full text

Continental degassing of 4He by surficial discharge of deep groundwater by Aggarwal, Pradeep K., Matsumoto, Takuya, Sturchio, Neil C., Chang, Hung K., Gastmans, Didier, Araguas-Araguas, Luis J., Jiang, Wei, Lu, Zheng-Tian, Mueller, Peter, Yokochi, Reika, Purtschert, Roland, Torgersen, Thomas

“…Helium-4 is produced in the Earth’s crust and degassed to the atmosphere. Measurements of 4 He and 81 Kr dating in an aquifer in Brazil suggest that most…”
Get full text

Quasi‐Saturated Layer: Implications for Estimating Recharge and Groundwater Modeling by Gonçalves, Roger D., Teramoto, Elias H., Engelbrecht, Bruno Z., Alfaro Soto, Miguel A., Chang, Hung K., Genuchten, Martinus Th

“…This study presents an extension of the concept of “quasi‐saturation” to a quasi‐saturated layer, defined as the uppermost dynamic portion of the saturated…”
Get full text

Hydrochemistry of the Guarani Aquifer System modulated by mixing with underlying and overlying hydrostratigraphic units by Teramoto, Elias Hideo, Gonçalves, Roger Dias, Chang, Hung K.

“…•Most of the Guarani Aquifer System groundwater recharge comes from Serra Geral Aquier System seepage.•The hydrochemistry and isotopic changes of the GAS are…”
Get full text

Evidence for euphotic zone anoxia during the deposition of Aptian source rocks based on aryl isoprenoids in petroleum, Sergipe–Alagoas Basin, northeastern Brazil by Sousa Júnior, Gustavo R., Santos, Antônia L.S., de Lima, Sidney G., Lopes, José A.D., Reis, Francisco A.M., Santos Neto, Eugênio V., Chang, Hung K.

“…•Identification of isorenieratane in Brazilian oils.•Evidence of anoxia during the deposition of sediments in Sergipe–Alagoas Basin.•Cretaceous paleolakes on…”
Get full text

Groundwater isotope ratios reflect convective and stratiform (paleo)precipitation fractions in Brazil by Chang, Hung K., Gonçalves, Roger D., Aggarwal, Pradeep K., Stradioto, Marcia R., Hespanhol, Emilio C.B., Sturchio, Neil C., Romatschke, Ulrike, Araguas, Luis J.A.

“…•Shallow groundwater isotopic composition reflects global precipitation type.•Isotope signatures in unconfined aquifers reflect South Atlantic Convergence…”
Get full text

Comparisons Between the Diagenesis of Dioctahedral and Trioctahedral Smectite, Brazilian Offshore Basins by Chang, Hung K., Mackenzie, Fred T., Schoonmaker, Jane

“…Abstract Burial diagenetic reactions of di- and trioctahedral clay minerals were compared in Brazilian offshore, basinal sediment sequences of Cretaceous age…”
Get full text