Hyungjoon Chang

Chungbuk National University

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Pradeep Aggarwal

All India Institute of Medical Sciences Rishikesh

Didier Gastmans

Universidade Estadual Paulista (Unesp)

Yi Zheng

Southern University of Science and Technology

P. Klaus

Marisol Manzano

Universidad Politécnica de Cartagena

Zheng‐Tian Lu

University of Science and Technology of China

Riccardo Hirata

Takuya Matsumoto

International Atomic Energy Agency

Luis Vives

Consejo Nacional de Investigaciones Científicas y Técnicas

Zan Sun

Alibaba Group (China)

Cooperative Institutions

Southern University of Science and Technology

International Atomic Energy Agency

Peking University

Beijing Institute of Water

Chinese Academy of Sciences

Chungbuk National University

Universidade Estadual Paulista (Unesp)

Universitat Politècnica de Catalunya

University of Science and Technology of China

Hefei National Center for Physical Sciences at Nanoscale

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Role of Isotopes in the Development of a General Hydrogeological Conceptual Model of the Guarani Aquifer System (Gas)

Hyungjoon Chang Didier Gastmans Ramón Aravena Riccardo Hirata Marisol Manzano

The Guarani Aquifer System (GAS) is one of the most important groundwater reservoirs in South America, and it represents a typical example of a large transboundary aquifer, shared by Argentina, Brazil, Paraguay and Uruguay. Groundwater flow shows a regional trend from north to south, controlled by the topography and regional hydraulic gradients. Recharge occurs in outcrop areas, mainly in the northern and eastern borders of the GAS. Discharge zones were identified in the southern and western borders. Four main hydrodynamic domains are recognized, related to the major tectonic structures of the Parana Basin. The spatial distribution and the large range of stable isotope contents of groundwater in the confined part of the GAS indicate that recharge has occurred under different climatic conditions. Carbon-14 contents above the detection limit are only found along a narrow band parallel to the outcrop areas, indicating the existence of very old groundwaters in the central portion of the aquifer. (author)

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Citations (6)

Using 81 Kr-age of groundwater in the Guarani Aquifer, Brazil, to constrain estimates of continental degassing flux of 4 He

AGU Fall Meeting Abstracts (2013)

Pradeep Aggarwal Takuya Matsumoto Neil C. Sturchio Hyungjoon Chang Didier Gastmans

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Application of GRACE Data for Quantifying Mesoscale Groundwater Stress - Urucuia Aquifer System, Northeastern Brazil

2015 AGU Fall Meeting (2015)

Reiner Stollberg Roger Dias Gonçalves H. Weiß Hyungjoon Chang

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An Integrated Modeling Approach to Study the Surface Water-Groundwater Interactions and Influence of Temporal Damping Effects on the Hydrological Cycle in the Miho Catchment in South Korea

Water (2018)

Jaewon Joo Yong Tian Chunmiao Zheng Yi Zheng Zan Sun

Integrated surface water–groundwater (SW–GW) models could be used to assess the impacts of climate change or variability on the hydrological cycle. However, the damping effects of the hydrological system have rarely been explored via integrated SW–GW modeling. This paper presents an integrated modeling study in a typical humid area, the Miho catchment in Korea, using an integrated model called Groundwater and Surface-water FLOW (GSFLOW). The major findings of this study are as follows: (1) The simulated results from 2005 to 2014 indicate that the temporal variability in the streamflow, stream-groundwater interactions and groundwater recharge are dominated by the precipitation, while the temporal variability in the evapotranspiration (ET) is controlled by the energy conditions; (2) Damping effects can affect the hydrological cycle across different temporal and spatial scales. At the catchment scale, the soil zone and aquifer play a dominant role in damping the precipitation on monthly and annual time scales, respectively; (3) Variability in the capacity to buffer earlier precipitation is found at small spatial scales, such as streams, and larger spatial scales, such as the whole catchment. This variability could affect the water balance at larger spatial scales and affect the hydrography recession at smaller spatial scales.

Water cycle

Water balance

Temporal scales

Hydrological modelling

10.3390/w10111529

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Laboratory Analysis of Debris Flow Characteristics and Berm Performance

Water (2021)

Kukhyun Ryou Hyungjoon Chang Hojin Lee

In this study, laboratory tests were used to determine the deposition characteristics (runout distance, lateral width, and deposition area) of debris flow and their relationships with the flow characteristics (flow velocity and flow depth) according to the presence of a berm. An experimental flume 1.3 to 1.9 m long, 0.15 m wide, and 0.3 m high was employed to investigate the effects of channel slope and volumetric concentration of sediment with and without the berm. The runout distance (0.201–1.423 m), lateral width (0.045–0.519 m), and deposition area (0.008–0.519 m2) increased as the channel slope increased and as the volumetric concentration of sediment decreased. These quantities also increased with the flow velocity and flow depth. In addition, the maximum reductions in the runout distance, lateral width, and deposition area were 69.1%, 65.9%, and 93%, respectively, upon berm installation. The results of this study illustrate general debris flow characteristics according to berm installation; the reported relationship magnitudes are specific to the experimental conditions described herein. However, the results of this study contribute to the design of site-specific berms in the future by providing data describing the utility and function of berms in mitigating debris flow.

Berm

Flume

Debris flow

Deposition

Tailwater

10.3390/w13162223

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Citations (4)