Article
Geochemistry & Geophysics
Jiri Faimon, Vit Baldik, Eva Krystofova, Jindrich Stelcl, Jiri Rez
Summary: This study summarizes and expands current knowledge about the formation of calcite rafts by analyzing new data from the environment of a technical adit in the Moravian Karst. The study identifies two types of calcite rafts and discusses the key role of CO2 degassing in achieving supersaturation for calcite nucleation and growth.
APPLIED GEOCHEMISTRY
(2022)
Article
Environmental Sciences
A. Maqueda, P. Renard, M. Filipponi
Summary: One critical aspect in modeling groundwater flow in karstic aquifers is estimating conduit size statistics and the connectivity of the karst conduit network. Statistical analysis can be done on data collected by speleologists, but a significant portion of the network is inaccessible, leading to incomplete statistics. This paper proposes using numerical simulation to evaluate the inaccessible areas of a karst conduit network and investigates the evolution of fracture aperture statistics. The results confirm the existence of different phases in the karstification process, leading to a multi-modal distribution of conduit aperture.
ENVIRONMENTAL EARTH SCIENCES
(2023)
Article
Environmental Sciences
Roi Roded, Einat Aharonov, Amos Frumkin, Nurit Weber, Boaz Lazar, Piotr Szymczak
Summary: Karst systems are widely found in carbonate formations and play a crucial role in global water supply. A significant portion of karst formations is likely formed by underground water ascending from depth. The exact mechanism of formation remains unclear. Numerical simulations show that cooling of carbon dioxide-rich geothermal fluids can dissolve and shape large caves on short geological timescales.
COMMUNICATIONS EARTH & ENVIRONMENT
(2023)
Article
Multidisciplinary Sciences
Barbara Ribeiro, Carolina Lima, Sara Emilly Pereira, Raquel Peixoto, Michelle Klautau
Summary: This study examined whether a calcareous sponge can synthesize its skeleton under ocean acidification conditions. The results showed that the sponge was able to synthesize a skeleton even under low pH, suggesting its potential for survival in near-future ocean acidification conditions.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Physical
Jiangfeng Li, Fenghua Chen, Ningjing Song, Baosheng Li, Yurong Ma
Summary: Additives have a strong influence on the dissolution process of calcite {104} planes, with three different types of additives identified based on their effects. The dissolution of calcite displays four modes as additives concentrations change, resulting in different surface structures. The anisotropic dissolution behaviors of calcite are closely related to the concentrations and adsorption features of the additives on the calcite surface.
Article
Geography, Physical
Alexander Klimchouk, David Evans, Sasa Milanovic, Cristian Bittencourt, Mauro Sanchez, F. Carlos Aguirre
Summary: This study in the Antamina area of the Peruvian Andes reveals the formation and development of the current karst system. It highlights the importance of multiple factors, such as geological structure, landscape evolution, and glaciations, in influencing karst development. The findings have implications for understanding the origin and hydrogeology of carbonate-hosted ore deposits in the Peruvian Andes and other regions. The study emphasizes the significance of speleogenetic and evolutionary approaches in conceptualizing groundwater flow in karst terrains and assessing karst-related hazards and risks.
Article
Chemistry, Multidisciplinary
Michael S. Guzman, Jaisree Iyer, Paul Kim, Daniel Kopp, Ziye Dong, Paniz Foroughi, Mimi C. Yung, Richard E. Riman, Yongqin Jiao
Summary: Microbially induced calcium carbonate precipitation (MICP) is an emerging biotechnology that aims to reduce the environmental impact of concrete production. This study explores the mechanisms and conditions of calcium carbonate precipitation through microbial activity and chemical reactions, with the goal of applying it to the manufacture of high-density cement and concrete.
Article
Chemistry, Multidisciplinary
Michael S. Guzman, Jaisree Iyer, Paul Kim, Daniel Kopp, Ziye Dong, Paniz Foroughi, Mimi C. Yung, Richard E. Riman, Yongqin Jiao
Summary: Biocement formed through microbially induced calcium carbonate precipitation (MICP) is a promising biotechnology that aims to reduce the environmental impact of concrete production. This study investigates the microbial, chemical, and thermodynamic factors involved in MICP, and provides important insights for scaling up microbial carbonation of monocalcium silicate to produce high-density cement and concrete.
Article
Geosciences, Multidisciplinary
Ilenia M. D'Angeli, Jo De Waele, Adriano Fiorucci, Bartolomeo Vigna, Stefano M. Bernasconi, Lee J. Florea, Isabella S. Liso, Mario Parise
Summary: Santa Cesarea Terme is an active sulfuric acid speleogenetic system located along the Adriatic coastline in southern Italy, where thermal and acidic waters mix with seawater to dissolve limestone and create caves. The system consists of four caves, with Fetida and Gattulla being the main focus of investigation due to their accessibility throughout the year. Geochemical analysis and stable isotope measurements helped identify the main processes occurring in this complex cave system, characterized by marine and rising acidic waters.
HYDROGEOLOGY JOURNAL
(2021)
Article
Geochemistry & Geophysics
Elisabete Trindade Pedrosa, Cornelius Fischer, Luiz F. G. Morales, Ricarda D. Rohlfs, Andreas Luttge
Summary: Chemical zoning of crystals can significantly affect dissolution rates, with manganese and iron cation substitutions resulting in substantially lower rates. This finding is crucial for the improvement of kinetic geochemical models at the pore scale.
Article
Geography, Physical
Jon Woodhead, Kale Sniderman, John Hellstrom, Rieneke Weij, Claire MacGregor, Bianca Dickson, Russ Drysdale, Mark Delane, David Henke, Lennox Bastian, Alexander Baynes
Summary: The Tamala Limestone in Western Australia is a vast deposit of carbonate aeolianite and is known for its unique syngenetic karstification. New age determinations on speleothem rubble reveal that cave formation has occurred in the region for at least 200,000 years, with the oldest cave formation dating back to around 2 million years ago.
Article
Engineering, Geological
Yara Barakat, Yu-Jun Cui, Nadia Mokni, Pierre Delage, Frederic Bernier
Summary: This study investigates the dissolution of quartz and calcite minerals in Opalinus Clay under different pH conditions. The results show that quartz dissolution occurs significantly at pH higher than 11.5, while calcite dissolution occurs at pH higher than 8.5. The dissolution of quartz is mainly influenced by exposure time, while the dissolution of calcite depends on both exposure time and pH value.
ENGINEERING GEOLOGY
(2022)
Article
Geochemistry & Geophysics
Vaclav Suchy, Katerina Pachnerova Brabcova, Jiri Zacharias, Ivo Svetlik, Lenka Borecka
Summary: The gothic-arch calcite crystals found in the Koneprusy Caves are a specific crystallographic variety of calcite. They likely originated during the late Pleistocene to Holocene epochs, as a result of destructive and constructive processes mediated by bacteria, fungi, or other microorganisms. These crystals formed in a vadose setting with temperatures below 50 degrees C, indicating a geological context of uplift and exposure to meteoric waters seeping from the topographic surface.
Article
Materials Science, Multidisciplinary
Pingli Jiang, Ruiqing Hou, Shijie Zhu, Shaokang Guan
Summary: A CaCO3 coating was developed by hydrothermal treatment to enhance the anti-corrosion property of biodegradable magnesium alloy. The coating showed excellent corrosion protection and a possible transformation during immersion.
Article
Engineering, Geological
Lin Wu, Zhengmeng Hou, Yachen Xie, Zhifeng Luo, Ying Xiong, Long Cheng, Xuning Wu, Qianjun Chen, Liangchao Huang
Summary: In this study, an enhanced thermal-hydraulic-mechanical-chemical (THMC) simulator called CMPSF is presented to analyze the initiation and propagation of supercritical carbon dioxide (scCO2) fracturing in calcite-rich shale. The simulation results show that calcite content and injection temperature affect fracture initiation pressure and rock damage ratio. Calcite dissolution has a minor impact on fracture initiation and propagation at the early stage of scCO2 fracturing.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2023)
Article
Engineering, Civil
Arfan Arshad, Ali Mirchi, Javier Vilcaez, Muhammad Umar Akbar, Kaveh Madani
Summary: High-resolution, continuous groundwater data is crucial for adaptive aquifer management. This study presents a predictive modeling framework that incorporates covariates and existing observations to estimate groundwater level changes. The framework outperforms other methods and provides reliable estimates for unmonitored sites. The study also examines groundwater level changes in different regions and highlights the importance of effective aquifer management.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Lihua Chen, Jie Deng, Wenzhe Yang, Hang Chen
Summary: A new grid-based distributed karst hydrological model (GDKHM) is developed to simulate streamflow in the flood-prone karst area of Southwest China. The results show that the GDKHM performs well in predicting floods and capturing the spatial variability of karst system.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Faruk Gurbuz, Avinash Mudireddy, Ricardo Mantilla, Shaoping Xiao
Summary: Machine learning algorithms have shown better performance in streamflow prediction compared to traditional hydrological models. In this study, researchers proposed a methodology to test and benchmark ML algorithms using artificial data generated by physically-based hydrological models. They found that deep learning algorithms can correctly identify the relationship between streamflow and rainfall in certain conditions, but fail to outperform traditional prediction methods in other scenarios.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Yadong Ji, Jianyu Fu, Bingjun Liu, Zeqin Huang, Xuejin Tan
Summary: This study distinguishes the uncertainty in drought projection into scenario uncertainty, model uncertainty, and internal variability uncertainty. The results show that the estimation of total uncertainty reaches a minimum in the mid-21st century and that model uncertainty is dominant in tropical regions.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Z. R. van Leeuwen, M. J. Klaar, M. W. Smith, L. E. Brown
Summary: This study quantifies the effectiveness of leaky dams in reducing flood peak magnitude using a transfer function noise modelling approach. The results show that leaky dams have a significant but highly variable impact on flood peak magnitude, and managing expectations should consider event size and type.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Zeda Yin, Yasaman Saadati, M. Hadi Amini, Linlong Bian, Beichao Hu
Summary: Combined sewer overflows pose significant threats to public health and the environment, and various strategies have been proposed to mitigate their adverse effects. Smart control strategies have gained traction due to their cost-effectiveness but face challenges in balancing precision and computational efficiency. To address this, we propose exploring machine learning models and the inversion of neural networks for more efficient CSO prediction and optimization.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Qimou Zhang, Jiacong Huang, Jing Zhang, Rui Qian, Zhen Cui, Junfeng Gao
Summary: This study developed a N-cycling model for lowland rural rivers covered by macrophytes and investigated the N imports, exports, and response to sediment dredging. The findings showed a considerable N retention ability in the study river, with significant N imports from connected rivers and surrounding polders. Sediment dredging increased particulate nitrogen resuspension and settling rates, while decreasing ammonia nitrogen release, denitrification, and macrophyte uptake rates.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Xue Li, Yingyin Zhou, Jian Sha, Man Zhang, Zhong-Liang Wang
Summary: High-resolution climate data is crucial for predicting regional climate and water environment changes. In this study, a two-step downscaling method was developed to enhance the spatial resolution of GCM data and improve the accuracy for small basins. The method combined medium-resolution climate data with high-resolution topographic data to capture spatial and temporal details. The downscaled climate data were then used to simulate the impacts of climate change on hydrology and water quality in a small basin. The results demonstrated the effectiveness of the downscaling method for spatially differentiated simulations.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Tongqing Shen, Peng Jiang, Jiahui Zhao, Xuegao Chen, Hui Lin, Bin Yang, Changhai Tan, Ying Zhang, Xinting Fu, Zhongbo Yu
Summary: This study evaluates the long-term interannual dynamics of permafrost distribution and active layer thickness on the Tibetan Plateau, and predicts future degradation trends. The results show that permafrost area has been decreasing and active layer thickness has been increasing, with an accelerated degradation observed in recent decades. This has significant implications for local water cycle processes, water ecology, and water security.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Chi Zhang, Xu Zhang, Qiuhong Tang, Deliang Chen, Jinchuan Huang, Shaohong Wu, Yubo Liu
Summary: Precipitation over the Tibetan Plateau is influenced by systems such as the Asian monsoons, the westerlies, and local circulations. The Indian monsoon, the westerlies, and local circulations are the main systems affecting precipitation over the entire Tibetan Plateau. The East Asian summer monsoon primarily affects the eastern Tibetan Plateau. The Indian monsoon has the greatest influence on precipitation in the southern and central grid cells, while the westerlies have the greatest influence on precipitation in the northern and western grid cells. Local circulations have the strongest influence on the central and eastern grid cells.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Manuel Almeida, Antonio Rodrigues, Pedro Coelho
Summary: This study aimed to improve the accuracy of Total Phosphorus export coefficient models, which are essential for water management. Four different models were applied to 27 agroforestry watersheds in the Mediterranean region. The modeling approach showed significant improvements in predicting the Total Phosphorus diffuse loads.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Yutao Wang, Haojie Yin, Ziyi Wang, Yi Li, Pingping Wang, Longfei Wang
Summary: This study investigated the distribution and transformation of dissolved organic nitrogen (DON) in riverbed sediments impacted by effluent discharge. The authors found that the spectral characteristics of dissolved organic matter (DOM) in surface water and sediment porewater could be used to predict DON variations in riverbed sediments. Random forest and extreme gradient boosting machine learning methods were employed to provide accurate predictions of DON content and properties at different depths. These findings have important implications for wastewater discharge management and river health.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Saba Mirza Alipour, Kolbjorn Engeland, Joao Leal
Summary: This study assesses the uncertainty associated with 100-year flood maps under different scenarios using Monte Carlo simulations. The findings highlight the importance of employing probabilistic approaches for accurate and secure flood maps, with the selection of probability distribution being the primary source of uncertainty in precipitation.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Janine A. de Wit, Marjolein H. J. van Huijgevoort, Jos C. van Dam, Ge A. P. H. van den Eertwegh, Dion van Deijl, Coen J. Ritsema, Ruud P. Bartholomeus
Summary: The study focuses on the hydrological consequences of controlled drainage with subirrigation (CD-SI) on groundwater level, soil moisture content, and soil water potential. The simulations show that CD-SI can improve hydrological conditions for crop growth, but the success depends on subtle differences in geohydrologic characteristics.
JOURNAL OF HYDROLOGY
(2024)
Article
Engineering, Civil
Constantin Seidl, Sarah Ann Wheeler, Declan Page
Summary: Water availability and quality issues will become increasingly important in the future due to climate change impacts. Managed Aquifer Recharge (MAR) is an effective water management tool, but often overlooked. This study analyzes global MAR applications and identifies the key factors for success, providing valuable insights for future design and application.
JOURNAL OF HYDROLOGY
(2024)