Article
Geosciences, Multidisciplinary
Jingjing Lin, Rui Ma, Ziyong Sun, Liansong Tang
Summary: This study proposes a framework for assessing the connectivity of fractured aquifers, using Qitaihe area in northeastern China as an example. By using 3-D numerical models and pumping tests, the distribution of hydraulic conductivity (K) in the fractured aquifer was estimated. The minimum hydraulic resistance (MHR) was then calculated based on the optimized K-field to evaluate hydraulic connectivity, and the least resistance paths (LRPs) were identified. The results indicate that connectivity is better in the northeastern and middle parts of the study area compared to the southwestern part, and that aquifer connectivity plays a larger role in controlling preferential flow channels at regional scales rather than local high-K zones.
JOURNAL OF EARTH SCIENCE
(2023)
Article
Engineering, Civil
Linwei Hu, Maike Schnackenberg, Goetz Hornbruch, Klas Lueders, Wolf Tilmann Pfeiffer, Ulrike Werban, Sebastian Bauer
Summary: Gas leakage can impact groundwater flow and media compressibility in subsurface environments. This study demonstrates that changes in hydraulic conductivity and specific storage, determined through pumping tests, can be used to detect the presence of a new gas phase. The experiments conducted at a field site in Germany showed significant changes in these parameters after injection of methane and hydrogen gas phases.
JOURNAL OF HYDROLOGY
(2023)
Article
Geochemistry & Geophysics
Nicolas D. Barbosa, Victoria A. Jimenez Martinez, Nima Gholizadeh Doonechaly, Tobias M. Mueller, Klaus Holliger
Summary: Fractures in the upper crust have a significant impact on fluid flow and pore pressure distribution. Experimental studies show that the hydraulic response of fractures is period and pressure amplitude dependent, likely related to fracture deformation.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Environmental Sciences
Y. Cheng, J. Renner
Summary: Periodic pumping tests offer advantages over conventional tests by using data processing in the frequency domain to characterize subsurface hydraulic parameters. An analytical model has been developed for isolating injection intervals and evaluating hydraulic properties, such as axial interference analysis and injectivity analysis, to narrow down the range of estimated values. Application of the model to field data shows promising results in assessing subsurface features.
WATER RESOURCES RESEARCH
(2021)
Article
Engineering, Petroleum
Shaowen Mao, Prashanth Siddhamshetty, Zhuo Zhang, Wei Yu, Troy Chun, Joseph Sang-Il Kwon, Kan Wu
Summary: This study investigated the impact of proppant pumping schedules on well production in slickwater fracturing. By simulating proppant transport under real pumping schedules and conducting reservoir simulation analysis, it was found that the pumping schedule with 50% of 100-mesh proppants performed the best in terms of well production efficiency.
Article
Engineering, Geological
Shucai Li, Xintong Wang, Zhenhao Xu, Deqiang Mao, Dongdong Pan
Summary: Hydraulic tomography combined with the successive linear estimator algorithm can effectively describe subsurface hydraulic heterogeneity, and responses from pumping tests can improve the reliability of spatial distribution. Transient hydraulic tomography (THT) provides better indications of heterogeneity in karst models than steady-state hydraulic tomography (SSHT), and reliable geological data can enhance the accuracy of estimated hydraulic parameters.
ENGINEERING GEOLOGY
(2021)
Article
Environmental Sciences
Na Feng, Dongdong Liu, Yao Li, Pu Liu
Summary: This study investigated the inorganic nitrogen pools and transformation in the early growing season in karst forestlands. The results showed that ferns had higher NH4+-N, NO3--N, and inorganic N values compared to shrubs. NH4+-N and NO3--N were primarily found at soil depths of 0-5 cm and 5-15 cm, respectively. Soil N-min was higher at 0-5 cm compared to 10-15 cm. Soil hydraulic properties were found to regulate the inorganic N and N-min processes in the karst forest.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Agriculture, Multidisciplinary
Jun Zhang, Hongsong Chen, Zhiyong Fu, Kelin Wang
Summary: The short-term vegetation restoration had a stronger impact on soil nutrients than on soil physical properties. Soil properties following different land-use types were affected by elevation. Nutrients increased more in low-elevation areas, while clay content variation was the main factor controlling saturated hydraulic conductivity (Ks) variation.
AGRICULTURE ECOSYSTEMS & ENVIRONMENT
(2021)
Article
Engineering, Civil
Quan Liu, Rui Hu, Linwei Hu, Yixuan Xing, Pengxiang Qiu, Huichen Yang, Steffen Fischer, Thomas Ptak
Summary: The study modified the inversion framework of thermal tracer tomography to improve the characterization of hydraulic properties in fractured aquifers. Results show that the modified method can efficiently identify fractures connectivity and conduct hydraulic property characterization accurately under different conditions.
JOURNAL OF HYDROLOGY
(2022)
Article
Energy & Fuels
Mouin Almasoodi, Thad Andrews, Curtis Johnston, Ankush Singh, Mark McClure
Summary: Interference tests are used to assess well connectivity in shale reservoirs, informing engineering decisions about well spacing. This paper presents a new approach to interpreting these tests by fitting the initial interference response to the 1D diffusivity equation. By focusing on the initial response, the method is less affected by nonlinearities, time-varying boundary conditions, and uncertainties in flow geometry. The study also investigates the impact of interference on well production and proposes a dimensionless quantity based on fracture conductivity to predict the 'degree of production interference' (DPI). Results show that the classical definition of dimensionless fracture conductivity and the Chow Pressure Group metric have limitations in predicting DPI accurately, leading to the derivation of a new dimensionless interference length that provides a consistent prediction of DPI for linear flow geometry. Field cases from the Anadarko and Delaware Basins are then analyzed using the new method.
GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
(2023)
Article
Thermodynamics
Manojkumar Gudala, Suresh Kumar Govindarajan, Bicheng Yan, Shuyu Sun
Summary: This study proposes an improved mathematical model to investigate the temperature variations and mechanical strain in the Puga geothermal reservoir. It is found that there are low-temperature regions within the fractures, and the number of hydraulic fractures and well patterns significantly influence the rock and fluid properties. The proposed mathematical model can effectively evaluate and predict the changes in the reservoir.
Article
Geochemistry & Geophysics
Zheng Jiang, Tianci Deng, Qian Yin, Lixin He
Summary: This study delves into the permeability of pore-fracture media by analyzing the nonlinear characteristics and flow velocity field distribution of the rough fracture surface.
Article
Water Resources
Christopher J. Neville
Summary: This study explores the distinction between the pressure front displacement pulse and the groundwater displacement during a pumping test in a confined aquifer. The physical interpretation of the expression adopted for the radial distance travelled by the pressure front is discussed. It is found that the expression is consistent with the integrated effect of a continuous sequence of pulses.
HYDROLOGICAL PROCESSES
(2022)
Article
Microbiology
Zuobing Liang, Shaoheng Li, Zhuowei Wang, Rui Li, Zhigang Yang, Jianyao Chen, Lei Gao, Yuchuan Sun
Summary: Little is known about how microbial activity affects the hydraulic properties of karst aquifers. This study conducted microbiological analysis, heat tracer, isotope, and aqueous geochemical analyses to explore the potential impacts of microbial activity on karst aquifer hydraulic properties. The results indicate that microbial activity or the input of anthropogenic acids may affect carbonate dissolution in deep karst aquifers, leading to changes in hydraulic properties. More direct evidence is needed to quantify the effects of microbial activity on carbonate dissolution.
FRONTIERS IN MICROBIOLOGY
(2023)
Article
Engineering, Mechanical
Peng-Fei Yin, Sheng-Qi Yang, Feng Gao, Wen-Ling Tian, Wei Zeng
Summary: Understanding the distribution characteristics of hydraulic fracture networks in shale reservoirs is crucial for optimizing fracturing design and production estimation. By improving the fluid-solid coupling model and studying key factors affecting fracture propagation, a numerical model is established to analyze the distribution characteristics of the fracture network in staged fracturing. The results show that coalescence of interbedding fractures plays a significant role in forming an effective fracture network for shale gas exploitation.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Environmental Sciences
Yiben Cheng, Hongbin Zhan, Wenbin Yang, Wei Feng, Qi Lu, Yunqi Wang, Qunou Jiang, Bin Wang, Mingchang Shi, Tao Wang, Zhiming Xin, Ruifang Hao
Summary: This study focused on the widely replanted Pinus sylvestris var. Mongolica (PSM) in Mu Us Sandy Land (MUSL) and examined the distribution of precipitation, soil moisture, sap flow, and deep soil recharge (DSR) in shallow soil layers. The results showed that the restoration process of PSM changed the precipitation distribution, with some infiltrating downward as DSR and some being stored in the shallow soil. The increase in vegetation led to increased soil water storage (SWS) capacity in the PSM plot. However, the reduction of shallow SWS and DSR in the PSM plot could be detrimental to the long-term development of PSM forest.
INTERNATIONAL SOIL AND WATER CONSERVATION RESEARCH
(2023)
Article
Biochemistry & Molecular Biology
Yunquan Liu, Huimei Shan, Yanyue Pang, Hongbin Zhan, Chunya Zeng
Summary: Iron modified chitosan/coconut shell activated carbon (Fe/CSCC) composite bead was synthesized and characterized for the removal of Cr(VI). The results showed that the adsorption capacity of Cr(VI) increased with the increase of iron loading, contact time, initial concentration, and temperature, but decreased with the increase of pH, mass and volume ratio. The Fe/CSCC exhibited a high removal efficiency of 97.25% at specific conditions. The presence of coexisting ions led to a decrease in adsorption capacity, and Fe/CSCC showed a pseudo-second-order kinetic with a maximum adsorption capacity of 64.49 mg/g. Characterization analysis revealed that electrostatic attraction and complexation played a major role in the adsorption process.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Engineering, Geological
Qinggao Feng, Hongbin Zhan
Summary: An analytical model is established to analyze the two-region flow caused by constant-rate pumping at a partially penetrating well in a leaky confined aquifer. The effects of aquitard storage, wellbore storage, and wellbore skin are considered in the model. Semi-analytical solutions of drawdown are developed by using a linearization procedure combined with Laplace transform and separation of variables. The results show that the drawdowns in the abstraction well and non-Darcy region for the two-region flow model are larger than those for the non-Darcy flow model, and the drawdown in the Darcy region for the two-region flow model is larger than that for the Darcy flow model throughout the pumping duration. Sensitivity analysis reveals that the drawdowns in the abstraction well, non-Darcy region, and Darcy region are most sensitive to the non-Darcy constant n, as well as the well configuration and horizontal hydraulic conductivity of the Darcy region.
INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
(2023)
Article
Plant Sciences
Zhiming Xin, Wei Feng, Hongbin Zhan, Xuying Bai, Wenbin Yang, Yiben Cheng, Xiuqin Wu
Summary: This study examines the ability of Tamarisk plants in the Ulan Buh Desert to absorb atmospheric water vapor. The results show that even with a low annual precipitation of 84 mm, deep soil recharge still occurs at a rate of 5 mm/year. The study also highlights the importance of small precipitation events and the ability of Tamarisk to absorb unsaturated atmospheric vapor.
Article
Water Resources
Mohammad M. Sedghi, Hongbin Zhan
Summary: This paper aims to present a semi-analytical model for simulating the groundwater mound due to recharge from an ephemeral stream of an arbitrary geometric shape. The point-recharge solution is extended to simulate the groundwater mound by approximating the stream by multiple straight segments and integrating the point-recharge solution. The influences on the groundwater mound and sustainable development of the aquifer near the ephemeral stream are analyzed.
ADVANCES IN WATER RESOURCES
(2023)
Article
Biochemistry & Molecular Biology
Huimei Shan, Huinan Mo, Yunquan Liu, Chunya Zeng, Sanxi Peng, Hongbin Zhan
Summary: Graphene oxide chitosan composite (GOCS) is an environmentally friendly composite adsorbent that can adsorb heavy metals, but its efficiency for heavy metal adsorption is often low. Fe-Mn binary oxides (FMBO) have a high removal capacity of As(III), but suffer from poor regeneration. This study proposes a method of doping FMBO into GOCS to obtain a recyclable adsorbent (Fe/Mn-GOCS), which shows a high removal efficiency of As(III) in aqueous solutions. This study provides new insights into the efficient removal of heavy metals from aquatic environments using binary polymer composites modified by binary metal oxides.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2023)
Article
Engineering, Civil
Chong Ma, Hongbin Zhan, Wenguang Shi
Summary: A conceptual model of vertical groundwater flux induced by a rising prescribed head boundary in a two-layer aquifer system is developed and analyzed. The result shows that differences in hydraulic parameters have significant effects on the hydraulic head distribution and vertical mass exchange between the layers.
JOURNAL OF HYDROLOGIC ENGINEERING
(2023)
Article
Water Resources
Chao Zhuang, Hongbin Zhan, Xiangdong Xu, Jinguo Wang, Zhifang Zhou, Zhi Dou
Summary: Low-permeability aquitards are important for protecting confined aquifers in coastal leaky aquifer systems from seawater and anthropogenic contamination. However, the integrity of the aquitard can be compromised by horizontal heterogeneities known as aquitard windows. This study developed an innovative analytical model to describe groundwater flow in coastal leaky aquifer systems with horizontal heterogeneities in hydraulic properties. The model can account for the effects of aquitard windows on tidal wave propagation. Analytical solutions were derived and compared to sandbox experiments, demonstrating the significant impact of high-permeability aquitard windows on tidal wave propagation and the importance of geostatistical inverse modeling for characterizing heterogeneities and locating aquitard windows.
ADVANCES IN WATER RESOURCES
(2023)
Article
Engineering, Geological
Qirui Ke, Changdong Li, Wenmin Yao, Yibo Fan, Hongbin Zhan, Bingchen Li, Xin Zhang
Summary: Due to seasonal variations in groundwater level and reservoir water level, the microstructure of sandstone undergoes changes during the cyclic wetting-drying process, with increasing microporosity and changes in grain, defect, and micropore structures. The pore compositions gradually shift into a bimodal distribution with dominating small-medium pores and large pores. Connected crack networks and fractures develop as the process continues. The correlation between microporosity values evaluated by different techniques is studied, and the evolution mechanisms of sandstone microstructures are discussed.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2023)
Article
Engineering, Civil
Lin Zhang, Yanfeng Liu, Menggui Jin, Xing Liang, Stefan Krause, Uwe Schneidewind, Yiming Li, Hongbin Zhan
Summary: The emissions of greenhouse gases (GHGs) from riparian zones have significant impacts on global GHG balance, climate change, and sustainable development. However, the effects of water-level fluctuations on soil properties, nitrogen transformation, anf GHG emissions in riparian ecosystems during wetting-drying cycles are still unclear.
JOURNAL OF HYDROLOGY
(2023)
Article
Engineering, Environmental
Yi Wu, Lin Zhang, Zhixin Zhang, Jingyun Ling, Shiqi Yang, Jingjing Si, Hongbin Zhan, Wenling Chen
Summary: This article explores the spatial and temporal links between extreme precipitation events and Sunspot Number, El Nino Southern Oscillation, Arctic Oscillation, and Pacific Decadal Oscillation in the Yangtze River Economic Belt. The research findings show an upward trend in extreme precipitation indices, except for consecutive dry days and consecutive wet days. The study also reveals that the different factors have varying effects on extreme precipitation events during different time periods.
STOCHASTIC ENVIRONMENTAL RESEARCH AND RISK ASSESSMENT
(2023)
Article
Environmental Sciences
Wenguang Shi, Hongbin Zhan, Quanrong Wang, Xianjun Xie
Summary: A novel two-dimensional closed-form analytical solution for heat transport with vertical and nonvertical flow components was presented for the first time using Green's function method in this study. The new model was tested using field data and showed significant impact of nonvertical flow component on heat transport in streambed.
WATER RESOURCES RESEARCH
(2023)
Article
Environmental Sciences
Zehao Chen, Hongbin Zhan
Summary: This study investigates how transport properties affect contaminant transport in a multi-layer porous media system through high-resolution finite-element numerical models. The results show that porosity and retardation factor have similar impacts on the mass flux across layer interfaces, while increasing the transverse dispersivity enhances the mass flux between layers. The study has important implications for managing contaminant remediation in layered aquifers.
Article
Plant Sciences
Yujie Yan, Zhiming Xin, Xuying Bai, Hongbin Zhan, Jiaju Xi, Jin Xie, Yiben Cheng
Summary: Studying the dynamic changes in vegetation coverage on the Mongolian Plateau can help evaluate the ecological environmental quality in East Asia. Using Landsat remote sensing images from 2000 to 2019, this study extracted yearly NDVI data and analyzed the spatiotemporal characteristics of NDVI before and after the establishment of nature reserves. The results showed an improvement in vegetation due to increased precipitation and positive human activities, and the overall trend of NDVI is expected to be stable with a slight decrease in the future.
Article
Geosciences, Multidisciplinary
Wenguang Shi, Quanrong Wang, Hongbin Zhan, Renjie Zhou, Haitao Yan
Summary: In this study, a physically based new model and its associated analytical solutions in the Laplace domain were developed to interpret reactive transport in subsurface systems. The model performed better than previous models in interpreting experimental data. Sensitivity analysis demonstrated that the model is sensitive to mobile porosity and wellbore volume.
HYDROLOGY AND EARTH SYSTEM SCIENCES
(2023)