Article
Computer Science, Interdisciplinary Applications
Alessandro Comunian, Mauro Giudici
Summary: The Comparison Model Method is a relatively simple and computationally efficient approach for identifying the transmissivity of a confined aquifer, but it suffers from some classical drawbacks related to ill-posedness and ill-conditioning. The effectiveness of the method can be enhanced by introducing a factor to limit negative effects and by casting it in a tomographic framework.
COMPUTERS & GEOSCIENCES
(2021)
Article
Environmental Sciences
Michela Trabucchi, Daniel Fernandez-Garcia, Jesus Carrera
Summary: Understanding groundwater flow and contamination transport requires characterizing aquifer attributes and hydraulic connectivity structures. In evaporitic aquifer systems, karst conduits and fault zones are important preferential flow channels that impact saltwater exploitation. Hydraulic connectivity can enhance inflow of less evaporated brine, improving efficiency. A study using stochastic inversion method showed successful characterization of preferential flow zones in a large evaporitic aquifer, with consistent results from different data sources.
WATER RESOURCES RESEARCH
(2022)
Article
Automation & Control Systems
Vikram Krishnamurthy, George Yin
Summary: This paper introduces a inverse reinforcement learning algorithm for estimating the reward function of optimizing agents by observing noisy estimates of the reward function gradient generated by multiple stochastic gradient agents. The proposed algorithm uses generalized Langevin dynamics to estimate the reward function and kernel-based passive learning schemes, suitable for high-dimensional data, and proves the weak convergence of the algorithm.
JOURNAL OF MACHINE LEARNING RESEARCH
(2021)
Article
Water Resources
Liu Jin-bing, Jiang Si-min, Zhou Nian-qing, Cai Yi, Cheng Lu, Wang Zhi-yuan
Summary: When groundwater pollution occurs, collecting accurate and timely information is crucial for developing an effective remediation plan. Data assimilation and geostatistics are commonly used methods for estimating contaminant source parameters and hydraulic conductivity field, respectively.
JOURNAL OF GROUNDWATER SCIENCE AND ENGINEERING
(2021)
Article
Agronomy
Yang Yang, Yan Zhu, Jingwei Wu, Wei Mao, Ming Ye, Jinzhong Yang
Summary: A new subsurface drainage (SDR) package based on the Hooghoudt equation was developed to accurately simulate the effects of subsurface drainage pipes on groundwater flow and salt dynamics. The accuracy and applicability of SDR were tested through synthetic and field experiments, demonstrating its ability to accurately model leaching water and solute transport. Applied in the Yonglian irrigation area of Inner Mongolia, China, the SDR system increased total salt discharge by 38-54%, with 36-45% discharged by subsurface drainage pipes, providing a pilot example for regional subsurface drainage system design.
AGRICULTURAL WATER MANAGEMENT
(2022)
Article
Engineering, Multidisciplinary
Jing Hu, Qimin Zhang, Anke Meyer-Baese, Ming Ye
Summary: This study introduces a new model to address the increasing prevalence of Alzheimer's disease in today's society, using a stochastic reaction-diffusion approach to calculate the progression of AD and providing conditions for finite-time stability. Furthermore, an optimal control problem is formulated to minimize pathogenic proteins and control costs, with specific examples provided for demonstration.
APPLIED MATHEMATICAL MODELLING
(2022)
Article
Agronomy
Wei Mao, Yan Zhu, Jingwei Wu, Ming Ye, Jinzhong Yang
Summary: This study evaluated the effects of limited irrigation on water movement and salt accumulation in agricultural areas. The results showed that limited irrigation led to a decline in groundwater level, increased soil salt storage, and a threat of soil salinization.
AGRICULTURAL WATER MANAGEMENT
(2022)
Article
Agronomy
Tianxing Zhao, Yan Zhu, Ming Ye, Jinzhong Yang, Biao Jia, Wei Mao, Jingwei Wu
Summary: Accurate estimation of phreatic evapotranspiration (ET) is crucial for water resource management and prevention of soil salinization. This study developed a new approach based on NDVI and measured water table depths to estimate the spatial-temporal distribution of phreatic ET. The results matched well with the groundwater balance model and showed the importance of phreatic ET in supporting crop growth and the ecological environment in arid areas.
AGRICULTURAL WATER MANAGEMENT
(2022)
Article
Environmental Sciences
Ahmed S. Elshall, Ming Ye, Sven A. Kranz, Julie Harrington, Xiaojuan Yang, Yongshan Wan, Mathew Maltrud
Summary: Earth system models are valuable tools for climate services, but their potential for regional environmental management is yet to be fully explored. This article demonstrates the use of high-resolution models to study the Florida Red Tide and establishes a causal link between the position of Loop Current and red tide occurrences. The study highlights the prospects of utilizing publicly available data for regional management and discusses the importance of stakeholder participation in future model development.
ENVIRONMENTAL EARTH SCIENCES
(2022)
Article
Mathematics, Interdisciplinary Applications
Jing Hu, Qimin Zhang, Anke Meyer-Baese, Ming Ye
Summary: In this paper, two classes of mathematical models associated with Alzheimer's disease (AD) are developed, considering reaction-diffusion, delay and random disturbances. The stability of the equilibrium and the Hopf bifurcation in the deterministic AD model are analyzed. The finite-time contractive stability (FTCS) for the stochastic AD model modulated by Markov switching process is investigated, focusing on the influence of uncertain factors in the environment on AD.
INTERNATIONAL JOURNAL OF BIFURCATION AND CHAOS
(2022)
Article
Engineering, Civil
Qi Liu, Heng Dai, Dongwei Gui, Bill X. Hu, Ming Ye, Guanghui Wei, Jingxiu Qin, Jin Zhang
Summary: This study used wavelet analysis to evaluate the effects of flow regimes of ecological water transport projects (EWTP) on ecohydrological system dynamics. The results showed that the restoration flow exhibited seasonal periodicities different from natural streams, leading to distinct groundwater dynamics and mismatched growth rhythm of riparian vegetation. Two designed flow schemes based on time lags between flow and vegetation growth were proposed to optimize the EWTP and improve ecosystem restoration efficiency. The NARX network was used for ecological restoration prediction, showing a significant increase in restoration flow compared to the original flow. The methodologies used in this study are rigorous and applicable to other EWTPs.
JOURNAL OF HYDROLOGY
(2022)
Article
Engineering, Civil
Mengqin Wang, Yan Zhu, Tianxing Zhao, Lihong Cui, Wei Mao, Ming Ye, Jingwei Wu, Jinzhong Yang
Summary: Field experiments were conducted to analyze the non-synchronized movement of soil water and salt during freezing-thawing periods, with a focus on soil salt composition and convection-diffusion theory. The results shed light on the mechanisms underlying soil water and salt dynamics in agricultural systems with shallow groundwater tables.
JOURNAL OF HYDROLOGY
(2022)
Article
Mathematics, Applied
Wenrui Li, Ming Ye, Qimin Zhang, Meyer-Baese Anke, Yan Li
Summary: This paper introduces a periodic averaging method for impulsive stochastic age-structured population models in a polluted environment. It demonstrates the uniqueness of the solutions and the mean-square convergence criteria of numerical solutions, and validates the efficiency of the method through a simulation example.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(2022)
Article
Engineering, Mechanical
Jing Hu, Qimin Zhang, Anke Meyer-Baese, Ming Ye
Summary: In this paper, a stochastic model is proposed to describe the dynamics of substances related to Alzheimer's disease. The theoretical results are validated by numerical simulations.
NONLINEAR DYNAMICS
(2022)
Article
Environmental Sciences
Tian Jiao, Ming Ye, Menggui Jin, Jing Yang
Summary: The Smoothed Particle Hydrodynamics (SPH) method is a Lagrangian approach widely used for solving numerical dispersion problems in groundwater solute transport. To improve accuracy in models with irregular particle distribution, an Interactively Corrected SPH (IC-SPH) method was developed. IC-SPH uses interactively corrected kernel gradients to construct concentration gradients, resulting in more accurate and faster converging solutions.
WATER RESOURCES RESEARCH
(2022)
Article
Mathematics, Applied
Wenjuan Guo, Qimin Zhang, Ming Ye
Summary: This paper develops an age-structured HIV model considering age of infected cells and intracellular delay, and a stochastic age-structured HIV model with Markovian switching to study finite-time contraction stability. Theoretical and numerical results illustrate the impact of noise intensity and delay on stability of the HIV models.
Article
Engineering, Civil
Yan Zhu, Tianxing Zhao, Wei Mao, Ming Ye, Xudong Han, Biao Jia, Jinzhong Yang
Summary: A modified UBMOD flow model was developed to accurately estimate soil water content and water table depth in arid agricultural areas with shallow water table depth. The model incorporates the impact of capillary rise and calculates water table depth using the water table depth fluctuation analysis. The results demonstrated its effectiveness and low computational cost, making it a valuable tool for hydrodynamic studies in areas with shallow water table depths.
JOURNAL OF HYDROLOGY
(2023)
Article
Engineering, Civil
Mengqin Wang, Yan Zhu, Wei Mao, Ming Ye, Jinzhong Yang
Summary: Current research on soil salt movement during the freeze and thaw period has focused mainly on total salt concentration, neglecting the phase change of multi-component salts. This study investigated the potential transport capability of soil water and salt ions in the frozen layer using chemical characteristics and solute convection-diffusion theory. Field experiments were conducted to measure changes in total soil water, soil salt, and its ion components. The results showed different migration directions and quantities of various salt ions due to concentration gradients and diffusion coefficients, with Na+, Cl-, and SO42- exhibiting larger potential convection and dispersion quantities than Ca2+, Mg2+, and HCO3-. This study provides a new perspective on soil salt movement in frozen agricultural areas with shallow groundwater tables.
JOURNAL OF HYDROLOGY
(2023)
Article
Mathematics, Applied
Yanyan Du, Ming Ye, Qimin Zhang
Summary: In this paper, a stochastic population-toxicant model with cross-diffusion is developed and the local boundedness of strong solutions is studied. The existence of a global martingale solution in a Hilbert space is obtained using the Galerkin approximation method, the tightness criterion, and the energy estimation.
APPLIED MATHEMATICS LETTERS
(2023)
