Vadose Zone Journal最新文献

Soil water content estimation by using ground penetrating radar data full waveform inversion with grey wolf optimizer algorithm 利用灰狼优化算法，利用地面穿透雷达数据全波形反演估算土壤含水量

IF 2.8 3区地球科学

Vadose Zone Journal Pub Date : 2024-09-13 DOI: 10.1002/vzj2.20379

M. H. Zhang, X. Feng, M. Bano, C. Liu, Q. Liu, X. Wang

{"title":"Soil water content estimation by using ground penetrating radar data full waveform inversion with grey wolf optimizer algorithm","authors":"M. H. Zhang, X. Feng, M. Bano, C. Liu, Q. Liu, X. Wang","doi":"10.1002/vzj2.20379","DOIUrl":"https://doi.org/10.1002/vzj2.20379","url":null,"abstract":"Soil water content (SWC) estimation is important for many areas including hydrology, agriculture, soil science, and environmental science. Ground penetrating radar (GPR) is a promising geophysical method for SWC estimation. However, at present, most of the studies are based on partial information of GPR, like travel time or amplitude information, to invert the SWC. Full waveform inversion (FWI) can use the information of the entire waveform, which can improve the accuracy of parameter estimation. This study proposes a novel SWC estimation scheme by using the FWI of GPR, optimized by the grey wolf optimizer (GWO) algorithm. The proposed scheme includes a petrophysical relationship to link the SWC with the relative dielectric permittivity, 1D GPR forward modeling, and a GWO optimization algorithm. First, numerical modeling was carried out, and the proposed scheme was applied to both noise‐free and noisy data to verify its applicability. Then, the proposed method was applied to data collected from a field experimental site. These results, derived from both synthetic and real datasets, show that the proposed inversion scheme resulted in a good match between the observed and calculated GPR data. In the numerical modeling, it was observed that the SWC could be inverted accurately, even when noise was present in the data. These demonstrate that the GWO method can be applied for the quantitative interpretation of GPR data. The proposed scheme shows potential for SWC estimation by using GPR full waveform data.","PeriodicalId":23594,"journal":{"name":"Vadose Zone Journal","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142263732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Joint multiscale dynamics in soil–vegetation–atmosphere systems: Multifractal cross‐correlation analysis of arid and semiarid rangelands 土壤-植被-大气系统的联合多尺度动力学：干旱和半干旱牧场的多分形交叉相关分析

IF 2.8 3区地球科学

Vadose Zone Journal Pub Date : 2024-09-04 DOI: 10.1002/vzj2.20374

Ernesto Sanz, Andrés F. Almeida‐Ñaulay, Carlos G. H. Díaz‐Ambrona, Sergio Zubelzu Mínguez, Ana M. Tarquis

{"title":"Joint multiscale dynamics in soil–vegetation–atmosphere systems: Multifractal cross‐correlation analysis of arid and semiarid rangelands","authors":"Ernesto Sanz, Andrés F. Almeida‐Ñaulay, Carlos G. H. Díaz‐Ambrona, Sergio Zubelzu Mínguez, Ana M. Tarquis","doi":"10.1002/vzj2.20374","DOIUrl":"https://doi.org/10.1002/vzj2.20374","url":null,"abstract":"Understanding the dynamics of the soil–vegetation–atmosphere (SVA) system, particularly in arid and semiarid regions, remains challenging due to its intricate and interdependent nature. This system creates problems for rangeland administration, such as insurance and risk management. This paper focuses on the complex interactions within the SVA system, particularly on rangeland ecosystems in Spain's semiarid and arid regions. By employing multifractal detrended cross‐correlation analysis (MFCCA), we explore the joint behavior of key variables, including precipitation (PCP), evapotranspiration (ETP), aridity index (Arid. I.), soil water availability (SWA), biomass (Bio), and normalized difference vegetation index (NDVI). Analyzing a 20‐year data series from Madrid and Almeria provinces, we reveal distinct patterns in the studied variables’ persistence, multifractality, and asymmetry. Notably, the differences in the generalized Hurst exponents ((q)) between Madrid and Almeria for SWA with NDVI, SWA with Bio, and NDVI with Bio underscore distinct interactions in these regions. Moreover, multifractal analyses unveil differences in the complexity of joint variables’ behaviors in the two regions. Almeria exhibits higher multifractality across variables, indicating more complex and variable environmental interactions, likely due to its more arid conditions. These findings suggest that Almeria has more sensitivity to changes, requiring adaptive management strategies, while in Madrid, water availability and related variables play a more dominant role in driving vegetation dynamics. These findings shed light through MFCCA on the nuanced dynamics of rangeland ecosystems in semiarid and arid regions, emphasizing the importance of considering complexity‐based approaches to understand the intricate interplay among key variables in the SVA system.","PeriodicalId":23594,"journal":{"name":"Vadose Zone Journal","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142196387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Soil hydraulic property maps for the contiguous United States at 100‐m resolution and seven depths: Code design and preliminary results 美国毗连地区 100 米分辨率和七个深度的土壤水力特性图：代码设计和初步结果

IF 2.8 3区地球科学

Vadose Zone Journal Pub Date : 2024-09-03 DOI: 10.1002/vzj2.20377

Marcel G. Schaap, Yonggen Zhang, Craig Rasmussen

{"title":"Soil hydraulic property maps for the contiguous United States at 100‐m resolution and seven depths: Code design and preliminary results","authors":"Marcel G. Schaap, Yonggen Zhang, Craig Rasmussen","doi":"10.1002/vzj2.20377","DOIUrl":"https://doi.org/10.1002/vzj2.20377","url":null,"abstract":"Estimates of the van Genuchten (1980, abbreviated as VG) parameters and saturated hydraulic conductivity (Ks) were made for the contiguous United States at a resolution of 100 m and seven soil depths by combining the SoilGrids+ (SG+) soil property maps of Ramcharan et al. with the R3H3 member of the Rosetta3 hierarchical pedotransfer functions (PTFs) of Zhang et al. To this end, we developed multi‐threaded code that significantly speeds up computation (up to a factor 25) depending on the level of parallelism. We verified estimates first by calculating simple summary statistics of estimated basic properties of SG+ with actual measured soil properties for 14,113 pedons in the National Cooperative Soil Survey (NCSS) (2023) labsample database. Next, we computed summary statistics of PTF‐estimated moisture contents for NCSS and SG+ data. The results show estimation errors are dominated by intrinsic errors of the PTF, and that (potentially correctable) systematic errors are present in SG+ soil properties and PTF estimates. The resulting hydraulic property maps contain well over 750 million points for each of the seven layers and show considerable horizontal and depth variation for each VG parameter and Ks, except the VG “n” parameter, which is dominated by values between 1.25 and 1.6. The hydraulic property maps are 99.9% complete, and we demonstrate that plausible profiles and uncertainty information can be generated for virtually each point. The maps are available as two multi‐channel GeoTIFF maps per SG+ layer: one with the five hydraulic parameters and one with the corresponding covariances.","PeriodicalId":23594,"journal":{"name":"Vadose Zone Journal","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142196388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Inverse analysis of soil hydraulic parameters of layered soil profiles using physics‐informed neural networks with unsaturated water flow models 利用物理信息神经网络和非饱和水流模型对层状土壤剖面的土壤水力参数进行反分析

IF 2.8 3区地球科学

Vadose Zone Journal Pub Date : 2024-08-28 DOI: 10.1002/vzj2.20375

Koki Oikawa, Hirotaka Saito

{"title":"Inverse analysis of soil hydraulic parameters of layered soil profiles using physics‐informed neural networks with unsaturated water flow models","authors":"Koki Oikawa, Hirotaka Saito","doi":"10.1002/vzj2.20375","DOIUrl":"https://doi.org/10.1002/vzj2.20375","url":null,"abstract":"Information about the spatial distribution of soil hydraulic parameters is necessary for the accurate prediction of soil water flow and the coupled movement of chemicals and heat at the field scale using a process‐based model. Physics‐informed neural networks (PINNs), which can provide physical constraints in deep learning to obtain a mesh‐free solution, can be used to inversely estimate soil hydraulic parameters from less and noisy training data. Previous studies using PINNs have successfully estimated soil hydraulic parameters for homogeneous soil but estimating such parameters of layered soil profiles where the interface depth and the parameters are unknown still has some difficulties. The objective of this study was to develop PINNs to inversely estimate the distribution of soil hydraulic parameters, such as saturated hydraulic conductivity and α and n of the Mualem–van Genuchten model directly within layered soil profiles by predicting changes in the pressure head from training data based on simulation results at given depths during infiltration. The impact of factors affecting PINNs performance, such as the weights assigned to each component of the loss function, time range used in error computations, and number of samples used to assess the physical constraint, was investigated. By assigning a larger weight to the physical constraint and excluding the earlier stage of infiltration in the loss function, the changes in the pressure head and the three soil hydraulic parameter distributions within the layered soil were successfully estimated. The developed PINNs can be further applied to more complex soils and can be improved.","PeriodicalId":23594,"journal":{"name":"Vadose Zone Journal","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142196386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Quantitative experimental study on the apparent contact angle of unsaturated loess and its application in soil–water characteristics curve modeling 非饱和黄土表观接触角的定量实验研究及其在土壤-水特性曲线建模中的应用

IF 2.8 3区地球科学

Vadose Zone Journal Pub Date : 2024-08-27 DOI: 10.1002/vzj2.20376

Yingpeng Fu, Ling Xu, Hongjian Liao

{"title":"Quantitative experimental study on the apparent contact angle of unsaturated loess and its application in soil–water characteristics curve modeling","authors":"Yingpeng Fu, Ling Xu, Hongjian Liao","doi":"10.1002/vzj2.20376","DOIUrl":"https://doi.org/10.1002/vzj2.20376","url":null,"abstract":"Advancing and receding water contact angles, often denoted as the maximum and minimum apparent water contact angles, are crucial parameters reflecting a soil's water holding capacity. These parameters play an important role in establishing theoretical soil–water characteristic curves (SWCCs) for unsaturated soils. However, pre‐assuming constant advancing and receding contact angles during soil wetting and drying processes may be erroneous due to their close correlations with the water content and void ratio. To address this research gap, systematic laboratory measurements were conducted on a loess with different void ratios and water contents. Apparent water contact angles were acquired using an axisymmetric drop shape analyzer, enabling a comprehensive dataset. Analysis of variance was employed to assess the statistically significant differences between void ratios and water contents. The results reveal a significant increase in the observed water contact angle as the void ratio decreases and a decrease with increasing water content. Although both the void ratio and water content influence the water contact angle, the latter has a more pronounced effect. The relationship between the receding water contact angle and water content/void ratio is observed to be linear. The identification of this linear relationship offers insights into the fitting of the SWCC for loess across varying void ratios. This study serves to enhance theoretical methodologies, particularly in the adaptation of contact angles, thus facilitating the development of more precise SWCC models.","PeriodicalId":23594,"journal":{"name":"Vadose Zone Journal","volume":null,"pages":null},"PeriodicalIF":2.8,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142196390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Frequency domain‐based analytical solutions for one‐dimensional soil water flow in layered soils 基于频域的层状土壤中一维土壤水流动的解析解

IF 2.8 3区地球科学

Vadose Zone Journal Pub Date : 2024-08-14 DOI: 10.1002/vzj2.20372

Jiong Zhu, Yuanyuan Zha, Tian‐Chyi Jim Yeh

引用次数: 0

A generalized van Genuchten model for unsaturated soil hydraulic conductivity 非饱和土壤导水性的广义范根努赫腾模型

IF 2.8 3区地球科学

Vadose Zone Journal Pub Date : 2024-07-30 DOI: 10.1002/vzj2.20369

Asghar Ghorbani, Morteza Sadeghi, Markus Tuller, Wolfgang Durner, Scott B. Jones

引用次数: 0

Analysis of experimental and simulation data of evaporation‐driven isotopic fractionation in unsaturated porous media 非饱和多孔介质中蒸发驱动同位素分馏的实验和模拟数据分析

IF 2.5 3区地球科学

Vadose Zone Journal Pub Date : 2024-07-15 DOI: 10.1002/vzj2.20363

Jana Schneider, Stefanie Kiemle, K. Heck, Y. Rothfuss, I. Braud, Rainer Helmig, J. Vanderborght

{"title":"Analysis of experimental and simulation data of evaporation‐driven isotopic fractionation in unsaturated porous media","authors":"Jana Schneider, Stefanie Kiemle, K. Heck, Y. Rothfuss, I. Braud, Rainer Helmig, J. Vanderborght","doi":"10.1002/vzj2.20363","DOIUrl":"https://doi.org/10.1002/vzj2.20363","url":null,"abstract":"Stable water isotopologs can add valuable information to the understanding of evaporation processes. The identification of the evaporation front from isotopolog concentration depth profiles under very dry soil conditions is of particular interest. We compared two different models that describe isotopolog transport in a drying unsaturated porous medium: SiSPAT‐Isotope and DuMux. In DuMux, the medium can dry out completely whereas in SiSPAT‐Isotope, drying is limited to the residual water saturation. We evaluated the impact of residual water saturation on simulated isotopic concentration. For a low residual water saturation, both models simulated similar isotopolog concentrations. For high residual water saturation, SiSPAT‐Isotope simulated considerably lower concentrations than DuMux. This is attributed to the buffering of changes in isotopolog concentrations by the residual water in SiSPAT‐Isotope and an additional enrichment due to evaporation of residual water in DuMux. Additionally, we present a comparison between high‐frequency experimental data and model simulations. We found that diffusive transport processes in the laminar boundary layer and in the dried‐out surface soil layer need to be represented correctly to reproduce the observed downward movement of the evaporation front and the associated peak of isotopolog enrichment. Artificially increasing the boundary layer thickness to reproduce a decrease in evaporation rate leads to incorrect simulation of the location of the evaporation front and isotopolog concentration profile.","PeriodicalId":23594,"journal":{"name":"Vadose Zone Journal","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-07-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141648962","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Special Issue: Tribute to Rien van Genuchten, recipient of the 2023 Wolf Prize for Agriculture 特刊：向 2023 年沃尔夫农业奖获得者里安-范吉努赫腾致敬

IF 2.8 3区地球科学

Vadose Zone Journal Pub Date : 2024-07-14 DOI: 10.1002/vzj2.20327

Jan W. Hopmans, Jiří Šimůnek, Binayak P. Mohanty

引用次数: 0

Thanks to Reviewers, Vadose Zone Journal, 2023 感谢审稿人，《地下带期刊》，2023 年

IF 2.8 3区地球科学

Vadose Zone Journal Pub Date : 2024-07-13 DOI: 10.1002/vzj2.20370

引用次数: 0