Scholarlink

Abstract <p>This study hypothesized that estimating van Genuchten equation parameters using Hydrus-1D, with matric potential data (from tensiometry) and moisture data (from gravimetry and FDR probe), yields soil-water retention curves (SWRC) more consistent with field conditions compared to laboratory methods. The objective was to obtain and compare van Genuchten parameters from Hydrus-1D and laboratory methods. For this, an instantaneous profile experiment was conducted in Fortaleza/CE, Brazil, using four plots (1.5 × 2.0 × 0.5&#xa0;m) in a loamy sand Entisol. Each plot had an FDR probe access tube (Diviner 2000) and tensiometers (Hg manometer) at depths of 0.2 and 0.4&#xa0;m. For gravimetric determinations, soil samples were collected at 0.20 and 0.40&#xa0;m depths concomitantly with tensiometer and FDR readings, and the mass-based water content was converted into volumetric water content using bulk density. When the variation in soil moisture over time reached a threshold drainage rate of ∂θ/∂t = 0.01&#xa0;cm³ cm⁻³ d⁻¹, disturbed and undisturbed samples were collected for lab analysis of bulk density, particle density, porosity, and SWRC, fitted to the van Genuchten model (m = 1 − [1/n]). Hydrus-1D estimated four van Genuchten parameters, followed by ANOVA, MANOVA, PCA, and cluster analysis in SAS. Model performance was assessed via efficiency coefficient and RMSE. Results showed that inverse modeling with Hydrus-1D using gravimetry and FDR data yields SWRC better representing field conditions, with FDR probes proving practical and effective for SWRC estimation.</p> Highlights <p><UnorderedList Mark="Bullet"> <ItemContent> <p>Hydrus-1D with gravimetry and FDR produced SWRCs consistent with field-derived curves.</p> </ItemContent> <ItemContent> <p>FDR probes matched gravimetry performance while reducing labor and time requirements.</p> </ItemContent> <ItemContent> <p>Tensiometry captured wet-range dynamics but was less accurate than gravimetry and FDR.</p> </ItemContent> <ItemContent> <p>Laboratory-derived curves showed the weakest agreement with field dynamics.</p> </ItemContent> <ItemContent> <p>ANOVA, MANOVA, PCA, and cluster analysis confirmed FDR–gravimetry equivalence.</p> </ItemContent> </UnorderedList></p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Frequency domain reflectometry and Hydrus-1D for parameterizing the van Genuchten equation in a sandy entisol

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年10月13日

查看全文
  • Ícaro Vasconcelos do Nascimento,
  • Alexandre dos Santos Queiroz,
  • Lucas de Sousa Oliveira,
  • João Marcos Rodrigues dos Santos,
  • Tiago da Costa Dantas Moniz,
  • Raimundo Nonato de Assis Júnior,
  • Helon Hébano de Freitas Sousa,
  • José Carlos de Araújo,
  • Carlos Tadeu dos Santos Dias,
  • Cillas Pollicarto da Silva,
  • Márcio Godofredo Rocha Lobato,
  • Jaedson Cláudio Anunciato Mota

摘要

Abstract

This study hypothesized that estimating van Genuchten equation parameters using Hydrus-1D, with matric potential data (from tensiometry) and moisture data (from gravimetry and FDR probe), yields soil-water retention curves (SWRC) more consistent with field conditions compared to laboratory methods. The objective was to obtain and compare van Genuchten parameters from Hydrus-1D and laboratory methods. For this, an instantaneous profile experiment was conducted in Fortaleza/CE, Brazil, using four plots (1.5 × 2.0 × 0.5 m) in a loamy sand Entisol. Each plot had an FDR probe access tube (Diviner 2000) and tensiometers (Hg manometer) at depths of 0.2 and 0.4 m. For gravimetric determinations, soil samples were collected at 0.20 and 0.40 m depths concomitantly with tensiometer and FDR readings, and the mass-based water content was converted into volumetric water content using bulk density. When the variation in soil moisture over time reached a threshold drainage rate of ∂θ/∂t = 0.01 cm³ cm⁻³ d⁻¹, disturbed and undisturbed samples were collected for lab analysis of bulk density, particle density, porosity, and SWRC, fitted to the van Genuchten model (m = 1 − [1/n]). Hydrus-1D estimated four van Genuchten parameters, followed by ANOVA, MANOVA, PCA, and cluster analysis in SAS. Model performance was assessed via efficiency coefficient and RMSE. Results showed that inverse modeling with Hydrus-1D using gravimetry and FDR data yields SWRC better representing field conditions, with FDR probes proving practical and effective for SWRC estimation.

Highlights

Hydrus-1D with gravimetry and FDR produced SWRCs consistent with field-derived curves.

FDR probes matched gravimetry performance while reducing labor and time requirements.

Tensiometry captured wet-range dynamics but was less accurate than gravimetry and FDR.

Laboratory-derived curves showed the weakest agreement with field dynamics.

ANOVA, MANOVA, PCA, and cluster analysis confirmed FDR–gravimetry equivalence.