中国土壤与肥料Issue(12)：49-60,12.DOI:10.11838/sfsc.1673-6257.25156
基于边界层方法估算红壤溶质运移参数及其优化
Solute transport parameter estimation using boundary-layer methods and its optimization in a red soil
摘要
Abstract
The solute transport parameters(hydrodynamic dispersion coefficient D and delay factor R)are key indicators for predicting solute transport and distribution of soil nutrients and other solutes,providing essential guidance for precision irrigation and scientific fertilization.The boundary-layer method using brilliant blue dye tracing offers distinct advantages,such as less time spent,simple application and unique parameter estimation.However,due to the potential hysteresis in brilliant blue transport through soil,its tracing could not accurately reflect the transport characteristics of target ions,leading to some errors in the estimation of soil solute transport parameters using this method.Based on these,the transport behavior of Cl-as a tracer was investigated in a red soil through a breakthrough experiment and a brilliant blue dye experiment with five NaCl concentrations(1,2,3,5,and 10 g/L,denoted as S1,S2,S3,S5,and S10,respectively).The breakthrough curve and the transport characteristics of solute front traced by brilliant blue for Cl-were compared.Moreover,the estimation accuracy of three boundary-layer solutions(quadratic polynomial,cubic polynomial,and exponential boundary-layer solutions)was evaluated,and the boundary-layer was optimized.The results indicated that NaCl concentration significantly influenced Cl-transport,with higher NaCl concentrations facilitating Cl-breakthrough in red soil.Notable discrepancies were observed in the estimated solute transport parameters and Cl-relative concentration(Cr-Cl)profiles between the boundary-layer solutions and exact solution.The relative error of D(RED)and R(RER),as well as the root mean square error(RRMSE)of Cr-Cl profiles were-0.92-0.24,24.73-108.33,and 0.923-1.396,respectively.The hysteresis of brilliant blue in tracing Cl-transport in red soil was identified as the primary source of boundary-layer method errors.Linear optimization significantly improved the accuracy of parameter estimation,with RED of-0.87-6.02,RER of-0.03-2.85,and RRMSE of 0.008-0.967.The optimized exponential boundary-layer solution demonstrated better performance,especially in S5.This study could provide a scientific basis for improving the accuracy of the boundary-layer method in solute transport parameter estimation,as well as for irrigation and fertilization management in agriculture.关键词
溶质穿透曲线/亮蓝/边界层方法/溶质运移参数Key words
breakthrough curve/brilliant blue/boundary-layer method/solute transport parameter引用本文复制引用
高震涛,黄育坤,张卓奇,陈绍民,谭帅..基于边界层方法估算红壤溶质运移参数及其优化[J].中国土壤与肥料,2025,(12):49-60,12.基金项目
国家自然科学基金青年科学基金(52009039) （52009039）
云南省基础研究计划项目(202401AT070325) （202401AT070325）
云南省科技计划项目(202449CE340014) （202449CE340014）
国家级大学生创新创业训练计划项目(202310674056) （202310674056）
昆明理工大学2024年学生课外学术科技创新基金(2024ZK118). （2024ZK118）
