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首页> 外文学位 >Development, verification, and evaluation of a solute transport model in surface irrigation.
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Development, verification, and evaluation of a solute transport model in surface irrigation.

机译：地表灌溉中溶质运移模型的开发，验证和评估。

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摘要

A cross-section averaged Advection-Dispersion equation (ADE) model was developed to simulate the transport of fertilizer in furrow irrigation, The advection and dispersion processes were solved separately by implementing the method of the characteristics with cubic spline interpolation (and natural boundary condition) and weighted finite difference scheme respectively. A zero-flux boundary condition during advance and an advective gradient at the downstream end of an open furrow were established. Local pseudo-steady state was assumed in order to apply Fischer's longitudinal dispersion equation under non-uniform and unsteady furrow flow conditions. Also, several parameters were used to evaluate the ADE model and fertigation performance.; A field tracer experiment in two types of downstream-end furrow and two treatments was conducted and described. Infiltration and roughness parameters were calibrated by implementing a volume balance approach. The calibrated parameters were used as input data to run the surface irrigation model (SRFR). The roughness coefficient was 0.045 for wheel and 0.055 for non-wheel furrow treatment for bare soil. The root mean square error (RMSE) comparing the computed and observed infiltrated volume was in the range of 0.09--0.38 m3. The close match between simulated and observed data indicates an acceptable calibration. Pulses of fertilizer injected at the head end of four furrows each having unique management characteristics were simulated satisfactorily during the entire duration of the irrigation event. The constant value of the longitudinal dispersion coefficient was 1 m2 min -1 and yielded an acceptable space-time evolution of the pulses of tracer injected. Similar results for the dispersion coefficient were obtained with Fischer's equation in non-uniform and unsteady stream flow conditions in the furrow. An evaluation of several fertigation strategies for furrow systems indicated that fertigation by pulses could help reduce leaching and runoff losses in surface irrigation systems.
机译：建立了横断面平均对流扩散方程（ADE）模型，模拟了沟灌中肥料的运移，通过采用三次样条插值（自然边界条件）特性方法实现对流和离散过程的求解。和加权有限差分方案。建立了提前过程中的零通量边界条件和开沟下游端的对流梯度。为了在不均匀和不稳定的沟流条件下应用菲舍尔的纵向弥散方程，假定了局部拟稳态。同样，几个参数被用来评估ADE模型和施肥性能。在两种下游沟和两种处理方法中进行了田间示踪剂实验并进行了描述。渗透和粗糙度参数通过实施体积平衡方法进行校准。校准后的参数用作运行地表灌溉模型（SRFR）的输入数据。对于裸土，车轮的粗糙度系数为0.045，非车轮犁沟的粗糙度系数为0.055。比较计算和观察到的渗透量的均方根误差（RMSE）在0.09--0.38 m3的范围内。模拟数据和观察数据之间的紧密匹配表明可接受的校准。在整个灌溉过程中，令人满意地模拟了在四个犁沟头端注入的肥料脉冲，每个犁头具有独特的管理特性。纵向弥散系数的恒定值为1 m2 min -1，并产生了注入的示踪剂脉冲的可接受的时空演化。在沟中非均匀和非恒定流条件下，利用费歇尔方程获得的色散系数相似结果。对犁沟系统几种施肥策略的评估表明，脉冲施肥可以帮助减少地表灌溉系统中的淋失和径流损失。

著录项

  • 作者

    Perea-Estrada, Hugo.;

  • 作者单位

    The University of Arizona.;

  • 授予单位 The University of Arizona.;
  • 学科 Engineering Agricultural.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 251 p.
  • 总页数 251
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 农业工程;
  • 关键词

  • 入库时间 2022-08-17 11:42:19

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