hydrus说明书部分中文版

2021年3月1日发(作者：specifications)

This tutorial considers water flow and solute transport in a simple three-dimensional

transport domain. The transport domain is a relatively simple hexahedral domain with

a slope in the X-direction. Dimensions of the transport domain are 1000 * 250 *

200cm and there is a groundwater 100 cm below the soil surface. There is a source of

water and contaminant at the soil surface. The problem is divided into two parts. In

the first part, the geometry of the transport domain and its discretization is defined

and initial and boundary conditions are specified.

In the second part, final pressure

head profile from the first run is imported as an initial condition, and pulse of solute is

added into the surface source.

The example thus again demonstrates how results of a

previous simulation can be used in follow-up calculations with different boundary

conditions or having additional features. Users will learn how to define a simple

threedimensional transport domain and how to use Sections when defining initial and

boundary conditions. Users will also learn various ways of viewing transport domain

and simulation results.

本教程认为在一个简单立体交通领域的水 流，传送域是一个在

X

方向有斜角的相

对简单的六面体，

传送域的尺寸是

1000* 250 *20 0

厘米，

100

厘米以下的土壤表面< /p>

有一个地下水。

问题被分为两个部分，

在 第一个方面，

传送域及其离散化的几何

形状被确定，初始条件和 边界条件被指定。

这样的例子再次证明了先前模

拟的结果如何被应用于后续计算不同的边界条件，

或具有其他的附加 功能。

用户

将学习如何定义一个简单的三维传输域，

< p>
以及如何使用章节定义初始条件和边界

条件。用户也将学习各种方式查看运 输域和仿真结果。

时间信息

Time Units

Time units [T] to be used throughout the application (days, hours,

min, sec). When units are changed during or after data entry, then

all input variables are converted automatically into the new units.

时间单位可以在整个应用程序中使用（天，小时，分钟 等等）。

当在数据输入以后时间单位改变，那么所有输入的将自动转化

< br>为新的时间单位。

Initial Time

Starting time [T] of the calculation.

计算起始时间。

Final Time

Final time [T] of the calculation.

计算最终时间。

Initial Time Step

Initial time increment,

dt

[T]. The initial time step should be a

function of the type of problem being solved. Problems with high

pressure gradients (e.g., infiltration into an initially dry soil) and

for soils with highly nonlinear soil hydraulic properties require

relatively small initial time steps. The initial time step is used at the

beginning of the simulation or whenever boundary conditions are

substantially changed (e.g., the water flux changes by 25% or

more).

初始时间增量。初始时间步长应该是一个解决问题的功能。高

压力梯度问题（例如渗入干燥的土壤）和具有高度非线性的土

壤 水力特性需要相对小的初始时间步长。初始时间步长在模拟

开始或者边界条件具有实质上 的改变的时候被应用。（例如水

流量改变了

25%

或者更多）。

Minimum Time Step

Minimum permitted value of the time increment,

dt

min

[T]. The

minimum time step must be smaller than a) the initial time step, b)

interval between print times, and c) interval between time- variable

boundary condition records.

时间增量的最小允许值。

最小时间步长必须比以下条件更小：

a

）

初始时间步长，

b

）输出时间间隔，

c

）随时间变化的 边界条件

记录间隔。

Maximum Time Step

Maximum permitted value of the time increment,

dt

max

[T]. The

maximum time step can be a relatively large number (the optimal

time step is selected by the program), unless small time steps are

required, for example, to simulate temperatures during one day.

时间增量的最大允许值 。最大时间步长可以是一个比较大的数

（最佳时间步长由程序选定），除非要求较小的时 间步长，例

如，模拟一天的温度。

边界条件

Time- Variable Boundary Condition -

The number of time-dependent boundary

records and time-dependent boundary conditions must be specified when this box is

checked. The boundary conditions otherwise are assumed to be constant in time. The

GUI can handle only a limited number of time variable data records (around 15,000;

depending on the problem). If a required number of data records is larger than this

number, a user needs to extend the file manually using

the following

procedure

.

< p>
随时间变化的边界条件——选中此框后，

随时间的边界条件记录

< p>
和

随时间变化的

边界条件的数量

< br>必须被指定。否则最后边界条件被假设为常数。

GUI

只 能处理有

限数量的时间变量的数据记录（大概

15000

左右）。如果需要的数据记录数比这

个数据更大，用户需要手动使用下 列程序扩展

程序。

In the

Print Options

part of the dialog window, one decides whether certain

information concerning mean pressure heads and concentrations, mean water and

solute fluxes, cumulative water and solute fluxes, and time and iteration information

is printed at each time step (

T-Level Information

), after

n

time steps (

Every n time

steps

), at a certain defined time interval (

Interval Output

), or if the information is sent

to the screen during the calculations (

Screen Output

). When the simulation ends users

are by default asked to hit the Enter key of the keyboard to return to the GUI from the

computational window. This action can be disabled by unchecking the

Hit Enter at

the End

check box.

在对话框的输出选项对话框，需要决定相关信息是否影响压力水头和浓度均值，

水和溶质通量均值，累积的水和溶质通量

This check box decides whether certain information concerning

T-Level

mean pressure heads and concentrations, mean water and solute

Information

fluxes, cumulative water and solute fluxes, and time and iteration

information, are to be printed at each time step, after

n

time steps, or

only at preselected times (

Print Times

) or

Time Intervals

.

Users can specify whether or not information concerning mean

Interval

pressure heads and concentrations, mean water and solute fluxes,

Output

cumulative water and solute fluxes, and time and iteration

information is to be printed at a regular

Time Interval

.

Check box to decide whether or not information about the

Screen

simulation run is to be printed to the screen during execution of the

Output

HYDRUS computational code. We recommend to check this box

for direct problems, but not for inverse problems.

Print Times

In the

Print Times

part of the dialog window one specifies the

number of Print Times (

Count

) at which detailed information about

the pressure heads, water contents, concentrations, temperatures,

fluxes, and the soil water and solute balances will be printed.

Clicking on the

Default

command button will cause the print times

to be distributed evenly between the initial and final time.

在对话框的

PT

部分，在 压力水头、水容量、浓度、温度、通量

的细节信息里，指定输出时间的数量，土壤睡和固 体的平衡将

会被输出。点击默认按钮将会导致输出时间在初始和最终时间

内被平衡分配。