Welcome to the Spring 2002 issue of the GoldSim Newsletter!
Published quarterly, our goal is to provide information
that helps you get the most out of GoldSim. We also
hope that the Newsletter can act as a vehicle to build
connections between users within the GoldSim community.
Each newsletter delivers the latest GoldSim news,
as well as a number of regular items. This includes
a Featured GoldSim Application, tips from the GoldSim
developers, a list of new models added to the GoldSim
Model Library, a list of new GoldSim Knowledge Base
articles, and a description of new features that the
GoldSim Development Team is currently working on.
Each Newsletter is archived on our website so you
can revisit old issues.
Since this newsletter is for you, we encourage you
to send us your comments and contributions. If you
send us a contribution and we use it, we will acknowledge
you in the Newsletter. Send your contributions to
The GoldSim Technology Group
First Release of GoldSim Pro
The GoldSim Technology group has released the first version
of GoldSim Pro. For long-time users of GoldSim, it is important
to know that GoldSim Pro is essentially the same program
as GoldSim except that the contaminant transport features
are now sold separately as the GoldSim CT and GoldSim RT
modules. The GoldSim CT Module includes functionality for
simulation of non-radioactive constituents while the GoldSim
RT Module includes all the features of GoldSim CT plus additional
features for simulation of radionuclides. Check out the
section of the website for a complete description of the
new product line.
First International User Conference is a Success
The first GoldSim International User Conference was held
April 24-26, 2002 in Seattle, Washington, and was highly
successful. Attendees came from 15 countries (the United
States, Canada, United Kingdom, Sweden, France, Germany,
Spain, Hungary, South Africa, Japan, Taiwan, Australia,
Peru, Brazil, and Chile), reflecting the geographic diversity
of GoldSim's user base. The conference included 26 presentations,
covering topics such as business dynamics, portfolio analysis,
radioactive waste management, mining applications, and infrastructure
modeling. In addition to meeting other GoldSim users from
around the world, attendees learned about future directions
for GoldSim and took advantage of the opportunity to provide
feedback regarding features and capabilities they would
like to see added to the software.
A Simple Water/Mass Balance of a Septage Disposal System
in Western Colorado
Dave Hoekstra, P.E.
Denver, Colorado USA
This quarter's featured application is an excellent example
of the use of GoldSim for water and mass balance calculations
for engineered systems. This particular model simulates
the accumulation of solids and liquids in a series of settling
and evaporation ponds designed to dry septage waste prior
to disposal in a municipal solid waste landfill. Using stochastic
climatic data, known physical properties and pond geometry,
as well as forecast intake rates for the waste, the model
determines the amount of materials entering the system and
reports the fraction of the system's capacity that is required.
The model is small enough to understand easily, while demonstrating
several techniques for computing water balances in GoldSim.
Did you know that you can move the input and output ports
(the red or green triangles between which the influence
arrows are drawn) on an element? To do so, simply select
the element, and press Ctrl+Sht+O to move the output port
to different positions, or Ctrl+Sht+I to move the input
port to different positions. On a related note, one of the
features we plan to implement in the near future is an option
for the influence arrows to be drawn from element center
to element center, rather than between ports.
The GoldSim Model Library allows GoldSim users to build
on the experience and knowledge of others by sharing models.
The Library is available from within the GoldSim Resource
Within the last several months, we have added a number
of new models. Special thanks to Glen Fergus of the Brisbane,
Australia office of Golder Associates. Glen contributed
three excellent water balance building block models: a watershed
yield (runoff) model, a storage element (reservoir) with
a Puls-routed spillway (in which overflow is routed through
the spillway according to its width and discharge coefficient),
and a storage element (reservoir) with an unrouted spillway
(in which the spillway behaves as if it is infinitely wide).
The models are very well documented, and are quite impressive.
If you are building water balance models, we strongly recommend
that you check these out.
We have also added a wide variety of other models, including
several financial applications (e.g., random walk investment
model) and a queuing model. If you have a model that you
think would be worthwhile to post to the library, please
send it, along with text describing the model, to email@example.com.
The GoldSim Knowledge Base contains articles addressing
frequently asked questions, workarounds for known problems,
and advice on applying GoldSim. The Knowledge Base is available
from within the GoldSim Resource Center (GRC).
In the past several months, we have added articles addressing
installation issues (e.g., installing parallel versions,
transferring licenses between machines), file incompatibilities,
and workarounds for several known problems.
We encourage you to visit the Knowledge Base, as even expert
users are likely to find useful information there.
As most users are aware, we are constantly adding new
features to GoldSim, based on feedback from our own modelers,
as well as those of our clients, partners and customers.
In addition to the many minor improvements that we continuously
make to the software, we are currently working on the following
On-line Help and Tutorials: On-line Help will essentially
allow users to access almost all of the content in the
user manual using the help menu within the software.
This means you can find information without searching
through either the online or printed version of the
user manuals. The second addition will be an on-line
tutorial that can be accessed from within the software.
The material in the tutorial will be oriented towards
the first time user and will hopefully make it easier
to climb the GoldSim learning curve (or refresh your
skills if you're an experienced user). We expect to
release an interim release with both the On-line Help
and Tutorial during the early part of Summer 2002.
Replication Module: This module will represent our
first step toward integrating GoldSim with geographic
information systems (GIS). Such a linkage would enable
a user to combine the spatial modeling tools of a GIS
with the dynamic modeling capabilities of GoldSim. In
this first step, we will allow a user to define template
models (sub-models in containers) that GoldSim automatically
replicates across a user-specified grid. The template
models will be defined such that the replicated containers
will be able to communicate between grid cells (e.g.,
a model could reference an output from adjacent grid
cells). We hope to release this module in the summer
We received many excellent ideas from users during the
user conference. We have recently sent out an email with
a link to GoldSim Enhancement Survey that we hope will help
us prioritize which enhancements to focus on. Click
here if you haven't had an opportunity to fill out the
survey and you want to make sure your voice is heard!