SPatial And Time Series Information Modelling (SPATSIM) Thokozani Mbhele Model developed by D Hughes

Introduction SPATSIM is a system that makes use of shapefiles for storing spatial data and database tables for storing other data The information required for water resource assessments is extensive and diverse. To be able to use the information effectively, efficient access, display and analysis tools are required.

SPatial And Time Series Information Modelling (SPATSIM) What can SPATSIM do link spatial data with many other forms of data (including time series). import/export data from/to a variety of different raw data formats. efficient access to information. editing and displaying information. allows for the generation and storage of secondary information created within the system. able to develop links to a wide variety of analysis methods, specifically hydrological and water resource models.

Software Design Overview Developed with Delphi using ESRI MapObjects Spatial data (polygons, points or lines) accessed through shape files Linked using four Data Dictionaries Other data (numbers, text, matrices, graphics time series, etc.) accessed through database tables

Other Internal Utilities Monthly & Annual Duration Curves Generate duration curve data from time series data. High & Low Flow Frequency Data Analyse time series data for a set of standard extreme values. Rendering (spatial visualisation) using single integer or real numbers.

Group rendering using integer number data representing a region type. Value rendering using real number data representing mean annual runoff

External Utilities Generic Time Series Display and Analysis Program Allows multiple time series to be displayed and further analysed. Generic Linking Approach to a Large Number of Model Programs Select spatial element(s) to be modelled. Select model and define model data requirements. Save model setup and run model.

Model requirements defined by a simple text file. These can be input data as well as destinations for data to be saved after the model run has been completed. Associate database information with model requirements

‘Models’ Currently Linked to SPATSIM Monthly rainfall-runoff and reservoir simulation model (Pitman model). Daily rainfall-runoff and reservoir simulation model (VTI model). Streamflow patching and extrapolation model. Several models developed to support the determination of environmental instream flow requirements for rivers. Hydraulic calibration model for river X-sections.

Conclusions SPATSIM is still under development but it is also being used. For many environmental flow requirement studies in South Africa For a rainfall-runoff modelling study in Zambia The basic design has been demonstrated to be robust and flexible. New features can be added quickly New external processes can be added without changing the main code. It appears to be well suited to regional water resource assessment problems.