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Assessment of GIS-interpolation techniques for groundwater evaluation : a case study of the Sandveld, Western Cape, South AfricaMunch, Zahn 12 1900 (has links)
Thesis (MSc)--University of Stellenbosch, 2004 / ENGLISH ABSTRACT: The Sandveld, a potato growing area of the Western Cape is subject to significant
groundwater abstraction for both municipal and agriculture purposes. The climate is arid and
sensitive and important ecosystems in the area are showing varying degrees of impact.
Management measures are needed to ensure ongoing sustainable development of the area.
In this study, different interpolation techniques were evaluated to calculate values for
unsampled variables rainfall and groundwater elevation. Local deterministic techniques as
well as geostatistical techniques were used. It was found that geostatistical techniques,
especially with collateral information, such as topography, provided a more accurate result.
For environmental studies of this nature, Kriging is recommended as interpolation technique.
The underlying data will determine the selection of the particular type of Kriging.
Data was extracted from a customized relational database, geoMon, used for data capture,
retrieval, processing and reporting. Ease of data extraction facilitated analysis.
The interpolated grids were applied in two scenarios: Recharge calculations and quantification
as well as a new classification approach according to Resource Directed Measures (RDM).
Management classes were defined based on GIS-derived data. / AFRIKAANSE OPSOMMING: Die Sandveld, ‘n aartappelverbouingsgebied in die Wes-Kaap, ondergaan aansienlike
grondwateronttrekking vir beide munisipale sowel as landbou doeleindes. Die klimaat is dor
en droog en sensitiewe en belangrike ekosisteme in die area ondervind wisselende
impakvlakke. Bestuursmaatreëls word benodig om volhoubare ontwikkeling van die area te
verseker.
In hierdie studie is verskillende interpolasie tegnieke om onbekende waardes vir veranderlikes
gebruik in grondwater evaluasie te bereken, evalueer. Lokale deterministiese tegnieke sowel
as geostatistiese tegnieke is gebruik. Geostatistiese tegnieke, veral gebruik saam met
addisionele inligting soos topografie, bereken meer akkurate resultate. Vir omgewingsstudies
van hierdie aard, word Kriging aanbeveel as interpolasie tegniek. Eienskappe van die
onderliggende data word gebruik om die tipe Kriging aan te dui.
Data is onttrek uit ‘n gebruikersaangepaste databasis, geoMon, wat gebruik is vir
datavaslegging, onttrekking, prosessering en verslaggewing. Die gemak waarmee data
onttrek kon word het analise vergemaklik.
Geïnterpoleerde data is gebruik vir grondwateraanvullingsberekeninge en -kwantifisering
sowel as ‘n nuwe benadering tot klassifikasie volgens hulpbron gerigte maatreëls.
Bestuursklasse gebaseer op GIS-afgeleide data, is gedefinieer.
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The application of the Planning Indicators Model as a tool for measuring the success of the Metropolitan Spatial Development Framework in the Cape Metropolitan AreaLetsie, Moipone (Moipone Amelia Mantsebo) 12 1900 (has links)
Thesis (MA)--University of Stellenbosch, 2004. / ENGLISH ABSTRACT: Recently there has been growing interest in evaluating the performance and outcomes of
spatial planning policies worldwide. In response to this a research was carried out to
evaluate and monitor the effectiveness of spatial planning policies in the Cape
Metropolitan Area (CMA). The Planning Indicators Model (PIM), which consists of a set
of twenty-six indicators, was applied to monitor and measure the extent to which the
Metropolitan Spatial Development Framework (MSDF) has affected land use and
physical development in the CMA.
To achieve the aim of the study, the research was divided into three phases. The first
phase involved a literature review, the second phase involved interviews with planning
officials and lastly, the collection of different thematic datasets required to run the
Planning Indicators Model. The data sets were used to monitor and display spatiotemporal
variations in conformance and performance indices in the form of maps. These
maps were used to identify areas where strengths can be protected and where weaknesses
need to be corrected.
From a set of 26 indicators used for this study only two indicators monitored
conformances (Growth of informal housing townships) over the period 1993 – 1998; the
others simply indicated the present conditions. This means that the rest of the indicators
did not show trends. However, the data are presented in this report as a useful baseline for
future conformance and performance monitoring exercises. The study also revealed that
for the past twelve years the MSDF has been the subject of extensive debate within the
local authorities. Also several indicators seem to overlap and need to be clearly defined,
thus it is recommended that some of these indicators should be combined to avoid
duplication and confusion. Generally, the PIM can assist in making the impact of spatial
planning greater in the CMA. / AFRIKAANSE OPSOMMING: Onlangs is daar wêreldwyd groeiende belangstelling in die prestasies en uitkomstes van
ruimtelike beplannings- beleide. In reaksie daarop is hierdie navorsing gedoen om die
doeltreffendheid van die ruimtelike beplannings- beleide van die Kaapse Metropolitaanse
Gebied (KMG) te evalueer en te monitor. Die Beplannings Aanwysers Model (BAM)
wat bestaan uit ‘n stel van ses-en- twintig aanwysers, is aangewend om te meet tot
hoeverre die Metropolitaanse Ruimtelike Ontwikkelings Raamwerk grondgebruik en
fisiese ontwikkeling in die Kaapse Metropolitaanse Gebied beïnvloed het.
Om die doelwit van hierdie studie te verwesenlik, is die navorsing gedoen in drie fases.
Die eerste fase bestaan uit ‘n oorsig van die literatuur en die tweede fase uit onderhoude
met amptenare verantwoordelik vir beplanning. Die laaste fase beslaan die versameling
van die verskillende tematiese stelle data wat benodig word vir die Beplannings
Aanwysers Model. Die stelle data is gebruik om die ruimtelike- en tydsvariasies in die
konformering- en prestasie indekse te monitor en ten toon te stel in die vorm van kaarte.
Hierdie kaarte is gebruik om die gebiede te identifiseer waar sterkpunte behoue moet bly
en waar swakpunte reggestel moet word.
Uit die stel van 26 aanwysers wat gebruik is vir hierdie studie, het net twee aanwysers
konformering (Die groei van dorpsgebiede met informele behuising) gedurende die
periode 1993 – 1998 gemonitor; die ander het eenvoudig die huidige toestand aangetoon.
Dit beteken dat die ander aanwysers nie tendense aangetoon het nie. Die data word egter
in hierdie verslag weergee as ‘n nuttige basis vir die toekomstige monitor van
konformering en prestasie. Die studie toon ook aan dat daar gedurende die afgelope
twaalf jaar baie deur plaaslike owerhede gedebatteer is oor die Metropolitaanse
Ruimtelike Ontwikkelings Raamwerk. Ook oorvleuel sommige van die aanwysers en
moet hulle meer duidelik omskryf word. Dus word daar aanbeveel dat sommige van die
aanwysers gekombineer moet word om duplikasie en verwarring te voorkom. Oor die
algemeen kan die Beplanning Aanwysers Model help om die impak van ruimtelike
beplanning op die Kaapse Metropolitaanse Gebied te bevorder.
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GIS-based land suitability assessment and allocation decision-making in a degraded rural environmenBreytenbach, Andre 10 1900 (has links)
Thesis (MSc)--University of Stellenbosch, 2006. / ENGLISH ABSTRACT: Rural development problems faced by the impoverished communities in the Transkei, South
Africa, are numerous, and environmental degradation has already taken much of its toll. By
working at a micro-catchment-level both the socio-economic and biophysical appreciation of the
land resources were captured as encapsulated in the concept of resource management domains.
Participatory decision-making allowed functional land use goals and evaluation criteria to be
incorporated into computerised multi-criteria evaluation and multi-objective land use allocation
models in order to reach an idealised or more sustainable land use situation. In the execution of the
decision-making process seven procedural steps were followed, which are discussed in detail and
applied in the case study. Synthesis of the results emphasised the envisaged rural planning
potential of the methods used. / AFRIKAANSE OPSOMMING: In terme van plattelandse ontwikkeling staar talle probleme die behoeftige gemeenskappe van
Transkei, Suid-Afrika, in die gesig en omgewingsdegradering neem ongehinderd sy tol. Deur op ‘n
mikro-opvangsgebied vlak te werk kon beide die sosio-ekonomiese en biofisiese waarde van die
gebied se hulpbronne bepaal word en uitgebeeld word in hulpbron bestuursdomeine. Deur
deelnemende besluitneming is funksionele grondgebruiksdoelwitte en evaluasie kriteria gebruik in
gerekenariseerde meervoudige kriteria evaluering en veeldoelige grondgebruiksaanwysingsmodelle
ten einde die ideale of ‘n meer volhoubare grondgebruik situasie te verkry. Vir die
uitvoering van die besluitnemingsproses is van sewe opeenvolgende stappe gebruik gemaak en die
uitvoering daarvan word in diepte bespreek in hierdie gevallestudie. Sintese van die resultate het
die potensiaal van hierdie beoogde landelike beplanningsmetodes beklemtoon.
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