Gis-aided land evaluation and decision-making for regulating urban expansion: A South African case study     

Johannes Hendrik Van der Merwe 《GeoJournal》1997,43(2):135-151

A computerised aid to the land use planning process is demonstrated on the urban edge of Cape Town, South Africa. Multi-criteria analysis is performed in the IDRISI GIS package to evaluate development suitability for four land use categories according to appropriately measured and weighted criteria. The four suitability images are then subjected to multi-objective land allocation to demarcate optimum locations for each land use type. The decision-making process entails execution of seven consecutive steps which are discussed in detail and applied in the case study. Technical decisions are rationalised and results displayed. The paper concludes with a call for the development of applications which can incorporate public participation in this type of decision-making process to ensure the wider acceptance of advanced GIS technology as appropriate technology.  相似文献   

Contrasting fluid flow patterns at the Bufa del Diente contact metamorphic aureole,north-east Mexico: evidence from stable isotopes   总被引：1，自引：1，他引：0  

Wilhelm Heinrich  Radegund Hoffbauer  Hans-Wolfgang Hubberten 《Contributions to Mineralogy and Petrology》1995,119(4):362-376

Impure limestones with interstratified metachert layers were contact metamorphosed and metasomatized by the Bufa del Diente alkali syenite. Massive marbles exhibit mineralogical and stable isotope evidence for limited fluid infiltration, confined to a 17 m wide zone at the contact. Influx of magmatic brines along most metacherts produced up to 4 cm thick wollastonite rims, according to calcite (Cc)+quartz (Qz)= wollastonite (Wo)+CO₂, and were observed at distances of up to 400 m from the contact. The produced CO₂ exsolved as an immiscible low density CO₂-rich fluid. Chert protolith isotope compositions were ¹⁸O (Qz)=27–30%. and ¹⁸O (Cc)=24–27%.. Many wollastonites in infiltrated metacherts have low ¹⁸O ranging from 11–17 and confirm that decarbonation occurred in presence of a magmatic-signatured fluid. Large gradients in ¹⁸O (Wo) across the rims may reach 6 The ¹⁸O of remaining quartz is often lowered to 15–20 whereas caleites largely retained their original compositions. The isotopic reversals of up to 10 between quartz and calcite along with reaction textures demonstrate non-equilibrium between infiltrating fluid in the aquifer and the assemblage calcite+quartz+wollastonite. This is compatible with the assumption of a down-temperature flow of magmatic fluids that occurred exclusively in the remaining quarzite layer. The ¹³C (Cc) and ¹⁸O (Cc) of marble calcites measured perpendicular to two metachert bands reveal significant isotopic alterations along distances of 4.5 cm and 7.5 cm from the wollastonite-marble boundary only into the hanging wall marble, suggesting an advection process caused by a fluid phase which movel upwards. Covariation trends of ¹³C (Cc) and ¹⁸O (Cc) across the alteration front indicate that this fluid was CO₂-rich. Mass balance calculations show that all CO₂-rich fluid produced by the decarbonation reaction was lost into overlying marble. The metachert aquifers did not leak with respect to water-rich fluids.  相似文献   

Wave-power absorption by parallel rows of interacting oscillating bodies     

Johannes Falnes  Kjell Budal 《Applied Ocean Research》1982,4(4):194-207

  相似文献   

Technical note: Comments on ‘added mass and damping of a sphere section in heave’     

Johannes Falnes 《Applied Ocean Research》1984,6(4):229-230

  相似文献   

Einige Ergebnisse der geologischen Landesaufnahme in den Westtiroler Zentralalpen     

Wilhelm Hammer 《International Journal of Earth Sciences》1925,16(2):147-160

Ohne Zusammenfassung  相似文献   

Gedrillte Asteriten im Rosenquarz und Granat     

Wilhelm Maier 《Contributions to Mineralogy and Petrology》1951,2(5):428-431

Ohne Zusammenfassung  相似文献   

Die eigenartigen Verwitterungs- und Landschaftsformen des Dikilitaš-Sandsteines in Nordost-Bulgarien     

Johannes F. Gellert 《International Journal of Earth Sciences》1932,23(3-4):173-178

Ohne Zusammenfassung  相似文献   

V. Morphotektonik und Neogenbuchten in Ost-Bulgarien     

Johannes F. Gellert 《International Journal of Earth Sciences》1930,21(4):209-217

Ohne ZusammenfassungAuf der Hauptversammlung der Geologischen Vereinigung in Frankfurt am 5. I. 30 vorgetragen.  相似文献   

I. Erdöl Ergebnisse der erdölgeologischen Erforschung Nordwestdeutschlands 1932–1947, ein Überblick     

Alfred Bentz  A. Meyer-Gürr  Helmut Fahrion  Walter Rühl  Wilhelm Kehrer  Hermann Deecke  H. Schlüter  Rolf Behrmann  Hans Weber  Herbert Lögters  Oswald Schmidt 《International Journal of Earth Sciences》1948,35(2):167-170

Ohne Zusammenfassung  相似文献   

IV. Stratigraphie Die fazielle Einstufung fossilführender Sedimente     

Hermann Schmidt  Karl Hoffmann  Erich Brand  Wolfgang Schott  Otto Seitz  Johannes Wolburg  Franz Bettenstaedt  F. E. Hecht  Hilmar Schumann  F. Heidorn 《International Journal of Earth Sciences》1948,35(2):175-178

Ohne Zusammenfassung  相似文献