http://dl.gi.de/handle/20.500.12116/23833 2026-07-23T13:24:01Z 2026-07-23T13:24:01Z Downes, Nigel Keith Storch, Harry http://dl.gi.de/handle/20.500.12116/25925 2019-09-16T03:13:38Z 2013-01-01T00:00:00Z

Understanding Urban Structures – An Approach for Assessing Climate Risk in Emerging Megacities Downes, Nigel Keith; Storch, Harry Page, Bernd; Fleischer, Andreas G.; Göbel, Johannes; Wohlgemuth, Volker The emerging megacity of Ho Chi Minh City has developed at breakneck pace. The city has become Vietnam s economic powerhouse and an important hotspot for direct foreign investment in Southeast Asia in a mere few decades. Recently the need to adapt to the multiple stressors of rapid urbanisation and climate change has also become increasingly evident. The city is seen to be particular susceptible to both current and future impacts of climatic change, due to its specific geographic setting, its current development challenges, and its underlying rate of urbanisation. Worryingly, these climate change impacts, if unaddressed, pose significant consequences and present further challenges that will infringe upon the overall urban functioning and liveability of the city as a whole. This contribution will outline an urban structure type approach used to portray, classify and understand settlement patterns and the urban structures of the current and emerging landscapes of Ho Chi Minh City. An important prerequisite for establishing much needed efficient and proactive, as well as rapid, adaptation planning strategies is the spatial and rational characterisation of the current urban fabric according to vulnerability relevant features. Further, an understanding of urban settlement patterns and urban structures allows for the capturing of the highly dynamic spatiotemporal social and structural changes associated with rapid urbanisation processes. The ultimate aim is an integrated assessment of the underlying urban risk divide and the inherent urban resilience based on coherent and credible indicator sets. The approach provides a common spatial framework at the resolution of the urban block for data integration and for the compilation of existing vulnerability concepts from various thematic and scientific disciplines at the same spatial scale. The scale provides a clear instrument to generate portfolios of block-specific core indicators, move across scales, run scenarios and aggregate to larger planning horizons, ultimately useful to determine hotspots for administrative interventions and to assist prioritising in spatial planning decision-making.

2013-01-01T00:00:00Z Haase, Martina http://dl.gi.de/handle/20.500.12116/25920 2019-09-16T03:13:38Z 2013-01-01T00:00:00Z

Development of mathematical models for forecasting hydraulic loads of water and wastewater networks Haase, Martina Page, Bernd; Fleischer, Andreas G.; Göbel, Johannes; Wohlgemuth, Volker In municipal waterworks the operation of water and wastewater networks decides about the functioning of the sewage treatment plant that is the last element of the whole water and sewage system. The both networks are connected each other and the work of the water net affects the operation of the wastewater one. The parameters which are important for right leading of all waterworks objects are their hydraulic loads that have to be not exceeded. Too large loads can cause accidents in the wastewater net or the tratment plant and an early knowledge of them is of importance for undertaking some counteractions. In the paper different algorithms to model hydraulic loads of municipal water and wastewater nets are described and compared regarding their computation velocity and accuracy. Some exemplary computations have been done with some real data received from a Polish water company.

2013-01-01T00:00:00Z Linh, Doan Tuan Long, Trinh Hoang Van, Pham Thanh Manh, Vu Van http://dl.gi.de/handle/20.500.12116/25921 2019-09-16T03:13:38Z 2013-01-01T00:00:00Z

Using Mike 21 ST model to assess the sand mining project in Lo river Linh, Doan Tuan; Long, Trinh Hoang; Van, Pham Thanh; Manh, Vu Van Page, Bernd; Fleischer, Andreas G.; Göbel, Johannes; Wohlgemuth, Volker With the aim of assessing the impact of sand mining project environmental Lo River, subjects used the method of sediment transport modeling in rivers, using Sand Transport module in the hydrodynamic model Mike 21 for a particular project. The result was to determine the feasibility of a sand mining project on the Lo river. The subject has shown that the effects of sand mining project on the flow rate and changes in river bed surface and it is negligible. The method can be applied in order to calculate in other mining projects.

2013-01-01T00:00:00Z Wittmann, Jochen http://dl.gi.de/handle/20.500.12116/25924 2019-09-16T03:13:38Z 2013-01-01T00:00:00Z

Potential and Problems of the Cellular System Approach for Environmental Modeling and Simulation Wittmann, Jochen Page, Bernd; Fleischer, Andreas G.; Göbel, Johannes; Wohlgemuth, Volker By the growing use of geographic information systems (GIS) the use of cellular approaches for modelling and simulation spatial and especially geographical processes and systems gains more and more importance. This paper gives an overview over the basic definitions and emphasizes a proper differentiation between the very tight definition of real cellular automata and the very universal one for cellular systems. On the base of these definitions typical problems are discussed, which raise for modelling spatial objects given by raster or vector data and by representing spatial relationships between these objects. Furthermore the difference in semantics between neighbourhood relation in GIS and neighbourhood relations needed for modelling purposes are elaborated.

2013-01-01T00:00:00Z