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000006986 1001_ $$0P:(DE-HGF)0$$aBronstert, A.$$b0
000006986 245__ $$aInteractions and feedbacks in hydrological change: Relevance and possibilities of modelling
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000006986 440_0 $$012265$$aHydrologie und Wasserbewirtschaftung$$v53$$x0012-0235
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000006986 520__ $$aThe hydrological cycle is a dynamic system by its nature, but sometimes accelerated through anthropogenic activity. A "hydrological change" (i.e. a water cycle that is significantly changing over a longer period of time) can be very different in character, depending on the specific natural conditions and the underlying spatial and temporal scales. Such changes may affect the availability and quality of water as essential pre-requisites for human development and ecosystem stability. Hydrological extremes, such as floods and droughts, may also be affected, what is also vitally important, because of their profound economic and societal impacts. Anthropogenically induced hydrological change can be attributed to three main external causes: first, the Earth's climate is changing significantly and thus directly affecting the terrestrial hydro-systems via the exchange of energy and heat. The second major issue is the land cover and its management that has been modified fundamentally by conversion of land for agriculture, forestry, and other purposes such as industrialisation and urbanisation. Finally, water resources are being used more than ever for human development, especially for agriculture, industrial activities, and navigation.If the regional terrestrial hydrological cycle is changing and counter-measures are desirable, it is from a scientific perspective mandatory to understand the extent and nature of such changes, and, especially, to identify their possible anthropogenic origin. There are, however, fundamental gaps in our knowledge, in particular about the role of feedbacks between individual processes and compartments of the hydrological cycle or the relevance of the interactions with other sub-systems of our planet, such as the atmosphere or the vegetation.This paper mentions several examples of hydrological change and discusses their identification, interaction processes, and feedback mechanisms, along with modelling issues. The possibilities and limitations of modelling are demonstrated by means of two studies: one from the river-lake system on the Middle-Havel River and one from the catchment of the Wahnbach Reservoir. The applied model systems comprise a series of consecutively coupled individual models (so-called one-way-coupling). Model systems that are able reflect feedback effects (two-way-coupling) are still in the development stage. It became clear that the applied model systems were able to reproduce the observed dynamics of the hydrological cycle and of selected matter fluxes. However, one has to be aware that the simulated time periods and scenarios represent rather moderately transient conditions, what is the justification why the one-way-coupling seems to be applicable. Furthermore, it was shown that the modelling uncertainty is considerably large. Nevertheless, this uncertainty can be distinguished from effects of changed internal systems dynamics or from changed boundary conditions, what is a basis for the usability of such model systems for prognostic purposes.
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000006986 65320 $$2Author$$aFeedback
000006986 65320 $$2Author$$ahydrologic change
000006986 65320 $$2Author$$ainteractions
000006986 65320 $$2Author$$amodelling quantity and quality
000006986 7001_ $$0P:(DE-HGF)0$$aKneis, D.$$b1
000006986 7001_ $$0P:(DE-Juel1)129440$$aBogena, H. R.$$b2$$uFZJ
000006986 773__ $$0PERI:(DE-600)2667551-1$$gVol. 53, p. 289 - 304$$p289 - 304$$q53<289 - 304$$tHydrologie und Wasserbewirtschaftung: HyWa$$v53$$x0012-0235$$y2009
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