On the relationship between hydrographs and chemographs
Identifieur interne : 001887 ( Istex/Curation ); précédent : 001886; suivant : 001888On the relationship between hydrographs and chemographs
Auteurs : Andreas Kurtenbach [Allemagne] ; Steffen Möller [Allemagne] ; Andreas Krein [Allemagne] ; Wolfhard Symader [Allemagne]Source :
- Hydrological Processes [ 0885-6087 ] ; 2006-09.
English descriptors
Abstract
The spatial representativeness of gauging stations was investigated in two low‐mountainous river basins near the city of Trier, southwest Germany. Longitudinal profiles during low and high flow conditions were sampled in order to identify sources of solutes and to characterize the alteration of flood wave properties during its travel downstream. Numerous hydrographs and chemographs of natural flood events were analysed in detail. Additionally, artificial flood events were investigated to study in‐channel transport processes. During dry weather conditions the gauging station was only representative for a short river segment upstream, owing to discharge and solute concentrations of sources contiguous to the measurement site. During artificial flood events the kinematic wave velocity was considerably faster than the movement of water body and solutes, refuting the idea of a simple mixing process of individual runoff components. Depending on hydrological boundary conditions, the wave at a specific gauge could be entirely composed of old in‐channel water, which notably reduces the spatial representativeness of a sampling site. Natural flood events were characterized by a superimposition of local overland flow, riparian water and the kinematic wave process comprising the downstream conveyance of solutes. Summer floods in particular were marked by a chronological occurrence of distinct individual runoff components originating only from a few contributing areas adjacent to the stream and gauge. Thus, the representativeness of a gauge for processes in the whole basin depends on the distance of the nearest significant source to the station. The consequence of our study is that the assumptions of mixing models are not satisfied in river basins larger than 3 km2. Copyright © 2006 John Wiley & Sons, Ltd.
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DOI: 10.1002/hyp.6169
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of Hydrology, University of Trier, 54286 Trier</wicri:regionArea></affiliation></author></analytic><monogr></monogr><series><title level="j">Hydrological Processes</title><title level="j" type="sub">An International Journal</title><title level="j" type="abbrev">Hydrol. Process.</title><idno type="ISSN">0885-6087</idno><idno type="eISSN">1099-1085</idno><imprint><publisher>John Wiley & Sons, Ltd.</publisher><pubPlace>Chichester, UK</pubPlace><date type="published" when="2006-09">2006-09</date><biblScope unit="volume">20</biblScope><biblScope unit="issue">14</biblScope><biblScope unit="page" from="2921">2921</biblScope><biblScope unit="page" to="2934">2934</biblScope></imprint><idno type="ISSN">0885-6087</idno></series><idno type="istex">7CFDAD02150F666BE5EA8B28E7D2F8763EA1258E</idno><idno type="DOI">10.1002/hyp.6169</idno><idno type="ArticleID">HYP6169</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0885-6087</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>kinematic waves</term><term>mixing models</term><term>riparian water</term><term>runoff generation</term><term>storm events</term><term>tracer</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The spatial representativeness of gauging stations was investigated in two low‐mountainous river basins near the city of Trier, southwest Germany. Longitudinal profiles during low and high flow conditions were sampled in order to identify sources of solutes and to characterize the alteration of flood wave properties during its travel downstream. Numerous hydrographs and chemographs of natural flood events were analysed in detail. Additionally, artificial flood events were investigated to study in‐channel transport processes. During dry weather conditions the gauging station was only representative for a short river segment upstream, owing to discharge and solute concentrations of sources contiguous to the measurement site. During artificial flood events the kinematic wave velocity was considerably faster than the movement of water body and solutes, refuting the idea of a simple mixing process of individual runoff components. Depending on hydrological boundary conditions, the wave at a specific gauge could be entirely composed of old in‐channel water, which notably reduces the spatial representativeness of a sampling site. Natural flood events were characterized by a superimposition of local overland flow, riparian water and the kinematic wave process comprising the downstream conveyance of solutes. Summer floods in particular were marked by a chronological occurrence of distinct individual runoff components originating only from a few contributing areas adjacent to the stream and gauge. Thus, the representativeness of a gauge for processes in the whole basin depends on the distance of the nearest significant source to the station. The consequence of our study is that the assumptions of mixing models are not satisfied in river basins larger than 3 km2. Copyright © 2006 John Wiley & Sons, Ltd.</div></front></TEI></record>Pour manipuler ce document sous Unix (Dilib)
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