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| Titel |
Hydrologic behaviour of the Lake of Monate (Italy): a parsimonious modelling strategy |
| VerfasserIn |
Giulia Tomesani, Irene Soligno, Attilio Castellarin, Emanuele Baratti, Federico Cervi, Alberto Montanari |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250135237
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| Publikation (Nr.) |
 EGU/EGU2016-16077.pdf |
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| Zusammenfassung |
| The Lake of Monate (province of Varese, Northern Italy), is a unique example of ecosystem
in equilibrium. The lake water quality is deemed excellent notwithstanding the intensive
agricultural cultivation, industrial assets and mining activities characterising the surrounding
areas. The lake has a true touristic vocation and is the only swimmable water body of the
province of Varese, which counts several natural lakes. Lake of Monate has no tributary and
its overall watershed area is equal to c.a. 6.6 km2 including the lake surface (i.e. 2.6 km2), of
which 3.3 out of c.a. 4.0 km2 belong to the topographical watershed, while the
remaining 0.7 km2 belong to the underground watershed. The latter is larger than
the topographical watershed due to the presence of moraine formations on top of
the limestone bedrock. The local administration recently promoted an intensive
environmental monitoring campaign that aims to reach a better understanding of the
hydrology of the lake and the subsurface water fluxes. The monitoring campaign
started in October 2013 and, as a result, several meteoclimatic and hydrologic data
have been collected up to now at daily and hourly timescales. Our study focuses on
a preliminary representation of the hydrological behaviour of the lake through a
modified version of HyMOD, a conceptual 5-parameter lumped rainfall-runoff model
based on the probability-distributed soil storage capacity. The modified model is a
semi-distributed application of HyMOD that uses the same five parameters of the
original version and simulates the rainfall-runoff transformation for the whole lake
watershed at daily time scale in terms of: direct precipitation on, and evaporation
from, the lake surface; overall lake inflow, by separating the runoff component
(topographic watershed) from the groundwater component (overall watershed);
lake water-level oscillation; streamflow at the lake outlet. We used the first year of
hydrometeorological observations as calibration data and the second year as validation
data and we compared two calibration strategies which maximize two different
objective functions: (1) Nash-Sutcliffe efficiency of simulated daily water-level
fluctuations, NSE, and (2) linear correlation coefficient between daily series of
simulated groundwater inflow and observed water table elevation multiplied by NSE.
The validation exercise seems to point out the value of incorporating groundwater
measurements for improving the reliability and robustness of the conceptual model. |
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