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Dezvoltarea unui model hidrologic pentru terenurile in panta

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PROGRAMUL CEEX<br />

CONTRBUTII STIINTIFICE IN TRANSPORTURI<br />

deoarece sunt usor de utilizat si suficient de precise si aceasta caracteristica este foarte importanta<br />

<strong>pentru</strong> <strong>model</strong>area aplicatiilor la scara baz<strong>in</strong>ului hidrografic <strong>pentru</strong> care este imposibil de stiut<br />

parametrii hidraulici <strong>pentru</strong> fiecare celula si de aplicat scheme numerice pe baza solutiei ecuatiei lui<br />

Richard.<br />

Rezultatele au demonstrat ca varianta propusa este capabila sa descrie adecvat evolutia cont<strong>in</strong>utului<br />

de apa d<strong>in</strong> sol <strong>pentru</strong> stratul de adancime cu o ecuatie diferentiala simpla care ia <strong>in</strong> considerare cele<br />

mai importante fluxuri care determ<strong>in</strong>a bilantul de apa d<strong>in</strong> sol. In acelasi timp, varianta aleasa pe<br />

baza solutiilor aproximative ale ecuatiei Richards permite descrierea cu acuratete a evolutiei<br />

umiditatii d<strong>in</strong> sol <strong>pentru</strong> stratul de sol de la suprafata si aceasta are un impact favorabil <strong>pentru</strong><br />

calcularea evaporatiei actuale d<strong>in</strong> sol. In plus, rezultatele au demonstrat eficienta functiilor de<br />

pedotransfer propuse <strong>pentru</strong> a estima parametrii si <strong>pentru</strong> a oferi performante satisfacatoare ale<br />

<strong>model</strong>ului de bilant de apa d<strong>in</strong> sol care ia <strong>in</strong> considerare diferitele proprietati hidraulice al solurilor.<br />

In concluzie, schemele propuse permit diferentierea umiditatii d<strong>in</strong> sol la scara baz<strong>in</strong>ului hidrografic<br />

pe baza catorva factori: proprietatile hidraulice ale solului, parametri de cultura si variabile<br />

topografice care <strong>in</strong>fluenteaza fluxurile potentiale si actuale de transpiratie si evaporatie.<br />

Bibliografie<br />

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velocity speed-up, roughness effect and turbulence. Quart. J. R. Met. Soc., 107, 91-110.<br />

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11. * MIKE SHE PP – User Manual - Water Balance Utility , DHI Water & Environment/DHI – Institut<br />

for Vand & Miljø<br />

12. Wösten, J.H.M., A. Lilly, A. Nemes, and C. Le Bas. 1999. Development and use of a database of<br />

hydraulic properties of European soils. Geoderma 90:169–185<br />

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comput<strong>in</strong>g crop water requirements. FAO Irrigation and Dra<strong>in</strong>age Paper BBCH Monograph, 2.<br />

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Biological Research Centre for Agriculture and Forestry.<br />

14. Varlet Grancher, C., 1975. Variation et estimation de l’énergie d’orig<strong>in</strong>e solaire recue sur des plans<br />

d’<strong>in</strong>cl<strong>in</strong>aison et d’azimuth variables. Ann. Agron., 26(3), 245-264 (In French).<br />

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4<br />

UCP AMTRANS - NOIEMBRIE 2007

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