Hydrological characterization of cessation of flow periods in temporary rivers: A methodology assessment performed in the Guadiana Basin
Author
Delso Martinez, Javier
Term
4. term
Publication year
2016
Submitted on
2016-06-01
Pages
68
Abstract
Midlertidige vandløb—vandløb der ikke fører vand hele året—er udbredte og vigtige i de semi‑aride middelhavsbassiner. Dette speciale fokuserer på Guadiana‑bassinet og indgår i et CEDEX‑projekt (Civil Engineering Research Centre of Spain), der videreudvikler en metode til hydrologisk karakterisering af perioder med ophør af strømning, med fokus på perioder med nul vandføring (ofte kaldet nul‑hydroperioder). Først blev den eksisterende metode anvendt på flere midlertidige vandløb i bassinet, udvalgt fordi de havde tilstrækkeligt lange dataserier. Derefter blev der gennemført analyser for at finde mulige forbedringer af metoden. Resultaterne viser, at metoden kan styrkes; specialet præsenterer en forbedret version og beskriver de vigtigste ændringer. Arbejdet giver et klarere grundlag for at beskrive, hvornår og hvor længe midlertidige vandløb holder op med at strømme.
Temporary rivers—streams that do not flow year‑round—are widespread and important in semi‑arid Mediterranean basins. This thesis focuses on the Guadiana Basin and contributes to a CEDEX (Civil Engineering Research Centre of Spain) project that advances a method to hydrologically characterize cessation‑of‑flow periods, with emphasis on times with zero discharge (often called null hydroperiods). First, the existing method was applied to several temporary rivers in the basin with sufficiently long flow records. Then, additional analyses were conducted to identify potential improvements. The results show the method can be enhanced; the thesis introduces an improved version and outlines its main changes. This provides a clearer basis for describing when and for how long temporary rivers stop flowing.
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