Analysis of sediment export and ephemeral gully erosion in small agricultural watersheds of Iowa and Navarre
Fecha
2022Director
Versión
Acceso embargado 2 años / 2 urteko bahitura
Tipo
Tesis doctoral / Doktoretza tesia
Identificador del proyecto
Impacto
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10.48035/Tesis/2454/42611
Resumen
Agricultural activity can significantly affect the environment. The rising global demand for
agricultural products, largely as a result of population growth, only increases the pressure on soil
resources. In fact, soil erosion and water pollution with sediment are considered among the most
critical environmental threats worldwide. This thesis aims to obtain new insights into the
phenomenon of ...
[++]
Agricultural activity can significantly affect the environment. The rising global demand for
agricultural products, largely as a result of population growth, only increases the pressure on soil
resources. In fact, soil erosion and water pollution with sediment are considered among the most
critical environmental threats worldwide. This thesis aims to obtain new insights into the
phenomenon of soil erosion and sediment export in cultivated areas, of its processes, and to the
factors that control them, and evaluate our capacity to predict and simulate some of these
processes. The spatial and temporal scale of the study consists of multiple levels, starting from the
analysis of at the "watershed scale" using the Experimental Agricultural Watershed Network of the
Government of Navarre, both at the multiannual and event-level, and going further into the
analysis at the micro-watershed level by studying ephemeral gully erosion and its modeling using
information from very detailed observations in Iowa. The following specific objectives addressed
this general objective: (i) analyze the hydrological and sediment export behavior of small
agricultural watersheds in Navarre; (ii) explore the use of high-resolution measurements of
hydrological variables (turbidity, discharge and precipitation) to characterize sediment
concentration in agricultural watersheds during storm events; (iii) obtain new insights about
internal watershed processes by investigating the factors that condition the occurrence and
growth of ephemeral gullies in agricultural micro-watersheds in Iowa; and (iv) to evaluate the
capability of the AnnAGNPS-TIEGEM (Tillage lnduced Ephemeral Gully Erosion Model) model to
simulate ephemeral gully erosion in Iowa, and propose improvements to the model in light of the
results obtained. [--]
Materias
Sediment export,
Ephemeral gully erosion,
Agricultural watersheds,
Iowa,
Navarre
Departamento
Universidad Pública de Navarra. Departamento de Ingeniería /
Nafarroako Unibertsitate Publikoa. Ingeniaritza Saila
Programa de doctorado
Versión del editor
Entidades Financiadoras
This work was performed under the Non-Funded Cooperative Agreement between USDA (REE) - UPNA project number 6060-13000-026-037-N and received funding via the Research Project CGL2015-64284-C2-1-R and PID2020-112908RB-I00 funded by
MCIN/ AEI /10.13039/501100011033/ FEDER 'Una manera de hacer Europa'. In addition, the author of this thesis was funded by a scholarship from the Public University of Navarre and received two travel grants from the Government of Navarre.