Now showing items 1-20 of 64

    • Urban gullies in São Luis City, Maranhão State, Brazil 

      Guerra, A.J.; Bezerra, J.F.; Fullen, M.A.; Mendonça, J.K.S.; Sathler, R.; Lima, F.S.; Mendes, S.P.; Guerra, T.T. (Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa, 2007)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Urban gully erosion is a serious problem in São Luís City, Maranhão State, Brazil. São Luís Municipality covers 831.7 km? and is situated in west-central Maranhão Island (2º19’09”-2º51’00” S; 44º01’16”-44º19’37” W). ...
    • Ephemeral gully erosion research: processes and modeling 

      Alonso, C.V. (Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa, 2007)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      The USDA Natural Resources Conservation Service (NRCS) defines ephemeral gullies as small channels that can be filled in by normal tillage operations only to reform in the same location by subsequent runoff events. Ephemeral ...
    • Improving the structural stability of cropped soils in Olite (Navarre) using conservation tillage to reduce water erosion 

      Río Lahidalga, Iker del; Fernández Ugalde, Oihane Upna; Imaz Gurruchaga, María José Upna; Enrique Martín, Alberto Upna; Bescansa Miquel, Paloma Upna (Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa, 2007)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      The objective of this work was to compare the soil wet aggregate stability and its relationship to the soil organic matter stock in an agricultural soil under different types of tillage in a semi-arid area of Northern Spain.
    • Agricultural land use, piping and gullies activity in the Huelva lower valley (Saragossa, Spain) 

      Echeverría, M.T.; Ibarra, P.; Pérez Cabello, F. (Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa, 2007)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      The variations in the total amount of surface used for arable crops both for dry farming and fallow land, with regard to the different “agricultural policies”, have modified the natural dynamics of some processes such as ...
    • Relation between the location of check dams and adjacent vegetation cover in ephemeral gullies (Southeast Spain) 

      Conesa García, C.; Pérez Cutillas, P.; García Lorenzo, R. (Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa, 2007)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In general, the work carried out on vegetation in the Mediterranean catchments is focused more on the hillside vegetation cover than the riparian. Apart from occasional contributions by Alcaraz et al. (1997), Salinas et ...
    • Hydrological effects of the sediments deposited off a hillslope affected by rill erosion: project outlines and preliminary results 

      Giménez Díaz, Rafael Upna; Casalí Sarasíbar, Javier Upna; Campo Bescós, Miguel Ángel Upna (Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa, 2007)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      The main objectives of this project are (i) to evaluate the sedimentation rate generated by rill erosion in a hillslope and the granulometric characteristics of the sediment deposited off this hillslope, and (ii) to ...
    • AnnAGNPS ephemeral gully erosion simulation technology 

      Bingner, R.L.; Theurer, F.D.; Gordon, L.M.; Bennett, S.J.; Parker, C.; Thorne, C.; Alonso, C.V. (Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa, 2007)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Tillage-induced ephemeral gully erosion has been shown to be a significant and sometimes dominant source of sediment within a watershed. An approach has been developed within AnnAGNPS to assess the impact of conservation ...
    • Proposed methodology to quantify ephemeral gully erosion 

      Huang, C.; Nouwakpo, K.; Frankenberger, J.R. (Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa, 2007)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      The overall objective of the proposed research is to identify and quantify landscape attributes and hydrologic conditions that can be used to assess hillslope seepage and ephemeral gully erosion. We propose to use three ...
    • Implications of recent experimental findings for rill erosion modeling 

      Govers, G.; Giménez Díaz, Rafael Upna; Oost, K. van (Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa, 2007)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      The major aim of this paper is to critically review the theoretical concepts that are underpinning current models of rill flow and sediment detachment in the light of recent experimental results and, when necessary, to ...
    • Ephemeral gullies: to till or not to till? 

      Gordon, L.M.; Bennett, S.J.; Alonso, C.V.; Bingner, R.L. (Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa, 2007)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      While the perceived magnitude of ephemeral gully erosion may be masked after gullies are repaired, the action of plowing in these channels reduces topsoil thickness and crop productivity over a much wider area than the ...
    • Long term evolution of incised coastal channels on the isle of Wight, UK: insights from numerical modelling 

      Leyland, J.; Darby, S.E. (Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa, 2007)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Moderate rates of effective precipitation induce a realistic incised channel network, providing there is a step cliff profile present. Such a step profile is shown to be produced by sea-level rise and associated cliff ...
    • Concentrated flow erodibility of loess-derived topsoils: the impact of rainfall-induced consolidation and sealing 

      Knapen, A.; Poesen, J.; Baets, S. de (Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa, 2007)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      This study investigates the impact of rainfall-induced soil consolidation and soil surface sealing processes over time after tillage on soil erosion during concentrated flow. The soil erodibility (Kc) and critical flow ...
    • Ephemeral gully headcut development and migration in stratified soils 

      Gordon, L.M.; Bennett, S.J.; Wells, R.; Alonso, C.V. (Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa, 2007)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      The objectives of the current study were: (1) to quantify the effect of an erosion resistant (ER) soil layer placed at various depths within a soil profile on headcut development and migration; and (2) to assess the ...
    • Gully dynamics: initiation and morphology 

      Kirkby, M.J. (Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa, 2007)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      The paper reviews general conditions for initiation and maintenance of gullies.
    • Gullies on mars: the debate about formative processes (keynote) 

      Howard, A.D. (Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa, 2007)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      The discovery of very young gully systems on Mars has occasioned a lively debate about the processes and materials involved in their formation (Malin and Edgett, 2000). The strong interest in these features results because ...
    • Effects of slope processes and management in gullying 

      Desir, G.; Marín, C. (Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa, 2007)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Most erosion studies have been typically done in rill and interrill areas because the complexity of gullies and their large size have made their study very difficult. Morgan (1979) and Hudson (1985) define gullies as water ...
    • Evaluating airborne laser scanning for gully erosion detection and baseline mapping in the Fitzroy catchment, QLD, Australia 

      Eustace, A.H.; Witte, C.; Carey, B.W. (Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa, 2007)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Australia’s climate and land management practises have resulted in an increased threat to land condition and water quality through sediment transported by gully erosion. The Fitzroy River catchment is located in Queensland ...
    • Effect of topography on retreat rate of different gully headcuts in Bardenas Reales area (Navarre, Spain) 

      Campo Bescós, Miguel Ángel Upna; Álvarez Mozos, Jesús Upna; Casalí Sarasíbar, Javier Upna; Giménez Díaz, Rafael Upna (Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa, 2007)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In Northeast Spain, gullying is a widespread phenomenon. This type of erosion is especially intense in Bardenas Reales (Navarre) where at least two major typical kinds of gully headcut are present. A first group developed ...
    • Gully erosion in mountain area of SW-China, assessed using 137Cs and 210PBEX tracers and GPS survey 

      Li, Y.; Poesen, J.; Liu, L.M.; Li, L.; He, F.H.; Zhang, Q.W.; Li, R. (Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa, 2007)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Gullies are extensively distributed in the Upper Yangtze River Basin, SW-China. But the impact of these gullies on total sediment output is still not clear because there is no reliable technique for quantifying this issue. ...
    • A proposal to study gully erosion on silica sand and arkose slopes in central Spain 

      Lucía, A.; Sanz, M.A.; Vicente, F.; Martín, C.; Martín, J.F.; Bodoque, J.M.; Pedraza, J.; López, N. (Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa, 2007)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      A research project to be developed, granted by the Spanish Minister of Education and Science (project CGL2006-07207), aims to investigate gully erosion on silica sand and arkose slopes in Central Spain. The period of the ...