@article{fdi:010076269,
  title = {{S}oil hydraulic properties in a marly gully catchment ({D}raix, {F}rance)},
  author = {{E}steves, {M}ichel and {D}escroix, {L}uc and {M}athys, {N}. and {L}apetite, {J}ean-{M}arc},
  editor = {},
  language = {{ENG}},
  abstract = {{R}unoff is one of the main factors controlling gully development. {C}oncentrated flow erosion occurs where flow discharge and velocity exceed critical values. {I}n {S}outhern {F}rench {A}lps, in black marl gully catchments, runoff from hillslopes occurs in the form of {H}ortonian overland flow because rainfall intensities exceed the infiltration capacity of the soil. {I}n such a situation, spatial variability of infiltration capacities is critical for describing the runoff production. {T}his study reports detailed field measurements of near-saturation and saturated infiltration properties: capillary sorptivity ({S}) and hydraulic conductivity ({K}). {A} total of 140 infiltration tests were conducted using tension disc and ponded ring infiltrometers on 6 different regoliths (weathering profile) encountered in a marly gully catchment. {T}he main objectives were to improve our knowledge of the spatial variability of infiltration in black marl areas and to compare different field and data analysis methods. {H}ydraulic conductivity values {K}(h) at supply pressure heads (h) ranging from h = - 100 up to h =0 mm were calculated using steady state flow and {W}ooding's equation [{W}ooding, {R}.{A}., 1968. {S}teady infiltration from shallow circular pond. {W}ater {R}esour. {R}es. 4 (6), 1259-1273]. {K}(h=0 mm) was also estimated from the ponded ring infiltrometer data set. {T}he estimation of sorptivity was based on transient flow and the solution of {H}averkamp et al. [{H}averkamp, {R}., {R}oos, {P}.{J}., {S}mettem, {K}.{R}.{J}., {P}arlange, {J}.{Y}., 1994. {T}hree dimensional analysis of infiltration from the disc infiltrometer. 2. {P}hysical based infiltration equation. {W}ater {R}esour. {R}es. 30 (11), 2931-2935]. {T}hree methods were used to analyse tension disc infiltrometer data: multiple radii, multiple potential and single test. {O}nly the multiple radii method was found not suitable in our context due to a large spatial variability in the infiltration properties over small distances. {T}he other methods gave similar estimates of the hydraulic conductivity. {T}he hydraulic conductivity {K}(h) ranged up to two orders of magnitude. {T}his result confirms the role played by structural voids when the regolith is at near saturation. {T}he dispersion of the estimates of field saturated hydraulic conductivity is larger than unsaturated values. {T}he spatial differences found are explained by the topographical position and by the regolith structure observed for the 6 sites. {A}n analysis based on the ponding time show that the regolith type plays an important role in the dynamic of the runoff production. (c) 2005 {E}lsevier {B}.{V}. {A}ll rights reserved.},
  keywords = {tension disc and ring infiltrometers ; soil surface fatures ; runoff generation ; ponding time ; spatial variability ; {FRANCE}},
  booktitle = {},
  journal = {{C}atena},
  volume = {63},
  numero = {2-3 ({N}o sp{\'e}cial)},
  pages = {282--298},
  ISSN = {0341-8162},
  year = {2005},
  DOI = {10.1016/j.catena.2005.06.006},
  URL = {https://www.documentation.ird.fr/hor/fdi:010076269},
}