AustralieFrV1, PascalFrancis, Corpus, bibRecord, 005021

Micromorphological study of slumping in a hardsetting seedbed under various wetting conditions

Identifieur interne : 005021 ( PascalFrancis/Corpus ); précédent : 005020; suivant : 005022

Micromorphological study of slumping in a hardsetting seedbed under various wetting conditions

Auteurs : L. M. Bresson ; C. J. Moran

Source :

Geoderma : (Amsterdam) [ 0016-7061 ] ; 2004.

RBID : Pascal:04-0138847

Descripteurs français

Pascal (Inist)
- Nouvelle Galles du Sud, Etude expérimentale, Propriété physicochimique, Porosité, Sol, Propriété physique, Terrain couverture, Etude laboratoire, Pluie, Cinétique, Lame mince, Irrigation, Limon, Simulation numérique, Erosion sol, Granulat, Abrasion, Compaction, Carotte, Dispersion, Goutte pluie, Micromorphologie, Slumping, Microfissure.

English descriptors

KwdEn :
- New South Wales, abrasion, aggregate, compaction, digital simulation, dispersion, drill cores, experimental studies, irrigation, kinetics, laboratory studies, loam, microfissures, micromorphology, overburden, physical properties, physicochemical properties, porosity, raindrops, rainfall, slumping, soil erosion, soils, thin sections.

Abstract

Slumping of hardsetting seedbeds upon wetting has not been extensively studied despite the likelihood that it determines the physical properties after drying. Slumping results from processes similar to those involved in crusting except that overburden pressure can dominate rather than rainfall kinetic energy. Only a few studies have dealt with the morphological description of slumping. To simulate different climatic and management conditions, repacked seedbeds of a hardsetting sandy-loam soil were subjected to a range of wetting conditions, e.g. capillary rise, immersion, and rainfall simulation. Slumping processes were characterized using qualitative and quantitative micromorphological observations of polished blocks and thin sections from resin-impregnated samples. A morphogenetical framework was proposed to help description of the complex associations of processes which can lead to structural collapse (crusting and slumping) on wetting. Three main stages were considered, i.e. aggregate disruption or abrasion, relocation of the released material, and compaction. In the hardsetting material studied here, structural collapse under slow wetting occurred at the bottom of cores due to aggregate coalescence under overburden pressure. Coalescence required aggregate cohesion being reduced by microcracking; therefore, it differed from the coalescence previously described in unstable silty loam soils where microcracking was not necessary for aggregates to coalesce. Macroporosity decreased most strongly under fast wetting due to physical dispersion and aggregate breakdown. Under simulated rainfall, compaction by raindrops could not be distinguish from aggregate breakdown. The role of overburden pressure and of rainfall kinetic energy remains to be stated; new data are required including measurement of total porosity in the initial, wet, and dry states.

Notice en format standard (ISO 2709)

Pour connaître la documentation sur le format Inist Standard.

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C01	`01`		`ENG`	@0 Slumping of hardsetting seedbeds upon wetting has not been extensively studied despite the likelihood that it determines the physical properties after drying. Slumping results from processes similar to those involved in crusting except that overburden pressure can dominate rather than rainfall kinetic energy. Only a few studies have dealt with the morphological description of slumping. To simulate different climatic and management conditions, repacked seedbeds of a hardsetting sandy-loam soil were subjected to a range of wetting conditions, e.g. capillary rise, immersion, and rainfall simulation. Slumping processes were characterized using qualitative and quantitative micromorphological observations of polished blocks and thin sections from resin-impregnated samples. A morphogenetical framework was proposed to help description of the complex associations of processes which can lead to structural collapse (crusting and slumping) on wetting. Three main stages were considered, i.e. aggregate disruption or abrasion, relocation of the released material, and compaction. In the hardsetting material studied here, structural collapse under slow wetting occurred at the bottom of cores due to aggregate coalescence under overburden pressure. Coalescence required aggregate cohesion being reduced by microcracking; therefore, it differed from the coalescence previously described in unstable silty loam soils where microcracking was not necessary for aggregates to coalesce. Macroporosity decreased most strongly under fast wetting due to physical dispersion and aggregate breakdown. Under simulated rainfall, compaction by raindrops could not be distinguish from aggregate breakdown. The role of overburden pressure and of rainfall kinetic energy remains to be stated; new data are required including measurement of total porosity in the initial, wet, and dry states.
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Format Inist (serveur)

NO :	PASCAL 04-0138847 INIST
ET :	Micromorphological study of slumping in a hardsetting seedbed under various wetting conditions
AU :	BRESSON (L. M.); MORAN (C. J.)
AF :	UMR INRA/INAPG Environnement et Grandes Cultures/78850 Thiverval-Grignon/France (1 aut.); CSIRO Land and Water GPO Box 1660/Canberra, ACT 2601/Australie (2 aut.)
DT :	Publication en série; Papier de recherche; Niveau analytique
SO :	Geoderma : (Amsterdam); ISSN 0016-7061; Coden GEDMAB; Pays-Bas; Da. 2004; Vol. 118; No. 3-4; Pp. 277-288; Bibl. 33 ref.
LA :	Anglais
EA :	Slumping of hardsetting seedbeds upon wetting has not been extensively studied despite the likelihood that it determines the physical properties after drying. Slumping results from processes similar to those involved in crusting except that overburden pressure can dominate rather than rainfall kinetic energy. Only a few studies have dealt with the morphological description of slumping. To simulate different climatic and management conditions, repacked seedbeds of a hardsetting sandy-loam soil were subjected to a range of wetting conditions, e.g. capillary rise, immersion, and rainfall simulation. Slumping processes were characterized using qualitative and quantitative micromorphological observations of polished blocks and thin sections from resin-impregnated samples. A morphogenetical framework was proposed to help description of the complex associations of processes which can lead to structural collapse (crusting and slumping) on wetting. Three main stages were considered, i.e. aggregate disruption or abrasion, relocation of the released material, and compaction. In the hardsetting material studied here, structural collapse under slow wetting occurred at the bottom of cores due to aggregate coalescence under overburden pressure. Coalescence required aggregate cohesion being reduced by microcracking; therefore, it differed from the coalescence previously described in unstable silty loam soils where microcracking was not necessary for aggregates to coalesce. Macroporosity decreased most strongly under fast wetting due to physical dispersion and aggregate breakdown. Under simulated rainfall, compaction by raindrops could not be distinguish from aggregate breakdown. The role of overburden pressure and of rainfall kinetic energy remains to be stated; new data are required including measurement of total porosity in the initial, wet, and dry states.
CC :	226C03; 001E01P03
FD :	Nouvelle Galles du Sud; Etude expérimentale; Propriété physicochimique; Porosité; Sol; Propriété physique; Terrain couverture; Etude laboratoire; Pluie; Cinétique; Lame mince; Irrigation; Limon; Simulation numérique; Erosion sol; Granulat; Abrasion; Compaction; Carotte; Dispersion; Goutte pluie; Micromorphologie; Slumping; Microfissure
FG :	Australie; Australasie
ED :	New South Wales; experimental studies; physicochemical properties; porosity; soils; physical properties; overburden; laboratory studies; rainfall; kinetics; thin sections; irrigation; loam; digital simulation; soil erosion; aggregate; abrasion; compaction; drill cores; dispersion; raindrops; micromorphology; slumping; microfissures
EG :	Australia; Australasia
SD :	Nueva Gales del Sur; Propiedad fisicoquímica; Porosidad; Suelo; Propiedad física; Lluvia; Cinética; Película delgada; Irrigación; Lodo; Simulación numérica; Erosión suelo; Agregado; Abrasión; Compactación; Testigo; Dispersión; Gota de lluvia; Micromorfología; Slumping; Microfisura
LO :	INIST-3607.354000116350920100
ID :	04-0138847

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Pascal:04-0138847

Le document en format XML

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<front><div type="abstract" xml:lang="en">Slumping of hardsetting seedbeds upon wetting has not been extensively studied despite the likelihood that it determines the physical properties after drying. Slumping results from processes similar to those involved in crusting except that overburden pressure can dominate rather than rainfall kinetic energy. Only a few studies have dealt with the morphological description of slumping. To simulate different climatic and management conditions, repacked seedbeds of a hardsetting sandy-loam soil were subjected to a range of wetting conditions, e.g. capillary rise, immersion, and rainfall simulation. Slumping processes were characterized using qualitative and quantitative micromorphological observations of polished blocks and thin sections from resin-impregnated samples. A morphogenetical framework was proposed to help description of the complex associations of processes which can lead to structural collapse (crusting and slumping) on wetting. Three main stages were considered, i.e. aggregate disruption or abrasion, relocation of the released material, and compaction. In the hardsetting material studied here, structural collapse under slow wetting occurred at the bottom of cores due to aggregate coalescence under overburden pressure. Coalescence required aggregate cohesion being reduced by microcracking; therefore, it differed from the coalescence previously described in unstable silty loam soils where microcracking was not necessary for aggregates to coalesce. Macroporosity decreased most strongly under fast wetting due to physical dispersion and aggregate breakdown. Under simulated rainfall, compaction by raindrops could not be distinguish from aggregate breakdown. The role of overburden pressure and of rainfall kinetic energy remains to be stated; new data are required including measurement of total porosity in the initial, wet, and dry states.</div>
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<fC01 i1="01" l="ENG"><s0>Slumping of hardsetting seedbeds upon wetting has not been extensively studied despite the likelihood that it determines the physical properties after drying. Slumping results from processes similar to those involved in crusting except that overburden pressure can dominate rather than rainfall kinetic energy. Only a few studies have dealt with the morphological description of slumping. To simulate different climatic and management conditions, repacked seedbeds of a hardsetting sandy-loam soil were subjected to a range of wetting conditions, e.g. capillary rise, immersion, and rainfall simulation. Slumping processes were characterized using qualitative and quantitative micromorphological observations of polished blocks and thin sections from resin-impregnated samples. A morphogenetical framework was proposed to help description of the complex associations of processes which can lead to structural collapse (crusting and slumping) on wetting. Three main stages were considered, i.e. aggregate disruption or abrasion, relocation of the released material, and compaction. In the hardsetting material studied here, structural collapse under slow wetting occurred at the bottom of cores due to aggregate coalescence under overburden pressure. Coalescence required aggregate cohesion being reduced by microcracking; therefore, it differed from the coalescence previously described in unstable silty loam soils where microcracking was not necessary for aggregates to coalesce. Macroporosity decreased most strongly under fast wetting due to physical dispersion and aggregate breakdown. Under simulated rainfall, compaction by raindrops could not be distinguish from aggregate breakdown. The role of overburden pressure and of rainfall kinetic energy remains to be stated; new data are required including measurement of total porosity in the initial, wet, and dry states.</s0>
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<s2>NG</s2>
<s5>01</s5>
</fC03>
<fC03 i1="02" i2="2" l="FRE"><s0>Etude expérimentale</s0>
<s5>02</s5>
</fC03>
<fC03 i1="02" i2="2" l="ENG"><s0>experimental studies</s0>
<s5>02</s5>
</fC03>
<fC03 i1="03" i2="2" l="FRE"><s0>Propriété physicochimique</s0>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="2" l="ENG"><s0>physicochemical properties</s0>
<s5>03</s5>
</fC03>
<fC03 i1="03" i2="2" l="SPA"><s0>Propiedad fisicoquímica</s0>
<s5>03</s5>
</fC03>
<fC03 i1="04" i2="2" l="FRE"><s0>Porosité</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="2" l="ENG"><s0>porosity</s0>
<s5>04</s5>
</fC03>
<fC03 i1="04" i2="2" l="SPA"><s0>Porosidad</s0>
<s5>04</s5>
</fC03>
<fC03 i1="05" i2="2" l="FRE"><s0>Sol</s0>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="2" l="ENG"><s0>soils</s0>
<s5>05</s5>
</fC03>
<fC03 i1="05" i2="2" l="SPA"><s0>Suelo</s0>
<s5>05</s5>
</fC03>
<fC03 i1="06" i2="2" l="FRE"><s0>Propriété physique</s0>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="2" l="ENG"><s0>physical properties</s0>
<s5>06</s5>
</fC03>
<fC03 i1="06" i2="2" l="SPA"><s0>Propiedad física</s0>
<s5>06</s5>
</fC03>
<fC03 i1="07" i2="2" l="FRE"><s0>Terrain couverture</s0>
<s5>07</s5>
</fC03>
<fC03 i1="07" i2="2" l="ENG"><s0>overburden</s0>
<s5>07</s5>
</fC03>
<fC03 i1="08" i2="2" l="FRE"><s0>Etude laboratoire</s0>
<s5>08</s5>
</fC03>
<fC03 i1="08" i2="2" l="ENG"><s0>laboratory studies</s0>
<s5>08</s5>
</fC03>
<fC03 i1="09" i2="2" l="FRE"><s0>Pluie</s0>
<s5>09</s5>
</fC03>
<fC03 i1="09" i2="2" l="ENG"><s0>rainfall</s0>
<s5>09</s5>
</fC03>
<fC03 i1="09" i2="2" l="SPA"><s0>Lluvia</s0>
<s5>09</s5>
</fC03>
<fC03 i1="10" i2="2" l="FRE"><s0>Cinétique</s0>
<s5>10</s5>
</fC03>
<fC03 i1="10" i2="2" l="ENG"><s0>kinetics</s0>
<s5>10</s5>
</fC03>
<fC03 i1="10" i2="2" l="SPA"><s0>Cinética</s0>
<s5>10</s5>
</fC03>
<fC03 i1="11" i2="2" l="FRE"><s0>Lame mince</s0>
<s5>11</s5>
</fC03>
<fC03 i1="11" i2="2" l="ENG"><s0>thin sections</s0>
<s5>11</s5>
</fC03>
<fC03 i1="11" i2="2" l="SPA"><s0>Película delgada</s0>
<s5>11</s5>
</fC03>
<fC03 i1="12" i2="2" l="FRE"><s0>Irrigation</s0>
<s5>12</s5>
</fC03>
<fC03 i1="12" i2="2" l="ENG"><s0>irrigation</s0>
<s5>12</s5>
</fC03>
<fC03 i1="12" i2="2" l="SPA"><s0>Irrigación</s0>
<s5>12</s5>
</fC03>
<fC03 i1="13" i2="2" l="FRE"><s0>Limon</s0>
<s5>13</s5>
</fC03>
<fC03 i1="13" i2="2" l="ENG"><s0>loam</s0>
<s5>13</s5>
</fC03>
<fC03 i1="13" i2="2" l="SPA"><s0>Lodo</s0>
<s5>13</s5>
</fC03>
<fC03 i1="14" i2="2" l="FRE"><s0>Simulation numérique</s0>
<s5>15</s5>
</fC03>
<fC03 i1="14" i2="2" l="ENG"><s0>digital simulation</s0>
<s5>15</s5>
</fC03>
<fC03 i1="14" i2="2" l="SPA"><s0>Simulación numérica</s0>
<s5>15</s5>
</fC03>
<fC03 i1="15" i2="2" l="FRE"><s0>Erosion sol</s0>
<s5>17</s5>
</fC03>
<fC03 i1="15" i2="2" l="ENG"><s0>soil erosion</s0>
<s5>17</s5>
</fC03>
<fC03 i1="15" i2="2" l="SPA"><s0>Erosión suelo</s0>
<s5>17</s5>
</fC03>
<fC03 i1="16" i2="2" l="FRE"><s0>Granulat</s0>
<s5>19</s5>
</fC03>
<fC03 i1="16" i2="2" l="ENG"><s0>aggregate</s0>
<s5>19</s5>
</fC03>
<fC03 i1="16" i2="2" l="SPA"><s0>Agregado</s0>
<s5>19</s5>
</fC03>
<fC03 i1="17" i2="2" l="FRE"><s0>Abrasion</s0>
<s5>20</s5>
</fC03>
<fC03 i1="17" i2="2" l="ENG"><s0>abrasion</s0>
<s5>20</s5>
</fC03>
<fC03 i1="17" i2="2" l="SPA"><s0>Abrasión</s0>
<s5>20</s5>
</fC03>
<fC03 i1="18" i2="2" l="FRE"><s0>Compaction</s0>
<s5>21</s5>
</fC03>
<fC03 i1="18" i2="2" l="ENG"><s0>compaction</s0>
<s5>21</s5>
</fC03>
<fC03 i1="18" i2="2" l="SPA"><s0>Compactación</s0>
<s5>21</s5>
</fC03>
<fC03 i1="19" i2="2" l="FRE"><s0>Carotte</s0>
<s5>22</s5>
</fC03>
<fC03 i1="19" i2="2" l="ENG"><s0>drill cores</s0>
<s5>22</s5>
</fC03>
<fC03 i1="19" i2="2" l="SPA"><s0>Testigo</s0>
<s5>22</s5>
</fC03>
<fC03 i1="20" i2="2" l="FRE"><s0>Dispersion</s0>
<s5>23</s5>
</fC03>
<fC03 i1="20" i2="2" l="ENG"><s0>dispersion</s0>
<s5>23</s5>
</fC03>
<fC03 i1="20" i2="2" l="SPA"><s0>Dispersión</s0>
<s5>23</s5>
</fC03>
<fC03 i1="21" i2="2" l="FRE"><s0>Goutte pluie</s0>
<s5>24</s5>
</fC03>
<fC03 i1="21" i2="2" l="ENG"><s0>raindrops</s0>
<s5>24</s5>
</fC03>
<fC03 i1="21" i2="2" l="SPA"><s0>Gota de lluvia</s0>
<s5>24</s5>
</fC03>
<fC03 i1="22" i2="2" l="FRE"><s0>Micromorphologie</s0>
<s5>62</s5>
</fC03>
<fC03 i1="22" i2="2" l="ENG"><s0>micromorphology</s0>
<s5>62</s5>
</fC03>
<fC03 i1="22" i2="2" l="SPA"><s0>Micromorfología</s0>
<s5>62</s5>
</fC03>
<fC03 i1="23" i2="2" l="FRE"><s0>Slumping</s0>
<s5>63</s5>
</fC03>
<fC03 i1="23" i2="2" l="ENG"><s0>slumping</s0>
<s5>63</s5>
</fC03>
<fC03 i1="23" i2="2" l="SPA"><s0>Slumping</s0>
<s5>63</s5>
</fC03>
<fC03 i1="24" i2="2" l="FRE"><s0>Microfissure</s0>
<s5>64</s5>
</fC03>
<fC03 i1="24" i2="2" l="ENG"><s0>microfissures</s0>
<s5>64</s5>
</fC03>
<fC03 i1="24" i2="2" l="SPA"><s0>Microfisura</s0>
<s5>64</s5>
</fC03>
<fC06><s0>ILS</s0>
<s0>TAS</s0>
</fC06>
<fC07 i1="01" i2="2" l="FRE"><s0>Australie</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="01" i2="2" l="ENG"><s0>Australia</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="01" i2="2" l="SPA"><s0>Australia</s0>
<s2>NG</s2>
</fC07>
<fC07 i1="02" i2="2" l="FRE"><s0>Australasie</s0>
</fC07>
<fC07 i1="02" i2="2" l="ENG"><s0>Australasia</s0>
</fC07>
<fC07 i1="02" i2="2" l="SPA"><s0>Australasia</s0>
</fC07>
<fN21><s1>089</s1>
</fN21>
<fN82><s1>PSI</s1>
</fN82>
</pA>
</standard>
<server><NO>PASCAL 04-0138847 INIST</NO>
<ET>Micromorphological study of slumping in a hardsetting seedbed under various wetting conditions</ET>
<AU>BRESSON (L. M.); MORAN (C. J.)</AU>
<AF>UMR INRA/INAPG Environnement et Grandes Cultures/78850 Thiverval-Grignon/France (1 aut.); CSIRO Land and Water GPO Box 1660/Canberra, ACT 2601/Australie (2 aut.)</AF>
<DT>Publication en série; Papier de recherche; Niveau analytique</DT>
<SO>Geoderma : (Amsterdam); ISSN 0016-7061; Coden GEDMAB; Pays-Bas; Da. 2004; Vol. 118; No. 3-4; Pp. 277-288; Bibl. 33 ref.</SO>
<LA>Anglais</LA>
<EA>Slumping of hardsetting seedbeds upon wetting has not been extensively studied despite the likelihood that it determines the physical properties after drying. Slumping results from processes similar to those involved in crusting except that overburden pressure can dominate rather than rainfall kinetic energy. Only a few studies have dealt with the morphological description of slumping. To simulate different climatic and management conditions, repacked seedbeds of a hardsetting sandy-loam soil were subjected to a range of wetting conditions, e.g. capillary rise, immersion, and rainfall simulation. Slumping processes were characterized using qualitative and quantitative micromorphological observations of polished blocks and thin sections from resin-impregnated samples. A morphogenetical framework was proposed to help description of the complex associations of processes which can lead to structural collapse (crusting and slumping) on wetting. Three main stages were considered, i.e. aggregate disruption or abrasion, relocation of the released material, and compaction. In the hardsetting material studied here, structural collapse under slow wetting occurred at the bottom of cores due to aggregate coalescence under overburden pressure. Coalescence required aggregate cohesion being reduced by microcracking; therefore, it differed from the coalescence previously described in unstable silty loam soils where microcracking was not necessary for aggregates to coalesce. Macroporosity decreased most strongly under fast wetting due to physical dispersion and aggregate breakdown. Under simulated rainfall, compaction by raindrops could not be distinguish from aggregate breakdown. The role of overburden pressure and of rainfall kinetic energy remains to be stated; new data are required including measurement of total porosity in the initial, wet, and dry states.</EA>
<CC>226C03; 001E01P03</CC>
<FD>Nouvelle Galles du Sud; Etude expérimentale; Propriété physicochimique; Porosité; Sol; Propriété physique; Terrain couverture; Etude laboratoire; Pluie; Cinétique; Lame mince; Irrigation; Limon; Simulation numérique; Erosion sol; Granulat; Abrasion; Compaction; Carotte; Dispersion; Goutte pluie; Micromorphologie; Slumping; Microfissure</FD>
<FG>Australie; Australasie</FG>
<ED>New South Wales; experimental studies; physicochemical properties; porosity; soils; physical properties; overburden; laboratory studies; rainfall; kinetics; thin sections; irrigation; loam; digital simulation; soil erosion; aggregate; abrasion; compaction; drill cores; dispersion; raindrops; micromorphology; slumping; microfissures</ED>
<EG>Australia; Australasia</EG>
<SD>Nueva Gales del Sur; Propiedad fisicoquímica; Porosidad; Suelo; Propiedad física; Lluvia; Cinética; Película delgada; Irrigación; Lodo; Simulación numérica; Erosión suelo; Agregado; Abrasión; Compactación; Testigo; Dispersión; Gota de lluvia; Micromorfología; Slumping; Microfisura</SD>
<LO>INIST-3607.354000116350920100</LO>
<ID>04-0138847</ID>
</server>
</inist>
</record>

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Micromorphological study of slumping in a hardsetting seedbed under various wetting conditions

Micromorphological study of slumping in a hardsetting seedbed under various wetting conditions

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