Pore Structure and Unsaturated Hydraulic Conductivity of Engineered Media for Living Roofs and Bioretention Based on Water Retention Data
AbstractCharacterizing pore structure and hydraulic properties of engineered media used in stormwater control measures (e.g., green roofs and bioretention) is critical for accurately predicting water and contaminant flow characteristics, water availability to plants, and aeration status. In this stu...
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| Veröffentlicht in: | Journal of hydrologic engineering 2018-03, Vol.23 (3) |
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| creator | Liu, Ruifen Fassman-Beck, Elizabeth |
| description | AbstractCharacterizing pore structure and hydraulic properties of engineered media used in stormwater control measures (e.g., green roofs and bioretention) is critical for accurately predicting water and contaminant flow characteristics, water availability to plants, and aeration status. In this study, unsaturated hydraulic properties, namely, the water retention characteristic (WRC) and unsaturated hydraulic conductivity (K), were measured for 14 engineered media with varying compositions. Their WRCs were also used to investigate pore structures and estimate hydraulic conductivities. Results indicate that water retention dynamics in 10 pumice-based media involve complex interactions between interaggregate and intra-aggregate pores, for which the commonly used van Genuchten function is not suitable. The majority of the pores in the tested media have radii less than 1 mm, for which the Richards equation is applicable. A predictive K function based on WRC and Mualem’s approach tends to underestimate K at low water contents. More research is needed to study hydrological behavior of engineered media with complex pore systems under various flow conditions. |
| doi_str_mv | 10.1061/(ASCE)HE.1943-5584.0001621 |
| format | Article |
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In this study, unsaturated hydraulic properties, namely, the water retention characteristic (WRC) and unsaturated hydraulic conductivity (K), were measured for 14 engineered media with varying compositions. Their WRCs were also used to investigate pore structures and estimate hydraulic conductivities. Results indicate that water retention dynamics in 10 pumice-based media involve complex interactions between interaggregate and intra-aggregate pores, for which the commonly used van Genuchten function is not suitable. The majority of the pores in the tested media have radii less than 1 mm, for which the Richards equation is applicable. A predictive K function based on WRC and Mualem’s approach tends to underestimate K at low water contents. More research is needed to study hydrological behavior of engineered media with complex pore systems under various flow conditions.</description><identifier>ISSN: 1084-0699</identifier><identifier>EISSN: 1943-5584</identifier><identifier>DOI: 10.1061/(ASCE)HE.1943-5584.0001621</identifier><language>eng</language><publisher>New York: American Society of Civil Engineers</publisher><subject>Aeration ; Civil engineering ; Conductivity ; Contaminants ; Dynamics ; Flow characteristics ; Green buildings ; Green roofs ; Hydraulic conductivity ; Hydraulic engineering ; Hydraulic properties ; Hydraulics ; Hydrology ; Interactions ; Mathematical models ; Media ; Plants (botany) ; Pores ; Porosity ; Properties ; Pumice ; Retention ; Retention basins ; Roofs ; Storms ; Stormwater ; Technical Papers ; Water ; Water availability ; Water pollution</subject><ispartof>Journal of hydrologic engineering, 2018-03, Vol.23 (3)</ispartof><rights>2017 American Society of Civil Engineers</rights><rights>Copyright American Society of Civil Engineers Mar 2018</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a374t-7819cbc8c8e3dc517d1b1d3954273a92c42c31e38fe090105df1ba6ca031f8763</citedby><cites>FETCH-LOGICAL-a374t-7819cbc8c8e3dc517d1b1d3954273a92c42c31e38fe090105df1ba6ca031f8763</cites><orcidid>0000-0002-2013-1847</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttp://ascelibrary.org/doi/pdf/10.1061/(ASCE)HE.1943-5584.0001621$$EPDF$$P50$$Gasce$$H</linktopdf><linktohtml>$$Uhttp://ascelibrary.org/doi/abs/10.1061/(ASCE)HE.1943-5584.0001621$$EHTML$$P50$$Gasce$$H</linktohtml><link.rule.ids>314,780,784,27924,27925,76193,76201</link.rule.ids></links><search><creatorcontrib>Liu, Ruifen</creatorcontrib><creatorcontrib>Fassman-Beck, Elizabeth</creatorcontrib><title>Pore Structure and Unsaturated Hydraulic Conductivity of Engineered Media for Living Roofs and Bioretention Based on Water Retention Data</title><title>Journal of hydrologic engineering</title><description>AbstractCharacterizing pore structure and hydraulic properties of engineered media used in stormwater control measures (e.g., green roofs and bioretention) is critical for accurately predicting water and contaminant flow characteristics, water availability to plants, and aeration status. In this study, unsaturated hydraulic properties, namely, the water retention characteristic (WRC) and unsaturated hydraulic conductivity (K), were measured for 14 engineered media with varying compositions. Their WRCs were also used to investigate pore structures and estimate hydraulic conductivities. Results indicate that water retention dynamics in 10 pumice-based media involve complex interactions between interaggregate and intra-aggregate pores, for which the commonly used van Genuchten function is not suitable. The majority of the pores in the tested media have radii less than 1 mm, for which the Richards equation is applicable. A predictive K function based on WRC and Mualem’s approach tends to underestimate K at low water contents. More research is needed to study hydrological behavior of engineered media with complex pore systems under various flow conditions.</description><subject>Aeration</subject><subject>Civil engineering</subject><subject>Conductivity</subject><subject>Contaminants</subject><subject>Dynamics</subject><subject>Flow characteristics</subject><subject>Green buildings</subject><subject>Green roofs</subject><subject>Hydraulic conductivity</subject><subject>Hydraulic engineering</subject><subject>Hydraulic properties</subject><subject>Hydraulics</subject><subject>Hydrology</subject><subject>Interactions</subject><subject>Mathematical models</subject><subject>Media</subject><subject>Plants (botany)</subject><subject>Pores</subject><subject>Porosity</subject><subject>Properties</subject><subject>Pumice</subject><subject>Retention</subject><subject>Retention basins</subject><subject>Roofs</subject><subject>Storms</subject><subject>Stormwater</subject><subject>Technical Papers</subject><subject>Water</subject><subject>Water availability</subject><subject>Water pollution</subject><issn>1084-0699</issn><issn>1943-5584</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><recordid>eNp1kM1KAzEUhQdRUKvvEHSji6m5TeYn7to6WqGiVMVlSJOMTKlJTTJCH8G3NmNLceMq5-Z-51w4SXIGuA84h6uL4fO4upxUfWCUpFlW0j7GGPIB7CVHu7_9qHFJU5wzdpgce7-IDI3DUfL9ZJ1Gz8G1MrRRCaPQq_EiDiJohSZr5US7bCQaW6Mi1Hw1YY1sjSrz3hitXYQetGoEqq1D07g272hmbe1_s0ZNzA_ahMYaNBI-0lG8xWyHZrvFjQjiJDmoxdLr0-3bS15vq5fxJJ0-3t2Ph9NUkIKGtCiBybksZamJkhkUCuagCMvooCCCDSQdSAKalLXGDAPOVA1zkUuBCdRlkZNecr7JXTn72Wof-MK2zsSTHFgJBFPKOup6Q0lnvXe65ivXfAi35oB5Vz3nXfV8UvGuZt7VzLfVR3O-MQsv9Z_4rfN_4w8fe4mH</recordid><startdate>20180301</startdate><enddate>20180301</enddate><creator>Liu, Ruifen</creator><creator>Fassman-Beck, Elizabeth</creator><general>American Society of Civil Engineers</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7QH</scope><scope>7TG</scope><scope>7UA</scope><scope>8FD</scope><scope>C1K</scope><scope>F1W</scope><scope>FR3</scope><scope>H96</scope><scope>KL.</scope><scope>KR7</scope><scope>L.G</scope><orcidid>https://orcid.org/0000-0002-2013-1847</orcidid></search><sort><creationdate>20180301</creationdate><title>Pore Structure and Unsaturated Hydraulic Conductivity of Engineered Media for Living Roofs and Bioretention Based on Water Retention Data</title><author>Liu, Ruifen ; Fassman-Beck, Elizabeth</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a374t-7819cbc8c8e3dc517d1b1d3954273a92c42c31e38fe090105df1ba6ca031f8763</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2018</creationdate><topic>Aeration</topic><topic>Civil engineering</topic><topic>Conductivity</topic><topic>Contaminants</topic><topic>Dynamics</topic><topic>Flow characteristics</topic><topic>Green buildings</topic><topic>Green roofs</topic><topic>Hydraulic conductivity</topic><topic>Hydraulic engineering</topic><topic>Hydraulic properties</topic><topic>Hydraulics</topic><topic>Hydrology</topic><topic>Interactions</topic><topic>Mathematical models</topic><topic>Media</topic><topic>Plants (botany)</topic><topic>Pores</topic><topic>Porosity</topic><topic>Properties</topic><topic>Pumice</topic><topic>Retention</topic><topic>Retention basins</topic><topic>Roofs</topic><topic>Storms</topic><topic>Stormwater</topic><topic>Technical Papers</topic><topic>Water</topic><topic>Water availability</topic><topic>Water pollution</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Liu, Ruifen</creatorcontrib><creatorcontrib>Fassman-Beck, Elizabeth</creatorcontrib><collection>CrossRef</collection><collection>Aqualine</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Water Resources Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Engineering Research Database</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Civil Engineering Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><jtitle>Journal of hydrologic engineering</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Liu, Ruifen</au><au>Fassman-Beck, Elizabeth</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Pore Structure and Unsaturated Hydraulic Conductivity of Engineered Media for Living Roofs and Bioretention Based on Water Retention Data</atitle><jtitle>Journal of hydrologic engineering</jtitle><date>2018-03-01</date><risdate>2018</risdate><volume>23</volume><issue>3</issue><issn>1084-0699</issn><eissn>1943-5584</eissn><abstract>AbstractCharacterizing pore structure and hydraulic properties of engineered media used in stormwater control measures (e.g., green roofs and bioretention) is critical for accurately predicting water and contaminant flow characteristics, water availability to plants, and aeration status. In this study, unsaturated hydraulic properties, namely, the water retention characteristic (WRC) and unsaturated hydraulic conductivity (K), were measured for 14 engineered media with varying compositions. Their WRCs were also used to investigate pore structures and estimate hydraulic conductivities. Results indicate that water retention dynamics in 10 pumice-based media involve complex interactions between interaggregate and intra-aggregate pores, for which the commonly used van Genuchten function is not suitable. The majority of the pores in the tested media have radii less than 1 mm, for which the Richards equation is applicable. A predictive K function based on WRC and Mualem’s approach tends to underestimate K at low water contents. More research is needed to study hydrological behavior of engineered media with complex pore systems under various flow conditions.</abstract><cop>New York</cop><pub>American Society of Civil Engineers</pub><doi>10.1061/(ASCE)HE.1943-5584.0001621</doi><orcidid>https://orcid.org/0000-0002-2013-1847</orcidid></addata></record> |
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| source | American Society of Civil Engineers:NESLI2:Journals:2014 |
| subjects | Aeration Civil engineering Conductivity Contaminants Dynamics Flow characteristics Green buildings Green roofs Hydraulic conductivity Hydraulic engineering Hydraulic properties Hydraulics Hydrology Interactions Mathematical models Media Plants (botany) Pores Porosity Properties Pumice Retention Retention basins Roofs Storms Stormwater Technical Papers Water Water availability Water pollution |
| title | Pore Structure and Unsaturated Hydraulic Conductivity of Engineered Media for Living Roofs and Bioretention Based on Water Retention Data |
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