Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1080/02626667.2014.913793 |
A transient phreatic surface mound, evidenced by a strip of vegetation on an earth dam | |
Kacimov, A. R.1; Brown, G.2 | |
通讯作者 | Kacimov, A. R. |
来源期刊 | HYDROLOGICAL SCIENCES JOURNAL-JOURNAL DES SCIENCES HYDROLOGIQUES
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ISSN | 0262-6667 |
EISSN | 2150-3435 |
出版年 | 2015 |
卷号 | 60期号:2页码:361-378 |
英文摘要 | On the slopes of the embankment of the Al-Khod groundwater recharge-flood protection dam (Oman), a band of scrub vegetation community emerged after torrential rains and temporary filling of the dam reservoir. Species composition differs markedly on both sides of the embankment, with many exotics found on the reservoir side and more typical gravel-desert species on the outside. Hydro-ecologically, the vegetation is interpreted as the footprint of a temporary storage of water, which is a small-sized groundwater mound within the permeable shoulder of the levee. The levee, as an anthropogenic landform, induces a U-turn (gravitational slumping-lateral seepage-transpirational moisture ascent) topology of seepage. The Lembke method of successive variations of steady states is used in modelling the water table dynamics. In the early stage of the mound decay, outflow through a seepage face of the shoulder is modelled by the Barenblatt slumping parabola of the phreatic-zone part of the flow domain, which is perfectly matched with the Youngs exact solution for a purely horizontal flow through a porous wedge. At the stitching cross-section, the flow rates and saturated depths in the two zones coincide. The late stage of mound evolution is characterized by transpiration by the plant roots projected onto a shrinking free surface, with the Barenblatt and Youngs solutions conjugated but without the outcrop of the saturated mound on the levee slope. Ordinary differential equations for the sliding or descending locus of the intersection of the parabola and the triangle hypotenuse are integrated in a closed form or by the Runge-Kutta method. The dwindling saturated volume and the rate of drainage are obtained. They can be used in assessments of the hydro-ecological sustainability of slope-rooted shrubs (vegetation survival between rare rainfall episodes). [GRAPHICS] Editor D. Koutsoyiannis; Associate editor A. Porporato |
英文关键词 | levee Boussinesq equation ecohydrology seepage face front-involving boundary value problem |
类型 | Article |
语种 | 英语 |
国家 | Oman |
收录类别 | SCI-E |
WOS记录号 | WOS:000347703000014 |
WOS关键词 | HALOXYLON SALICORNICUM COMMUNITY ; SOIL-MOISTURE DYNAMICS ; MINIATURE DUNES ; SUBSURFACE FLOW ; WATER-USE ; ECOHYDROLOGY ; HILLSLOPE ; SEEPAGE ; DESERT ; KUWAIT |
WOS类目 | Water Resources |
WOS研究方向 | Water Resources |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/187735 |
作者单位 | 1.Sultan Qaboos Univ, Dept Soils Water & Agr Engn, Muscat, Oman; 2.Sultan Qaboos Univ, Dept Biol, Muscat, Oman |
推荐引用方式 GB/T 7714 | Kacimov, A. R.,Brown, G.. A transient phreatic surface mound, evidenced by a strip of vegetation on an earth dam[J],2015,60(2):361-378. |
APA | Kacimov, A. R.,&Brown, G..(2015).A transient phreatic surface mound, evidenced by a strip of vegetation on an earth dam.HYDROLOGICAL SCIENCES JOURNAL-JOURNAL DES SCIENCES HYDROLOGIQUES,60(2),361-378. |
MLA | Kacimov, A. R.,et al."A transient phreatic surface mound, evidenced by a strip of vegetation on an earth dam".HYDROLOGICAL SCIENCES JOURNAL-JOURNAL DES SCIENCES HYDROLOGIQUES 60.2(2015):361-378. |
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