Podrobnosti záznamu

Název
    Mechanisms, timing, and rates of arid region mountain front recharge
Autor
    Bruthans, Jiří
    Carling, Greg T.
    Mayo, Alan L.
    Tingey, David
Jazyk
    anglicky
Typ dokumentu
    článek v periodiku
Zdrojový dokument - seriál
    Journal of Hydrology
Svazek/č.
    Roč. 428, č. March
Strany
    17
Rok
    2012
Výraz tezauru
    Arid region groundwater recharge
    Mountain front recharge
    Pilot Valley Utah-Nevada
Klíčové slovo
    Arid
    Front
    Mechanisms
    Mountain
    Rates
    Recharge
    Region
    Timing
Abstrakt (anglicky)
   Arid region mountain front recharge (MFR) for two catchments (17.5 and 25.6 km(2)) in the Silver Island Mountains, Utah, USA was evaluated by an analysis of catchment precipitation, mountain front and playa infiltration rates, aquifer parameters, and groundwater level responses in 59 shallow monitoring wells located at the distal end of the catchments. The 3-7 km long mountain front surfaces transition from alluvial fan deposits to a thin alluvial covering on lacustrine pediment surfaces. Precipitation and groundwater level data were collected from October 2005 to October 2010, which represents five recharge cycles. Average annual precipitation for all rain gauges during the 2005-2010 water years was 14.9 cm. Monitoring well water levels increased 91-97% of the time in response to storm events during times of general monitoring well water level increases and 29-38% of the time during times of general monitoring well water level declines. A surprising 81.7% of total catchment precipitat
   ion resulted in positive water level responses. Precipitation events as small as 2 mm resulted in positive water level responses and initial responses occurred within hours of some precipitation events. Water level responses that occur within hours of the larger precipitation events are attributed to focused groundwater recharge in near field braided stream channels. The time lag between the end of precipitation events and the maximum water level responses, which may be several days, is attributed to far field recharge. Direct MFR was calculated using a modified version of the water table fluctuation method. For the two catchments the average calculated direct MFR was 2.7-3.2% using PRISM precipitation data, and 3.7-4.5% using rain gauge data.
Přispěvatel
    UK Praha, Přírodovědecká fakulta
Kód přispěvatele
    UK, PřF
Zdrojový formát
    R
Datum importu
    27. 4. 2014