干旱区生态环境知识资源中心(Arid): Status of understanding of the saturated-zone ground-water flow system at Yucca Mountain, Nevada, as of 1995

Arid

DOI	10.2172/437703
报告编号	DOE/NV/10874--T8; USGS-WRI--96-4077
来源ID	OSTI_ID: 437703
	Status of understanding of the saturated-zone ground-water flow system at Yucca Mountain, Nevada, as of 1995
	Luckey, R.R.; Tucci, P.; Faunt, C.C.; Ervin, E.M. [and others]
英文摘要	Yucca Mountain, which is being studied extensively because it is a potential site for a high-level radioactive-waste repository, consists of a thick sequence of volcanic rocks of Tertiary age that are underlain, at least to the southeast, by carbonate rocks of Paleozoic age. Stratigraphic units important to the hydrology of the area include the alluvium, pyroclastic rocks of Miocene age (the Timber Mountain Group; the Paintbrush Group; the Calico Hills Formation; the Crater Flat Group; the Lithic Ridge Tuff; and older tuffs, flows, and lavas beneath the Lithic Ridge Tuff), and sedimentary rocks of Paleozoic age. The saturated zone generally occurs in the Calico Hills Formation and stratigraphically lower units. The saturated zone is divided into three aquifers and two confining units. The flow system at Yucca Mountain is part of the Alkali Flat-Furnace Creek subbasin of the Death Valley groundwater basin. Variations in the gradients of the potentiometric surface provided the basis for subdividing the Yucca Mountain area into zones of: (1) large hydraulic gradient where potentiometric levels change at least 300 meters in a few kilometers; (2) moderate hydraulic gradient where potentiometric levels change about 45 meters in a few kilometers; and (3) small hydraulic gradient where potentiometric levels change only about 2 meters in several kilometers. Vertical hydraulic gradients were measured in only a few boreholes around Yucca Mountain; most boreholes had little change in potentiometric levels with depth. Limited hydraulic testing of boreholes in the Yucca Mountain area indicated that the range in transmissivity was more than 2 to 3 orders of magnitude in a particular hydrogeologic unit, and that the average values for the individual hydrogeologic units generally differed by about 1 order of magnitude. The upper volcanic aquifer seems to be the most permeable hydrogeologic unit, but this conclusion was based on exceedingly limited data.
出版年	1996
报告类型	Technical Report
语种	英语
国家	美国
来源学科分类	05 NUCLEAR FUELS ; 54 ENVIRONMENTAL SCIENCES ; GROUND WATER ; FLUID FLOW ; YUCCA MOUNTAIN ; HYDROLOGY ; HIGH-LEVEL RADIOACTIVE WASTES ; UNDERGROUND DISPOSAL ; AQUIFERS ; BOREHOLES ; TUFF ; STRATIGRAPHY
URL	http://www.osti.gov/scitech/servlets/purl/437703
资源类型	科技报告
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/266822
推荐引用方式 GB/T 7714	Luckey, R.R.,Tucci, P.,Faunt, C.C.,et al. Status of understanding of the saturated-zone ground-water flow system at Yucca Mountain, Nevada, as of 1995,1996.