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排序方式： 共有146条查询结果，搜索用时 15 毫秒
71.
Olocenic alluvial aquifer of the River Cornia coastal plain (southern Tuscany, Italy): database design for groundwater management 总被引：1，自引：0，他引：1
P. Barazzuoli M. Bouzelboudjen S. Cucini L. Kiraly P. Menicori M. Salleolini 《Environmental Geology》1999,39(2):123-143
Hydrogeological research is in progress, utilizing GIS methods, with the principal aim of modelling the Olocenic alluvial
aquifer of the River Cornia coastal plain (southern Tuscany, Italy), which has been exploited for drinking water, irrigation,
and industrial uses. A consequence of exploitation has been the appearance of wide seawater intrusion. The alluvial aquifer
has recently been subjected to new well fields for the supply of drinking water, with an increase of total average discharge
of about 4×106 m3/year. This paper presents results obtained from updating and integrating basic knowledge and structuring the database. The
hydrogeological study allowed the recognition of the extension of areas that are characterized by a hydraulic head under the
sea level, the progressive salinization of the aquifer, and the increase of water deficit in the aquifer which is produced
by a progressive extraction of water superior to the natural recharge. In addition, benefits and disadvantages resulting from
the location of new well fields in a hydrogeologically favourable zone, and the boundary conditions for much of the area studied
have been defined. The GIS was used as support for making and updating the tabular and spatial database with the aim of integrating
the local and regional hydrogeological knowledge. This study will permit the realization of a numerical simulation of the
groundwater flow of the aquifer aimed at correcting the management of water resources, by means of the GIS-modelling integration.
Received: 23 June 1998 · Accepted: 16 November 1998 相似文献
72.
A. N. Voronov 《Environmental Geology》2000,39(5):477-481
The Russian Federation has many aquifers and these possess a wide range of chemical compositions. In Russia about 300 mineral
water sources have been developed as spas and health resorts. More than 150 of them produce bottled mineral water. A brief
historical revue is given. The study of mineral waters in Russia began as far back as the reign of Peter the Great (1682–1725).
It has been prolonged by works of many Russian scientists.
The details of the chemical composition of the different types of Russian mineral waters and some geological aquifer peculiarities
are described. The most widely used classification of mineral waters in Russia is presented. The present condition of these
waters and the government standards laid down for their use are described. Examples of different mineral waters are given.
Received: 14 April 1998 / Accepted: 8 December 1998 相似文献
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This paper introduces the alternating conditional expectation (ACE) algorithm of Breiman and Friedman (J Am Stat Assoc 80:580–619,
1985) for estimating the transformations of a response and a set of predictor variables in multiple regression problems in hydrogeology.
The proposed nonparametric approach can be applied easily for estimating the optimal transformations of different hydrogeological
data to obtain maximum correlation between observed variables. The approach does not require a priori assumptions of a functional
form, and the optimal transformations are derived solely based on the data set. The advantages and applicability of this new
approach to solve different multiple regression problems in hydrogeology or in Earth Sciences are illustrated by means of
theoretical investigations and case studies. It is demonstrated that the ACE method has certain advantages in some fitting
problems of hydrogeology over the traditional multiple regression. Based on our knowledge, this is the first application of
the ACE algorithm to analyze and interpret groundwater data. 相似文献
77.
T. A. Kireeva 《Moscow University Geology Bulletin》2009,64(1):50-53
This paper discusses the problems of separating the endogenous components of deep groundwater. We suggest utilizing the boron/bromine ratio for determining the endogenous components in groundwater from the lower levels of the sedimentary cover. This paper suggests methods for calculating the boron/bromine and boron/chlorine ratios for brines in ancient platforms, and thermal water in tectonically active regions and in regions of present active volcanism. 相似文献
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Nakka vagu, a tributary of the River Manjira in the Medak district of Andhra Pradesh, has a catchment area of ∼500 km2. Patancheru is an industrial development area (IDA) near the vagu. There are about 350 industries of varied nature (pulp,
plastic, bulk drugs, pharmaceuticals, paints and steel rolling mills) that are engaged in the manufacture/processing of their
respective products and that use water extensively. The hydrogeological setup has a bearing on the widespread contamination
in the area because of discharge of industrial effluents into open land and streams. Several dug wells and boreholes situated
in the study area have been monitored for water level fluctuations and quality variations. Pumping tests have been conducted
to evaluate aquifer parameters. The geology, drainage, chemistry and other related anthropogenic factors play a major role
in the spread of pollution in the area. Hence, it is very important to determine the degree of vulnerability to pollution
based on hydrogeological factors. Amidst the granite terrain, the Nakka vagu has been identified as a paleo-channel (composed
of clay–silt–sand facies); its presence in the area has immensely increased the spread of groundwater contamination. The transmissivity
of the alluvial aquifer varies from 750 to 1315 m2/day. The adjoining granite has a transmissivity that varies from 30–430 m2/day. The thickness of the valley fill in the discharge region is about 10–12 m, with a lateral spread of 500–700 m, east
of Nakka vagu.
Received: 17 November 1999 · Accepted: 14 March 2000 相似文献