ISSN:0017-467X    

DOI:10.1111/j.1745-6584.1976.tb03634.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

ABSTRACTData obtained from observation–well programs are used to determine (1) the effect of withdrawals on recharge and natural discharge conditions, (2) the hydraulic characteristics of ground–water systems, and (3) the extent and degree of confinement of aquifers. Wells in these programs can usefully be divided into three networks: (1) a hydrologic network which includes wells needed to determine the extent of aquifers and changes in storage, (2) a water–management network which includes wells needed to determine the effect of withdrawals and hydraulic characteristics, and (3) a baseline network which includes wells needed to determine the response of ground–water systems to natural changes such as those related to

ISSN:0017-467X    

DOI:10.1111/j.1745-6584.1976.tb03635.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

ABSTRACTIn areas where the bedrock is irregular, depressions in the bedrock formation can yield significantly higher amounts of water because the aquifer has a greater saturated thickness. Finding these areas by drilling test holes is a common practice but one that can be conducted more economically if an efficient search procedure is utilized. This paper describes such a technique called the Fibonacci Search and shows that it can save thousands of dollars in the cost of drilling test holes when compared to “brute‐force” me

ISSN:0017-467X    

DOI:10.1111/j.1745-6584.1976.tb03636.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

ISSN:0017-467X    

DOI:10.1111/j.1745-6584.1976.tb03637.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

ABSTRACTThe abundance and relative purity of ground water guarantees its increase in usage. In some localities, the content of iron and manganese in ground water is so high that these metals must be removed before the water can be used for drinking or industrial purposes.Iron occurs in two states of oxidation in nature–the divalent (ferrous) and trivalent (ferric) forms. The Vyredox method developed in Finland and used now also in Sweden and some other countries oxidizes the ferrous ion, which is soluble in water, to the ferric ion, which is insoluble, before the water enters the well.The Vyredox method achieves a high degree of oxidation in the strata around the well. The method makes use of iron‐oxidizing bacteria and aeration wells. A number of aeration wells are placed in a ring around the supply well. Water is forced down the aeration wells but first it is degassed and then enriched with oxygen. The oxygen‐rich water provides a suitable habitat for the iron‐oxidizing bacteria which assist in the oxidation of ferrous iron. The process must be repeated at specific time intervals to avoid further increases of iron content.The process of precipitating iron in the aquifer has only a slight effect on aquifer permeability. Cloggage of the aquifer surrounding the well should not occur for a period many times longer than the life span of a typic

ISSN:0017-467X    

DOI:10.1111/j.1745-6584.1976.tb03638.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

ABSTRACTThe drainage basin of Barbadoes Pond, Madbury and Dover, southeastern New Hampshire, was studied by seismic refraction and magnetic measurements as part of an interdisciplinary investigation. The purpose of the geophysical measurements was to provide boundary conditions (bedrock and water–table elevations) for a mathematical model of ground–water flow. The basin is intensively used for recreation, municipal water supply, and sand and gravel mining.Barbadoes Pond is a kettle lake lying in the middle of a broad, flat–topped sand and gravel hill (a “kame plain”). The plain is surrounded by marine clay at a lower elevation.A broad, deep, northwest–southwest trending trough underlies the plain according to seismic refraction measurements (45 lines) and water wells. The present form and location of the trough are attributed to glacial enlargement of a stream valley eroded along a bedrock shear zone. The bedrock topography and seismic velocity are directly related to erosion resistance of the vertically dipping metasedimentary bedrock. Magnetic anomalies are consistent with the seismic results.Water–table elevation correlates with bedrock elevation, not surface elevation. This is a consequence of highly permeable sand and gravel, the principal surfical materials. Apparently the pond is not hydraulically independent of nearby wells and a large reservoir.The results invite speculation that kame plains occur over bedrock troughs. Such a relationship, if generally true, would speed search for good well sites in this region of rapid population growth and industria

ISSN:0017-467X    

DOI:10.1111/j.1745-6584.1976.tb03639.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

ABSTRACTAn analytical solution obtained for unsteady flow to a cavity well has been simplified for finding the aquifer characteristics, i.e. coefficient of storage and transmissivity. In the analysis presented here the relationships become fairly simple for the close approximation of the unsteady state solution.

ISSN:0017-467X    

DOI:10.1111/j.1745-6584.1976.tb03640.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

ISSN:0017-467X    

DOI:10.1111/j.1745-6584.1976.tb03641.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

ISSN:0017-467X    

DOI:10.1111/j.1745-6584.1976.tb03643.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY