摘要:

The quasi‐linear analysis of steady water flow in unsaturated soils involves just two soil parameters, the sorptive number and the (usually saturated) conductivity. The formulation preserves integral capillary flow properties of the soil and yields solutions that are amply accurate for engineering applications. The analog with scattering of plane waves reinforces the utility of the method, making powerful techniques and extant results available from fields such as electromagnetics and acoustics. Solutions for multidimensional infiltration lead to design principles for field permeameters in unsaturated soils. Other applications concern the penetration or non‐penetration of unsaturated seepage flows into macropores, cavities, and tunnels. Limited extensions are possible to heterogeneous and anisotropic soils and to unsteady fl

ISSN:0002-8606    

DOI:10.1029/EO068i011p00153

年代:1987

数据来源: WILEY

摘要:

Below are membership lists for appropriations subcommittees in the 100th Congress that have direct jurisdiction over geophysical research. Last week,Eospublished membership lists for other key congressional committees (Eos, March 10, 1987, p. 138.).Letters to Senate committees should be addressed to the committee, U.S. Senate, Washington, DC 20510; letters to House committees should be addressed to the committee, U.S. House of Representatives, Washington, DC 20515. Initial contacts with committee and subcommittee staff may be valuable. For additional guidelines on contacting a member of Congress or congressional staff, see “AGU's Guide to Legislative Information and Contacts” (Eos, September 30, 1986, p. 7

ISSN:0002-8606    

DOI:10.1029/EO068i011p00154

年代:1987

数据来源: WILEY

摘要:

The research vesselRobert D. Conrad, owned by the U.S. Navy and operated by Lamont‐Doherty Geological Observatory (LDGO) of Columbia University (Palisades, N.Y.), is a multi‐use ship that is principally employed for marine geology and geophysics surveys. For the last 10 years, theConradhas had a multichannel seismic (MCS) capability, which is used to determine deep structure and velocity of the suboceanic crust around the world. While it is expected that the Conrad will be replaced by a new vessel sometime in the 1990s, the needs of current and future projects required that her MCS capability be upgraded and enhanced now. The National Oceanic Reflection Profiling Organization (NORPO) recommended in 1985 that up to $2 million be invested in the immediate upgrading of the MCS capability of the U.S. academic research fleet (see “Marine Multichannel Seismology Workshop ” inEos, February 11, 1986, p. 70). This recommendation bore first fruit in late 1985, when The National Science Foundation (NSF) granted $425,000, matched by $ 100, 000 in Lamont‐Doherty institutional funds, for an upgrade to the seismic source system on

ISSN:0002-8606    

DOI:10.1029/EO068i011p00155-01

年代:1987

数据来源: WILEY