摘要:

An estimate has been constructed of the sea surface, relative to the geoid, in the North Atlantic. The basis of the estimate is the surface geostrophic velocity determined from an inverse solution for the general circulation. The result is broadly consistent with previous surfaces based upon reference levels and with estimates of the longshore, deep‐sea pressure gradients inferred from continental shelf measurements.

ISSN:0149-0419    

DOI:10.1080/15210608109379413

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

The preliminary scheme of Kurilo‐Kamchatka region tsunami zonation was made through numerical calculations by means of shallow water equations. The coast considered is 800 km long. The mean increase of the wave height is 2–3 along the coast, and in several places is up to 5–7. In Kamchatsky Bay the tsunami propagation is estimated. Because of refraction and interference of reflected waves, the level oscillations in the northern part of Kamchatsky Bay are determined mainly by the local bottom topography and the coastline features, while their dependence on the initial source orientation is slow. The calculation shows that the effect of both nonlinearity and friction is of weak influence up to the 10‐m bottom contour. The maximum decrease of height may be evaluated as 13%. In addition, the nomogram is constructed, permitting the determination of the inundation of the dry coast slope depending on the bottom slope and the height of the approaching wave. The determination of the distribution of the wave energy loss along wave paths near Shumshu and Paramushir islands is made. The value of the total reflection coefficient (at some distance from the initial source) has been defined by means of summation of partial reflections at different parts of the wave path. It is found that the zones of maximum reflection are situated mainly in the proximity of the coast where the depth is shallow. By the use of the grids with different space size, some numerical estimations of seiche‐like oscillations are performed for the rectangular closed basin. The natural oscillation periods found by calculations agree well with the values given by analytical solutions. The using of grids of mixed type allows the saving of much time when estimating tsunamis arriving from distant sources by means of calculations.

ISSN:0149-0419    

DOI:10.1080/15210608109379414

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

The Grid Refinement Technique has been used to determine the ray paths followed by tsunamis. This technique is modified to permit the ready determination of both the ray paths and also the wave fronts of the tsunami. This is achieved by considering a variational problem with variable endpoints. Only a slight increase in actual computation is required, but machine storage demands are high. Results are presented for wave front ray path diagrams for both the Tasman Sea and Indian Ocean.

ISSN:0149-0419    

DOI:10.1080/15210608109379415

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

Some important oceanographic results have been obtained with Goddard Earth Models using satellite altimetry. GEM 9 and GEM 10 have been extended through the addition of worldwide GEOS‐3 altimetry to give new solutions, GEM 10B and IOC, fields that are complete in harmonics to degree 36 and 180, respectively. GEM 9 is a field derived solely from satellite tracking observations, whereas GEM 10 is a combination solution containing surface gravimetry. The accuracy of the oceanic geoid for these models has been estimated by using independent altimeter tracks of GEOS‐3. After empirically removing long wavelength orbital errors, residuals of 1.8 m (rms) were obtained for GEM 10, 0.94 m for GEM 10B, while GEM IOC gave 0.75 m.

ISSN:0149-0419    

DOI:10.1080/15210608109379416

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

Fehlerlehre und Ausgleichungsrechnungby Walter Höpcke (Berlin/New York: Walter de Gruyter, 1980), 227 pages, hardcover, DM 78.00

ISSN:0149-0419    

DOI:10.1080/15210608109379417

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

ISSN:0149-0419    

DOI:10.1080/15210608109379418

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

ISSN:0149-0419    

DOI:10.1080/15210608109379412

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor