ISSN:0020-6024    

DOI:10.1080/02626666509493399

出版商:Taylor & Francis Group    

年代:1965

数据来源: Taylor

摘要:

The extent of lineative control such as jointing, as expressed in the alignment of the drainage network, can be judged only in comparison with the angularity of a channel system developed in a homogeneous, non-jointed lithology. This “background” value of random deflection of local stream direction from the general direction of the drainage exceeds 30° to either side in about 50% of a given channel length, and may exceed 60° to either side in 10% or more of channel length.

ISSN:0020-6024    

DOI:10.1080/02626666509493400

出版商:Taylor & Francis Group    

年代:1965

数据来源: Taylor

ISSN:0020-6024    

DOI:10.1080/02626666509493401

出版商:Taylor & Francis Group    

年代:1965

数据来源: Taylor

摘要:

The aim of this paper is to expose the principles and methods of the local turning to account of water resources, in giving relief to the contribution of geology. The unit and independence of surface and underground waters lead to carry out a study and research-plan with the purpose harmonizing and coordinating the exploitation of all the hydrological resources.

ISSN:0020-6024    

DOI:10.1080/02626666509493402

出版商:Taylor & Francis Group    

年代:1965

数据来源: Taylor

摘要:

The paper describes some results of a climatic study of the characteristics and decennial frequencies of droughts at a few selected stations in the three dry climatic zones—arid, semi-arid and dry sub-humid—of India. The classification of the climates was done according to the 1955 water balance scheme of Thornthwaite, after a careful mapping of the moisture indices for all the climatological observatories in India. Four stations in the arid, six from the semi-arid and from the dry sub-humid zones were selected for the analytical study of droughts.

ISSN:0020-6024    

DOI:10.1080/02626666509493403

出版商:Taylor & Francis Group    

年代:1965

数据来源: Taylor

摘要:

It is shown that the forward Kolmogorov equation, as applied to dispersion processes, can be deduced as a special case from general non-equilibrium statistical mechanics in which there is a non-negative constant of the motion. For Markov processes, this constant can be taken as the integral over the whole system of the joint-probability density, and hence a master equation, identical to the forward Kolmogorov equation, follows for the latter.

ISSN:0020-6024    

DOI:10.1080/02626666509493404

出版商:Taylor & Francis Group    

年代:1965

数据来源: Taylor

摘要:

The dynamic equation of motion that governs the laminar flow of water through soils is the empirical equation of Darcy. According to Darcy's equation the velocity of the flowing water is proportional to the hydraulic gradient under which the water is flowing, with the constant of proportionality being the coefficient of permeability. The interesting question arising is whether or not the coefficient of permeability is a scalar quantity (having only a magnitude) or a vector (having both magnitude and direction). It is proved, in the present paper, that the permeability coefficient is neither a scalar nor a vector but a symmetric tensor of second rank. The fact that the permeability tensor is symmetric gives rise to great simplifications and permits a simple graphical construction of the tensor ellipsoid. Having the tensor ellipsoid, the determination of the direction at which the water will flow under a known imposed hydraulic gradient can be found graphically. In case of isotropic soils (the permeability coefficient has the same value along any direction) the ellipsoid reduces to a sphere and the tensor becomes a scalar. In the general case of anisotropic soils the permeability tensor is an entity with nine elements, six of which are independent representing pure extension or contraction along the three principal coordinate axes, thus transforming the permeability sphere into an ellipsoid and vice versa. It should be noted that in anisotropic soils the only directions along which the flow takes place in the direction of the hydraulic gradient are those of the principal axes of the tensor ellipsoid.

ISSN:0020-6024    

DOI:10.1080/02626666509493405

出版商:Taylor & Francis Group    

年代:1965

数据来源: Taylor

ISSN:0020-6024    

DOI:10.1080/02626666509493406

出版商:Taylor & Francis Group    

年代:1965

数据来源: Taylor

ISSN:0020-6024    

DOI:10.1080/02626666509493407

出版商:Taylor & Francis Group    

年代:1965

数据来源: Taylor

ISSN:0020-6024    

DOI:10.1080/02626666509493408

出版商:Taylor & Francis Group    

年代:1965

数据来源: Taylor