ISSN:0020-6024    

DOI:10.1080/02626666809493621

出版商:Taylor & Francis Group    

年代:1968

数据来源: Taylor

摘要:

The purpose of this paper is to present a mathematical method for interpretation and analysis of extreme values of precipitation at a given location on the surface of the earth. The method gives the corresponding distribution functions for the minimum and maximum storms during a sample composed ofnsuccessive storms, wheren= 2, 3, … To check the descriptive capabilities of the method, it has been applied to a 70 year record of rainfall at a precipitation station at Durango, Colorado.

ISSN:0020-6024    

DOI:10.1080/02626666809493622

出版商:Taylor & Francis Group    

年代:1968

数据来源: Taylor

摘要:

A mathematical model is built for monthly river flows of the Orinoco river. The model consists of a cyclic part which explains up to 93% of the total variance of the series of monthly water levels, and a stochastic part which is shown to follow a 1st order autoregressive scheme with a primary variable or random component that behaves as “white noise” and appears to have near 60% chance of coming from a normal population. A time series of flow anomalies is obtained from long term monthly means. Statistical techniques are applied to the series of flow anomalies in order to obtain the mean number of crossings at an arbitrary level during an arbitrary time. There are also studied the mean length of an upward excursion over an arbitrary level and the mean time between successive upcrossings. The actual results for the Orinoco river are in good agreement with the statistical theory showing that this kind of analysis can be extremely useful in the design and planning of reservoir operations. (Key words: hydrology, runoff, statistical analysis.)

ISSN:0020-6024    

DOI:10.1080/02626666809493623

出版商:Taylor & Francis Group    

年代:1968

数据来源: Taylor

摘要:

By considering a conveniently chosen schematization of the flow regime in an unconfined coastal aquifer of large depth a generalization of the Ghyben-Herzberg formula, accounting for the discharge of fresh water towards the sea, is derived.

ISSN:0020-6024    

DOI:10.1080/02626666809493624

出版商:Taylor & Francis Group    

年代:1968

数据来源: Taylor

摘要:

The study of the radioactive snow gauge has been undertaken in Grenoble in 1962 with the objective to develop, up to the routine operation, an automatic solid state electronic snow gauge, radio transmitting every day.

ISSN:0020-6024    

DOI:10.1080/02626666809493625

出版商:Taylor & Francis Group    

年代:1968

数据来源: Taylor

摘要:

Shreve's formulas for topologically random networks are used to calculate mean stream numbers and mean bifurcation ratios for particular values ofn1. The exact values are compared with the Monte Carlo results of Liao and Scheidegger.

ISSN:0020-6024    

DOI:10.1080/02626666809493626

出版商:Taylor & Francis Group    

年代:1968

数据来源: Taylor

摘要:

Spring peak flows recorded over a 25-year period in Benton Creek, a small forested watershed in northern Idaho, were studied in their relation to meteorological events. More peak flows were generated by rain-on-snow than by clear-weather snowmelt; the two types of peaks differ in magnitude and in other characteristics. Two rather simple techniques were used to calculate the generative capacity of a rainfall-temperature event and the hypothetical outflow of water from a snowpack during rainy and rainfree periods. Similar data on spring peaks on two regional subbasins were considered also.

ISSN:0020-6024    

DOI:10.1080/02626666809493627

出版商:Taylor & Francis Group    

年代:1968

数据来源: Taylor

摘要:

Several stream ordering and labeling methods have been proposed in order to describe some aspects of the geometry of river networks; namely, Horton's, Strahler's, Milton-Ollier's, Scheidegger's ordering techniques, and the STORET location coding system. This paper analyzes the topological significance of each of these methods, that is, the amount of information on the topological structure of the net that they can yield. Horton's and Strahler's ordering methods give only numerical information on the distribution of channels among different classes (orders); Milton-Ollier's and Scheidegger's methods give more information, from the topological point of view, as the former assigns a unique label to each stream segment in a network, and the latter takes into account all junctions; the STORET system labels interconnections between channels, but does not use the concept of order and is therefore more suitable for other purposes than for the theoretical study of river nets.

ISSN:0020-6024    

DOI:10.1080/02626666809493628

出版商:Taylor & Francis Group    

年代:1968

数据来源: Taylor

摘要:

It is shown that a thermodynamic analogy can be set up for structurally cyclic as well as for noncyclic river nets that satisfy Horton's law of stream numbers. In the latter case, the microcanonical formalism of statistical thermodynamics has to be used.

ISSN:0020-6024    

DOI:10.1080/02626666809493629

出版商:Taylor & Francis Group    

年代:1968

数据来源: Taylor

摘要:

The non-equilibrium formula of Theis has hitherto been found to be inadequate to analyse drawdown data from open wells, due to the influence of effects of well-storage on early drawdown data. Recently, a reliable type-curve method was proposed by Papadopulos and Cooper to analyse drawdowns in wells of large diameter. In order to study its practical validity, the Papadopulos-Cooper method was applied to drawdown data from six open wells, tapping the alluvial sands of the river Palar, near Madras city, India. The study has indicated that the method has considerable practical utility in analysing drawdown data from large diameter open wells. Besides, the method also offers an easy way of computing the duration over which the effects of well-storage are likely to influence drawdown data, in terms of aquifer transmissibility and well-radius. If a rough idea of aquifer trans-missibility is available from existing data, then, such a computation, to determine the duration over which wellstorage affects drawdown, could be initially made to advantage, so that proper judgement could be exercised in using other conventional methods of analysis, such as that of Jacob or that of Theis. (Key Words: Pumping tests; Open wells; Papadopulos-Cooper method.)

ISSN:0020-6024    

DOI:10.1080/02626666809493630

出版商:Taylor & Francis Group    

年代:1968

数据来源: Taylor