Hidrológiai Közlöny 1975 (55. évfolyam)
4. szám - Könyvismertetés
R eiser O.: Az esözteíő szivattyútelepek Hidrológiai Közlöny 1975. 4. sz. 145 dieser auch in stabilisierten Betriebszuständen vorhandenen, sowohl auf das Rohrnetz als auch auf die Pumpenanlage zurückführbaren Druckunterschiede und ihre betrieblichen und wirtschaftlichen Nachteile. Bei der Besprechung der auch über die Pumpenanlago durchführbaren Verringerungsmöglichkeiten, wird auch auf die durch Anwendung von — Regulierung mit Drosselung — Druckregelung -— Anwendung von Pumpen verschiedener Grösse — Modifizierung der Instrumentierung — Pumpen mit flachen Kennkurven und — Regulierung der Drehzahl ausführbaren automatisierten Pumpenanlagen eingegangen. Aufgrund des Vergleichs dieser Lösungen wird die Aufmerksamkeit der Hersteller und Verbraucher auf die einfache und dennoch erfolgreiche Lösung und Anwendung von Pumpen mit flacher Kennkurve, auf ihre verschiedenen technischen Bedingungen und erreichbaren wirtschaftlichen Vorteile gelenkt. Weiters werden die Beschränkungsmöglichkeiten des Druckbereichs besprochen, die durch Beibehaltung der auch bisher eingebauten Instrumentierungen und Pumpen und in erster Reiche durch die wiederholte Inbetriebsetzung der Grundpumpen erreichbar sind. Weiters wird als optimale Lösung dieses Themas die automatische Drehzahländerung und ihre für die Beregnung am besten entsprechende Regulierungsart, sowie die Anwendung der in jede Hauptleitung eingebauten „von der Abflussmenge korrigierten Druckwertnehmung" erörtert. Die Ausführungen werden im allgemeinen durch eingefürte Betriebserfahrungen und aufgrund der gemessenen Kennkurven angefertigte Diagramme bestätigt. KÖNYVISMERTETÉS Sediment transport in alluvial streams by János BOGÁRDI, Akadémiai Kiadó, Budapest, 1974. (p 826) The English edition of the book is based on a previous Hungarian version published in 1971, but some parts received amendments and have been slightly changed. The works is a comprehensive volume on fluvial sediment transport, a general review is presented on the relations between sediment transport and river training, as well as on silting of reservoirs, on scouring in the vicinity of structures and sediment measurement. The subject matter of the book "The theory of sediment transportation" written by the author in 1954 — 55 is in this sense somewhat restricted in the new volume, but this is more than amply offset by the thoroughness of treatment which refelects the advances achieved in the intervening period in this field. A considerable merit of the book is that the individual approach developed by the author on the basis of his original investigations and studies could be succesfully amalgamated with the wealth of information gained from the relevant international literature, submitting at the same time the latter to sound criticism and analysis as a result of which often apparently conflicting theories could be reconciled into a uniform pictures. The basis underlying this approach is axact physical description. The significance of the present book exceeds the domain of sediment transportation in that, by application of the general transport equations, a model exymple is given for the successful applications, of advances in branches of science other than sediment transportation and at the same time to other hydraulic phenomena. The discussion of numerous results attained abroad together with the relevant references and bibliography contribute to making the book a fundamental source of information for these interested in particular problems all over the world. It should be emphasized as a special merit of this book — particularly for scientists and investigators dealing with sediment transportation problems — that the question associated with hydraulic similarity are analysed from a new approach. Of great significance is the summary presented on the model laws relating to alluvial streams, including distorted models, for wich the author could rely on his on his personal achievements. The novel application of the transport equations should be received with interest by the international expert public. The contents of the book can be classified into three main parts, namely those on the theory of sediment transportation, the interrelation existing between sediment and the stream and the practical interpretation of observations. Of these, the first part is the largest, covering 460 pages, the second and third extending to 230 and 65 pages respectively. The detailed bibliography covers an additional 22 pages. Within the first main part, the fundamentals of investigations related to sediment and the movement thereof, the theories concerned with the movement of bed-load, and suspended sedimest are described. In connection with bedload transport, special mention must be made of the variable critical tractive forces and the laws of variable critical velocities, which are the results of recent investigations by the author. The general transport equations have been applied first by the author to the study of suspended sediment transportation. The second main part is devoted to empirical relationships, to the hydraulic parameters of sediment and the water-course, to regime theory and the interrelations between sediment movement and river regulation, as well as to the laws governing hydraulics similarity in sediment transportation. Fron the aspect .of theory, this discussion of similarity may be regarded as of basic importance in that the expressions derived from the valance equations for the condition euqtions ensuring the similarity of alluvial streams are discussed here for the first time in the relevant international literature. Practical interpretation of sediment observation is given in the third part and it serves for demonstrating the practical use of some formulae and methods reviewed in the second part where examples originated mainly from Hungarian sources can be similarly found. A historical review of sediment measurements and research in Hungary is presented in the third main part, listing also the achievements thereof. Sediment transportation in rivers in Hungary is illustrated through measurement data, the processing, analysis and representation of the data obtained, giving simultaneously an example for such work. It should also be significant for teaders abroad since the data published on sediment transportation may be compared with those on rivers elsewhere, thus permitting valuable parallels to be drawn and checks to be made on methodology. In this manner it may contribute to the generalisation of regularities observed. The present book may prove to be of benefit beyondthe circle of hydraulic engineers engaged in river training e.g. to those dealing with water-treatment, to geologists and geographers and to those performing hydraulic model tests. Intersting new results in one of the conventional fields of Hungarian seienctific activity are presented in this book on sediment transportation, thus contributing to the general advancement of this brach of science. The publishing house of the Academy is therefore to be congratulated for the decision to publish this volume in English with the support of the Research Institute for Water Resources Development. It has thus made an important result of Hungarian research in hydrology and hydraulics accessible to the international scientific public. Ö. Starosolszky
