preface

The availability of freshwater is one of the great issues facing mankind today - in some ways the greatest, because problems associated with it affect the lives of many millions of people, and it has attracted a wide scale international attention of UN Agencies and related international/regional governmental and non-governmental organisations. The rapid growth of population coupled to steady increase in water requirements for agricultural and industrial development have imposed severe stresses on the available freshwater resources in terms of both the quantity and quality, requiring consistent and careful assessment and management of water resources for their sustainable development.

Development and practical applications of isotope methodologies in water resources assessment and management has been part of the IAEA’s programme in nuclear applications over the last four decades. Isotope applications to a wide spectrum of hydrological problems related to both surface and groundwater resources as well as environmental studies in hydro-ecological systems are presently an established scientific discipline often referred to as “Isotope Hydrology”. The IAEA contributed to this development through direct support to research and training, and to the verification of isotope methodologies through field projects implemented in Member States.

The world-wide programme of International Hydrological Decade (1965-1974) and subsequent long-term International Hydrological Programme (IHP) of UNESCO has been one of the well recognised international frameworks for scientific research, education and training in the field of hydrology. International Atomic Energy Agency (IAEA) and UNESCO have established a close co-operation within the framework of both the earlier IHD and the ongoing IHP in the specific aspects of scientific and methodological developments related to water resources that are of mutual interest to the programmes of both organisations. The first benchmark publication on isotope hydrology entitled “Guidebook on Nuclear Techniques in Hydrology” was realised in 1983 through the activity of the joint IAEA/UNESCO Working Group on Nuclear Techniques established within the framework of IHP, and it has been widely used as practical guidance material in this specific field.

In view of the fact that the IHP’s objectives include also a multi-disciplinary approach to the assessment and rational management of water resources and taking note of the advances made in isotope hydrology, the IAEA and UNESCO have initiated a joint activity in preparation of a series of six textbooks.

This series covers the entire field of hydrological applications of natural isotopes (environmental isotopes) to the overall domain of water resources and related environmental studies. The main aim of these six volumes is to provide a comprehensive review of basic theoretical concepts and principles of isotope hydrology methodologies and their practical applications with some illustrative examples. These volumes, as a whole, provide the required information on the basic concepts and their applications in sufficient detail. They are designed to be self-sufficient reference material for scientists and engineers involved in research and/or practical applications of isotope hydrology as an integral part of the investigations related to water resources assessment, development and management. Furthermore, they are also expected to serve as “Teaching Material” or text books, to be used in universities and teaching institutions for incorporating the study of "isotopes in water" in general into the curriculum of the earth sciences.

These six volumes have been prepared through efforts and contributions of a number of scientists involved in this specific field as cited in each volume, under the guidance and co-ordination of the main author/co-ordinating editor designated for each Volume.  W.G.Mook (Netherlands), J.Gat (Israel), K.Rozanski (Poland),  W.Stichler (Germany), M.Geyh (Germany), K.P.Seiler (Germany) and Y.Yurtsever (IAEA, Vienna) were involved as the main author/co-ordinating editors in preparation of these six volumes, respectively. Final editorial work on all volumes to achieve consistency in the contents and layout throughout the whole series was undertaken by W.G.Mook (Netherlands).

Mr.Y.Yurtsever, Staff Member of the Isotope Hydrology Section of the IAEA; and Ms. A.Aureli, Programme Specialist, Division of Water Sciences of UNESCO were the Scientific Officers in charge of co-ordination and providing scientific secretariat to the various meetings and activities that were undertaken throughout the preparation of these publications.

The IAEA and UNESCO thank all those who have contributed to the preparation of these volumes and fully acknowledge the efforts and achievements of the main authors/co-ordinating editors.

It is hoped that these six volumes will contribute towards wider scale applications of isotope methodologies for improved assessment and management of water resources, facilitate incorporation of isotope hydrology into the curricula of teaching and education in water sciences and also foster further developments in this specific field.

 

Vienna/Paris, March 2000