ALBERT

Description / Table of Contents: PREFACE The papers contained in the present volume were prepared from the contributions presented during an international Advanced Workshop held in Santander, Cantabria, Spain between 1-5 November 1989. The workshop was a joint activity of the Working Group on Geology and Land-Use Planning (program "Geology and Environment", UNESCO), the Commission on Applied Quaternary Research (INQUA), the Sub-Commission on Maps of Environmental Geology (Commission of the Geological Map of the World) and the Grupo Españiol de Geología Ambiental y Ordenación del Territorio (Spanish Association for Environmental Geology and Land-Use Planning). The aims of the meeting were to discuss a series of topics in which the four participating scientific bodies share an interest, to analyze the existing problems and trends and to identify certain lines along which work and/or actions will be particularly necessary in the near future. It was expected that the discussions and the conclusions of the meeting would provide useful guidelines for earth scientists working on environmental problems and for other professionals and officials who deal with environmental analysis, planning and management, either on a scientific basis or in a decision-making capacity...

Description / Table of Contents: INTRODUCTION The International Summer School of Theoretical Geodesy on Satellite Altimetry in Geodesy and Oceanography was held in Trieste (Italy) from May 25 to June 6, igg2. It was organized by Prof. R. Rummel of the Delft University of Technology and by Prof. F. Sansò of the Politecnico di Milano and was attended by 63 participants and 7 lecturers from 17 countries. The School was hosted by the International Centre of Theoretical Physics of Trieste. Satellite altimetry provides a lot of data that require more and more sophisticated models in order to be interpreted and exploited. One of the main problems related to the practical treatment of the data can be summarized as follows: oceanographers would like to ask geodesists to compute precise orbits and a precise geoid in order to put into evidence the Sea Surface Topography that can be interpreted as an oceanographic signal related to currents and to several physical parameters; on the other hand, geodesists would like to ask oceanographers to a-priori determine the Sea Surface Topography, in order to be able to extract from the altimeter data the geoid and the orbit errors to be used in the gravity field modelling. The solution to this dilemma can only be found in a cooperative frame. An integrated model to be used for a single-step treatment of altimetry is probably far to be defined, so at present geodesists and oceanographers must cooperate to obtain step-wise and iterative modelling of the gravity field and of the oceanographic phenomena. This is precisely the reason why the school on Satellite Altimetry was organized on an interdisciplinary basis...

Description / Table of Contents: Digital signal processing has become more and more an integral part of observational seismology. While it offers unprecedented power in extracting information from seismic signals, it comes at the price of having to learn a variety of new skills. Dealing with digital seismic data requires at least a basic understanding of digital signal processing. Taking the calculation of true ground motion as the guiding problem, this course covers the basic theory of linear systems, the design and analysis of simple digital filters, the effect of sampling and A/D conversion and an introduction to spectral analysis of digital signals. It contains a number of examples and exercises that can be reproduced using the PITSA software package (Scherbaum and Johnson 1993) or similar programs.

Description / Table of Contents: PREFACE There are problems, when applying statistical inference to the analysis of data, which are not readily solved by the inferential methods of the standard statistical techniques. One example is the computation of confidence intervals for variance components or for functions of variance components. Another example is the statistical inference on the random parameters of the mixed model of the standard statistical techniques or the inference on parameters of nonlinear models. Bayesian analysis gives answers to these problems. The advantage of the Bayesian approach is its conceptual simplicity. It is based on Bayes' theorem only. In general, the posterior distribution for the unknown parameters following from Bayes' theorem can be readily written down. The statistical inference is then solved by this distribution. Often the posterior distribution cannot be integrated analytically. However, this is not a serious drawback, since efficient methods exist for the numerical integration. The results of the standard statistical techniques concerning the linear models can also be derived by the Bayesian inference. These techniques may therefore be considered as special cases of the Bayesian analysis. Thus, the Bayesian inference is more general. Linear models and models closely related to linear models will be assumed for the analysis of the observations which contain the information on the unknown parameters of the models. The models, which are presented, are well suited for a variety of tasks connected with the evaluation of data. When applications are considered, data will be analyzed which have been taken to solve problems of surveying engineering. This does not mean, of course, that the applications are restricted to geodesy. Bayesian statistics may be applied wherever data need to be evaluated, for instance in geophysics. After an introduction the basic concepts of Bayesian inference are presented in Chapter 2. Bayes' theorem is derived and the introduction of prior information for the unknown parameters is discussed. Estimates of the unknown parameters, of confidence regions and the testing of hypotheses are derived and the predictive analysis is treated. Finally techniques for the numerical integration of the integrals are presented which have to be solved for the statistical inference. Chapter 3 introduces models to analyze data for the statistical inference on the unknown parameters and deals with special applications. First the linear model is presented with noninformative and informative priors for the unknown parameters. The agreement with the results of the standard statistical techniques is pointed out. Furthermore, the prediction of data and the linear model not of full rank are discussed. A method for identifying a model is presented and a less sensitive hypothesis test for the standard statistical techniques is derived. The Kalman-Bucy filter for estimating unknown parameters of linear dynamic systems is also given. Nonlinear models are introduced and as an example the fit of a straight line is treated. The resulting posterior distribution for the unknown parameters is analytically not tractable, so that numerical methods have to be applied for the statistical inference. In contrast to the standard statistical techniques, the Bayesian analysis for mixed models does not discriminate between fixed and random parameters, it distinguishes the parameters according to their prior information. The Bayesian inference on the parameters, which correspond to the random parameters of the mixed model of the standard statistical techniques, is therefore readily accomplished. Noninformafive priors of the variance and covariance components are derived for the linear model with unknown variance and covariance components. In addition, informative priors are given. Again, the resulting posterior distributions are analytically not tractable, so that numerical methods have to be applied for the Bayesian inference. The problem of classification is solved by applying the Bayes rule, i.e. the posterior expected loss computed by the predictive density function of the observations is minimized. Robust estimates of the standard statistical techniques, which are maximum likelihood type estimates, the so-called M-estimates, may also be derived by Bayesian inference. But this approach not only leads to the M-estimates, but also any inferential problem for the parameters may be solved. Finally, the reconstruction of digital images is discussed. Numerous methods exist for the analysis of digital images. The Bayesian approach unites some of them and gives them a common theoretical foundation. This is due to the flexibility by which prior information for the unknown parameters can be introduced. It is assumed that the reader has a basic knowledge of the standard statistical techniques. Whenever these results are needed, for easy reference the appropriate page of the book "Parameter Estimation and Hypothesis Testing in Linear Models" by the author (Koch 1988a) is cited. Of course, any other textbook on statistical techniques can serve this purpose. To easily recognize the end of an example or a proof, it is marked by a A or a t~, respectively. I want to thank all colleagues and students who contributed to this book. In particular, I thank Mr. Andreas Busch, Dipl.-Ing., for his suggestions. I also convey my thanks to Mrs. Karin Bauer, who prepared the copy of the book. The assistance of the Springer- Verlag in checking the English text is gratefully acknowledged. The responsibility of errors, of course, remains with the author.

Description / Table of Contents: This volume contains the proceedings of a symposium held at Freiburg im Breisgau, October 7-11, 1990. The symposium was sponsored mainly by the Deutsche Forschungsgemeinschaft (DFG), by the Geological Institute of the University of Freiburg, and by the International Association of Mathematical Geology. We thank these and all other sponsors of the meeting. The symposium whose participants came from more then twenty countries was the first international meeting dedicated entirely to geological applications of threedimensional computer graphics, a rapidly growing field of scientific visualization in geology. The selection of papers in this volume covers a wide range of methods developed in the last decade.

Description / Table of Contents: The present study will provide an introduction into the biomechanics of trees and will give a critical survey of the phylogeny and the constructional principles of the tree habit. Since the trunk is considered the basic and crucial element of a tree, the analysis is largely restricted to a functional comparison of the stem anatomy of the various tree forms. It is based on the concept of constructional morphology, thus considering simultaneously the functional aspect and the ontogenetical and phylogenetical development of the various trunk types. The main questions to be answered in this study are; Why do trees exist? - Which are the constructional principles of tree trunks and when and in which group of plants do they appear? - How important are internal (phylogenetic) and external (functional, constructional) constraints? - What are the specific properties of the different constructional principles and does a correlation between trunk design and growth habit exist? - Is there a tendency in phylogeny to a better performance? The study does not (and cannot) intend to provide a detailed biophysical analysis of individual cases because experimental data on the mechanical properties of the structural elements of the different kinds of trees are still lacking. Instead, it will he the task to evaluate in a comprehensive and qualitative or semi-quantitative manner the available data of the morphology, anatomy and phylogeny of fossil and recent trees by using concepts of biomechanics and constructional morphology. Thus a somewhat holistic approach is used, which is becoming increasingly more acceptable today.

Description / Table of Contents: INTRODUCTION The study is essentially empirical, since it portrays and appraises two different water management systems, and relates them to one another. Yet the analysis has also been made with definite research aims in mind. Its focus has been narrowed down to the environmental assessment of urban water management systems in arid and semi-arid regions, especially with an eye to deal with information problems in the Developing World. The study addresses a set of very critical issues of global concern, and, thus, delineates a crucial topic for international research. The fact that a wide range of critical issues usually complicates and aggravates the given problem setting provides the comparative analysis with a special practical incentive to explore the opportunities for joint strategies and comprehensive solutions. However, the complexities involved between water management and the environment and the relative lack of a joint theory in that field pose certain difficulties to such an undertaking. In order to fully appreciate the underlying purpose of the study and the scope of its implications, the various facets of the problem setting and the essential ingredients of the general line of approach have first to be unravelled and expounded at some length. Above all, it needs to be shown how these facets combine to produce the complex, burning issues which in turn seem to, both in theory and practice, require correspondingly intricate, strategic approaches for their solutions...

Description / Table of Contents: PREFACE Turbidity currents have been comprehensively studied in the past although much remains unknown about both their flow characteristics and resultant sedimentary deposits. Much of this uncertainty arises from the catastrophic nature of their formation which makes them difficult to study in the environment, and has resulted in the majority of studies being experimental or theoretical. Experiments have shown that reversals in the flow of density currents can be associated with the generation of internal solitary waves. This is in contrast to the belief held by many workers that the reversal of a turbidity current simply generates an identical flow travelling in the opposite direction. This book arose from the need for a detailed experimental study to examine the effects and to consider the consequences of density current reversals from a variety of obstructions to their flow. The first part of this book comprises a detailed review of literature covering the fluid dynamics and sedimentology relevant to the experimental study (chapter one). Chapter two presents the results from the comprehensive experimental programme which are discussed and compared with appropiate theoretical hypotheses. This permits the synthesis of a model for the general features of flows that result from the incidence of density currents upon obstructions to the flow. The application of this model to both modern and ancient turbidite systems is then discussed in chapter three. This book is suitable for earth scientists with an interest in the dynamics of turbidity currents. In addition, workers from other fields such as applied maths, meteorology and engineering who have an interest in density currents and bores in practical situations may find it useful...

Description / Table of Contents: 1. Introduction --- 2. Biology of leptocephali --- 2-1. Developmental stages --- 2-2. Morphological features --- 2-3. Sensory organs --- 2-4. Feeding ecology --- 2-5. Physiology and energetics --- 2-6. Growth of leptocephali --- 2-7. Metamorphosis --- 2-8. Swimming behavior --- 3. Zoogeography of leptocephali --- 3-1. Taxonomic groups of eels --- 3-2. Spawning areas of eels --- 3-3. Distribution and abundance of leptocephali --- 3-4. Seasonal occurrence of leptocephali --- 4. Ecology of leptocephali --- 4-1. Depth distribution and vertical migration --- 4-2. Survival and predation --- 4-3. Recruitment behavior --- 5. General discussion and future perspectives --- 5-1. Biology of leptocephali --- 5-2. Leptocephalus growth --- 5-3. Zoogeography and diversity of leptocephali --- 5-4. The leptocephalus larval strategy --- 5-5. Oceanic changes and leptocephalus recruitment --- 5-6. Ecological significance of leptocephali in the surface layer --- 5-7. Future research perspectives

Description / Table of Contents: 1. General introduction --- 2. Morphological development of sensory and swimming organs and the central nervous system in the striped jack --- 2-1. Introduction --- 2-2. Materials and methods --- 2-2A. Materials --- 2-2B. Morphology --- 2-2C. Histology of eye, lateral line, muscle, bone and the central nervous system --- 2-3. Results --- 2-3A. Morphology --- 2-3B. Relative growth --- 2-3C. Ossification --- 2-3D. Muscle --- 2-3E. Eye --- 2-3F. Cephalic and trunk lateral lines --- 2-3G. The central nervous system --- 2-4. Discussion --- 2-4A. Morphological development related to swimming ability --- 2-4B. Development of sensory organs --- 2-4C. Development of the central nervous system --- 3. Ontogeny of schooling behavior and other behavioral traits in the striped jack --- 3-1. Introduction --- 3-2. Materials and methods --- 3-2A. Phototaxis --- 3-2B. Rheotaxis --- 3-2C. Optokinetic response --- 3-2D. Schooling behavior --- 3-2E. Association with floating objects --- 3-3. Results --- 3-3A. Phototaxis --- 3-3B. Rheotaxis --- 3-3C. Optokinetic response --- 3-3D. Schooling behavior --- 3-3E. Association behavior --- 3-4. Discussion --- 3-4A. Development of taxis in relation to sensory and swimming organs --- 3-4B. Ecological speculations on survival strategy and migratory behavior --- 4. Critical involvement of the central nervous system for the development of schooling behavior revealed by docosahexaenoic acid deficiency experiments --- 4-1. Introduction --- 4-2. Materials and methods --- 4-2A. Effect of dietary DHA on the growth, survival, and brain development in the striped jack --- 4-2B. Effect of dietary condition on behavior --- 4-2C. Incorporation of DHA into the central nervous system --- 4-3. Results --- 4-3A. Effect of dietary DHA on the growth, survival, and brain development in the striped jack --- 4-3B. Effect of dietary condition on the schooling behavior of yellowtail --- 4-3C. Incorporation of DHA into the central nervous system in the yellowtail --- 4-4. Discussion --- 5. Ontogeny of association behavior between jack mackerel and jellyfish --- 5-1. Introduction --- 5-2. Materials and methods --- 5-2A. Feeding on jellyfish --- 5-2B. Utilization of jellyfish as a prey collector --- 5-2C. Utilization of jellyfish as a refuge from predators --- 5-2D. Ontogenetic changes in the function of association between jack mackerel and jellyfish --- 5-2E. Underwater observation of fish assemblages associated with jellyfish --- 5-3. Results --- 5-3A. Feeding on jellyfish --- 5-3B. Utilization of jellyfish as a prey collector --- 5-3C. Utilization of jellyfish as a refuge from predators --- 5-3D. Ontogenetic changes of the function of association between jack mackerel and jellyfish --- 5-3E. Underwater observation of fish assemblages associated with jellyfish --- 5-4. Discussion --- 5-4A. Ontogeny of function in the association behavior of jack mackerel with jellyfish --- 5-4B. Ontogeny of mechanisms in associating with jellyfish --- 6. Behavioral ontogeny of common pelagic fishes with reference to the population replacement --- 6-1. Introduction --- 6-2. Materials and methods --- 6-2A. Fish husbandry --- 6-2B. Swimming speed --- 6-2C. Anti-predator performance --- 6-3. Results --- 6-3A. Growth --- 6-3B. Swimming speed and anti-predator performance --- 6-4. Discussion --- 6-4A. Growth performance of hatchery-reared pelagic fish larvae and comparison to wild conspecifics --- 6-4B. Swimming speeds in the context of feeding ecology --- 6-4C. Inter-specific difference of the ontogeny of anti-predator performance --- 6-4D. Environmental factors as a driving force of population replacement --- 7. General discussion: Towards the sustainable management of fisheries resources --- 7-1. Implications of ontogenetic study for the fisheries resource management --- 7-2. Perspectives for the sustainable management in fisheries resources