Twenty-three unsolved problems in hydrology (UPH) – a community perspective

This paper is the outcome of a community initiative to identify major unsolved scientific problems in hydrology motivated by a need for stronger harmonisation of research efforts. The procedure involved a public consultation through on-line media, followed by two workshops through which a large number of potential science questions were collated, prioritised, and synthesised. In spite of the diversity of the participants (230 scientists in total), the process revealed much about community priorities and the state of our science: a preference for continuity in research questions rather than radical departures or redirections from past and current work. Questions remain focussed on process-based understanding of hydrological variability and causality at all space and time scales. Increased attention to environmental change drives a new emphasis on understanding how change propagates across interfaces within the hydrological system and across disciplinary boundaries. In particular, the expansion of the human footprint raises a new set of questions related to human interactions with nature and water cycle feedbacks in the context of complex water management problems. We hope that this reflection and synthesis of the 23 unsolved problems in hydrology will help guide research efforts for some years to come

Stabilization of neutral-type indirect control systems to absolute stability state

This paper provides sufficient conditions for absolute stability of an indirect control Lur’e problem of neutral type. The conditions are derived using a Lyapunov-Krasovskii functional and are given in terms of a system of matrix algebraic inequalities. From these matrix inequalities a sufficient condition for linear state feedback stabilizability follows.Water ManagementCivil Engineering and Geoscience

Introduction and Guide to the Handbook of Water Resources Management: Discourses, Concepts and Examples

This chapter provides the background and rationale of this handbook. It touches upon the main challenges of contemporary water resources management. It guides the reader through the four distinct parts and 25 chapters of the handbook. The structure of this handbook facilitates different disciplinary and thematic perspectives whereby conceptually the review of ongoing discourses, introduction and analysis of concepts and contexts as well as examples to highlight successes and lessons to be learned provide the framework

Introduction and Guide to the Handbook of Water Resources Management: Discourses, Concepts and Examples

This chapter provides the background and rationale of this handbook. It touches upon the main challenges of contemporary water resources management. It guides the reader through the four distinct parts and 25 chapters of the handbook. The structure of this handbook facilitates different disciplinary and thematic perspectives whereby conceptually the review of ongoing discourses, introduction and analysis of concepts and contexts as well as examples to highlight successes and lessons to be learned provide the framework