International Association of Hydrological Sciences (IAHS)

G JS3: Earth Rotation: An Interdisciplinary Approach to Earth System Science (IAG, IAMAS, OCEANS, IASPEI, IAGA, IAHS, SEDI)

The modern approach to understanding Earth rotation irregularities deals with interacting physical constituents as diverse as a liquid, magnetic core, a visco-elastic mantle, and liquid and gaseous external layers, each with internal motions and responding to external forces. The global character of the observational evidence is a major challenge to theoreticians who develop dynamical models of the behavior of each layer. No single theory can explain the complete set of observed irregularities. The monitoring of Earth rotation itself includes the participation of worldwide space geodetic and astronomical programs, leading to intensive international cooperation. The symposium will focus on those aspects of Earth rotation studies that imply, or even create, bridges between scientific disciplines. Lead Convener: M. Feissel (IAG), Observatoire de Paris, Central Bureau, International Earth Rotation Service, 61, Avenue d'Observatoire, F-75014 Paris (FRANCE); tel: +33-1-4051-2226; fax: +33-1-40-51-22-91; e-mail: Co-conveners: D. Cartwright (UK), R. Hide (UK), R. Sabadini (ITALY), J. Wahr (USA), P. Brosche (GERMANY).

PS JS1: Ocean-Atmosphere Coupling TOGA/COARE (OCEANS/IAMAS/IAHS)

This symposium will communicate results of recent observational and modeling efforts to understand the continuum of air-sea interactions that take place in the Western Pacific warm pool, from microscale turbulent fluxes of heat, moisture, and momentum across the interface to the mesoscale and synoptic-scale motions in the ocean and atmosphere that modulate these fluxes. Timescales of interest range from a few minutes to a few years, with emphasis on nonstationary processes. A particular objective is to address issues of scale interactions, with the intent to improve parameterizations of subgrid-scale processes in coupled ocean-atmosphere models. Emphasis will be on results derived from TOGA/COARE. However, selected papers of different origin, but addressing air-sea interaction processes of importance in TOGA/COARE, will be included. Lead Convener: Yoshiaki Toba, Faculty of Science, Tohoku University, Physical Oceanography, Laboratory, Sendai 980-77 (JAPAN); tel: +81-22-245-3695; fax: +81-22-227-3671. Co-conveners: Peter J. Webster (USA), Roger Lukas (USA), Yury A. Volkov (RUSSIA), Greg J. Holland (AUSTRALIA).

PS JS2: Sea Level and Ice-Sheet Volume Changes As Geophysical Indicators (OCEANS, IAG, IAHS)

Sea level variations occur across a wide spectrum of space and time scales: from global to local and from millions of years to minutes. This session will highlight the wide range of geophysical causes, and the implications of sea level changes. It will also emphasize how many of them are interrelated. Lead Convener: David T. Pugh, Institute of Oceanographic Sciences, Deacon Laboratory, Brook Road Wormley, Godalming, Surrey, GU8 5UB (UK); tel: +44-428-684141; fax: +44-428-685637/683066; telex: 858833 OCEANS G; Omnet: D.PUGH; e-mail: Co-conveners: Suzanna Zerbini (ITALY), Mark F. Meier (USA).

S JS6 Rock Properties Related To Environmental Concerns (IASPEI, IAHS, SEG)

A knowledge of the properties of rocks is of great importance in the extraction of mineral and fossil resources as well as in the design, monitoring, and remediation of nuclear and toxic waste sites. Major projects for the characterization of potential and active nuclear waste sites exist in several countries. Much work on rock and soil properties for the design of these facilities and mine safety has been done and will be the focus of this symposium. The safety of these facilities depends not only on the steady state properties of rocks and soils, but also very importantly on their time dependence and on the processes active within and acting upon these materials. Changes in permeability, elastic properties, electrical properties, corrosion, etc., in response to changes in physical and chemical environments will be presented from field as well as laboratory studies. Lead Convener: G. A. Sobolev, Institute of Physics of the Earth, Russian Academy of Sciences, Molodezhnaya 3, Moscow 117 296 (RUSSIA); tel: +7-095-930-0546; fax: +7-095-930-5509; telex: 411478 SGC SU; e-mail: Co-conveners: S. Ingebritsen (USA), G. Olhoeft (USA), H. Spetzler (USA).

V JS3: Volcanic Crater Lakes (IAVCEI, IAHS)

Crater lakes offer a unique opportunity to monitor the evolution of a volcano. When a volcano is in its active phase, a crater lake can be used to monitor changes in heat flow and chemistry which may forewarn of renewed activity, and as activity dies away, a crater lake can be used to monitor that decline. Crater lakes can also represent a major hazard: on the one hand they may be physically unstable and on the other they may contain large quantitites of toxic gas_either way they can pose a serious threat to their immediate environment. Lead Convener: Sam Freeth, Geological Hazards Research Unit, University College of Swansea, Swansea SA2 8PP (UK); tel: +44-792-295522; fax: +44-792-205556; e-mail: Co-convener: F. van de Ven (IAHS) (NETHERLANDS).

H JS1: Clouds, Convection, and Land Surface Processes (IAHS, IAMAS)

This symposium will address a number of related and multidisciplinary topics important to the improvement of the parameterization of sub-grid atmospheric and land surface processes in atmospheric models. Results being produced by international projects such as GEWEX and BAHC will be presented. After an integrating opening session, the symposium will follow four themes: (1) tatus of land-surface process models (PILPS and RICE), coordinated by Ann Henderson-Sellers; (2) land-surface process model development, coordinated by Alfred Becker, and (3) clouds fields and radiative properties, coordinated by Erhard Raschke. The symposium and related workshops (see below) have been approved by the Bureaus of IAHS and IAMAS. The symposium will be coordinated with WCRP/GEWEX, IGBP/BAHC, WMO, UNESCO and UNEP, ICASVR (lead Committee on behalf of IAHS), ICRSDT, ICWRS, and the relevent IAMAS commissions. For simplicity, all correspondence should be addressed to the Lead Convener. Lead Convener: John Schaake, (IAHS), National Weather Service, Office of Hydrology, W/0H3; 1325 East-West Highway, Silver Spring, MD 20910 (USA); tel: 1-301-713-1660; fax: 1-301-713-0963. Co-convener: A. Henderson-Sellers (AUSTRALIA) (IAMAS).

H 1: Effects of Scale On Interpretation and Management of Sediment and Water Quality (ICCE and ICWQ)

Water resources managers have increasing concerns regarding issues of sediment and stream water quality. The objective of this symposium is to evaluate the relations among sediment, water quality, and scale, both temporal and spatial. The primary topics include (1) scale effects on processes, for example, comparability of dominant processes across land scale units affected by different inputs of precipitation; (2) monitoring; (3) modeling at different scales; and (4) management tools, practices, and their effectiveness. Lead Convener: Waite Osterkamp, U.S. Geological Survey, 1675 West Anklam Road, Tucson, AZ 85745 (USA);
tel: 1-602-670-6821 Ext. 28; fax: 1-602-670-6806.

H 2: Models for Assessing and Monitoring Groundwater Quality (ICGW and ICASVR)

The primary goal of this symposium is to explore the scientific issues associated with designing and developing programs for monitoring and assessing groundwater quality. Topics to be examined include (1) development, validation, and application of groundwater flow and contaminated transport models; (2) simulation, optimization, and/or statistics-based techniques for designing data collection networks for groundwater quality assessment; (3) programs for large-scale (regional and national) groundwater quality assessment; (4) interpretive techniques for evaluating water quality data and characterizing ground water quality; (5) the use of groundwater quality assessments for evaluating and formulating groundwater policy; and (6) retrospective analyses of past groundwater quality studies. Both theoretical and applied contributions aimed at assessing and monitoring groundwater quality are welcome and will be published as a Symposium Proceedings. Lead Convener: Brian Wagner, U.S. Geological Survey, 345 Middlefield Road, Menlo Park, CA 94025 (USA); tel: 1-415-329-4567; fax: 1-415-329-4463. Co-convener: T. H. Illangasare (USA), K. Jensen (DENMARK).

H 3: Biogeochemistry of Seasonally Snow-Covered Catchments (ICSI, ICWQ, and ICT)

The topics that will be examined in this Symposium include (1) snowpack transformation and atmospheric interactions, including mass, energy, and chemistry; physical and chemical snowpack processes, and scaling snow properties; (2) snow hydrology and hydrochemistry, spatial distribution of snow and its chemistry, snowmelt models and chemical hydrographs, and chemical elution from the snowpack; (3) snowmelt runoff and biogeochemical processes, snowpack-soil interactions, biotic interactions, and influences on surface-water quality; and (4) hydrologic flow paths in snow and glacial systems, identification and quantification of flow paths, natural and applied tracers, and biogeochemical transformations and processes. Lead Convener: Kathy Tonnessen, National Biological Survey, c/o NPS-Air, P.O. Box 25287, Denver, CO 80225 (USA); tel: 1-303-969-2738; fax: 1-303-987-6699. Co-convener: Mark Williams (USA).

H 4: Tracer Technology for Hydrologic Systems

Investigations of hydrological systems using tracer techniques are based on a standard methodology. However, the investigations of each hydrological subsystem requires specific techniques for field procedures and the evaluation of the data. Special attention will be directed to the mathematical approaches of transport processes. The symposium will examine the following subthemes: (1) mathematical models in tracer hydrology; and (2) tracer technologies for surface water, unsaturated zone and vegetation, ground water, sediment transport, and catchment processes. Convener: Chris Leibundgut, Department of Hydrology, L. A. University: Werderring, 4, D-7800 Freiburg (GERMANY); tel: +49-761-2033531; fax: +49-761-2033575.

H 5: Man's Influence On Freshwater Ecosystems and Water Use (ICSW, ICGW, and ICWQ)

This symposium is focussed on the impact of man on the hydrological and chemical regime of the river and on the resulting effects of water use and ecology. Themes to be addressed include (1) biological responses to changes in flow and chemistry; (2) groundwater-surface water interactions and effects on quantity and quality; (3) water allocation; (4) eutrophication and generation of runoff; (5) waste-water management; and (6) reservoir operation. Convener: Geoffrey E. Petts, School of Geography, University of Birmingham, Edgbaston, Birmingham, B15 2TT (UK); tel: +44-21-414 5518/5538; fax: +44-21-414-5528.

H 6: Modeling and Management of Sustainable Basin-Scale Water Resource Systems (ICWRS)

Participants in this symposium are invited to contribute new ideas and modelling methods as well as application examples for successfully addressing sustainable water resource systems at a basin scale. Contributions are invited in order: (1) to define criteria; (2) to report on modelling water quality and quantity; and (3) to report on recent developments of management aids. Main topics of the symposium are (1) sustainable water quantity and quality management issues and examples: water use, reservoirs, monitoring water quantity and quality, and management strategies; (2) sustainable modelling of water quantity and quality: risk and uncertainty, validation of models, modelling tools, use of Geographic Information Systems (GIS), use of expert systems, decision support systems, and integration of different tools. Convener: S. P. Simonovic, Department of Civil Engineering, The University of Manitoba, Winnepeg, R3T 2N2 (CANADA); tel: 1-204-474-6443; fax: 1-204-261-9534.

H JW1: Remote Sensing Algorithms in Hydrology 1CRSDT (IAHS, IAMAS)

Major topics of the workshop will be evapotranspiration, soil moisture, and snow-water equivalent. A context with GEWEX activities, perhaps GCIP, should be sought. Lead Convener: Richard Armstrong (IAHS), CIRES, Campus Box 449, University of Colorado, Boulder, CO 80309 (USA); tel: 1-303-492-1818; fax: 1-303-492-2468. Co-convener: A. Chedin (FRANCE).

H JW2: Large-Scale Modelling of the Hydrological Cycle in Mountainous Regions_IAHS/WMO Working Group for GEWEX (IAHS, IAMAS)

Mountains exert substantial influence upon the continental-scale fractures of the hydrological cycle and they contribute, sometimes crucially, to available water resources of various climatic zones. This workshop is conceived as a contribution to GEWEX and is geared to seeking a better understanding and improved modelling of the larger-scale features of the complex hydrometeorological processes of mountainous regions. Lead Convener: Herbert Lang, (IAHS), Institute of Geography, ETH, Winterhurerstrasse 190, CH-8057 Zurich (SWITZERLAND); tel: +01-257-52-31; fax: +01-362-51-97. Co-convener: Hugh Davis (Switzerland).

H JW3: Dynamic Monitoring and Estimation of the Water Balance of the Globe and Its Continents (IAHS, IAMAS, ICSW)

This workshop will consider techniques for dynamic monitoring and estimation of water fluxes over the continents and the oceans at regional to global scales. Topics suited to this workshop are intercomparison of models with observations; results from regional-to-global-scale observational and modelling studies of water vapor transport; techniques for data manipulation and visualization; results from GEWEX activities including GCIP, GVAP, and GEWEX Asian Monsoonal Experiment (GAME), and scaling issues in flux parameterizations. Lead Convener: Kendal McGuffie, (IAMAS), Department of Applied Physics, University of Technology, Sydney, P.O. Box 123, Broadway NSW 2007 (AUSTRALIA); tel: +61-2-330-2204; fax: +61-2-330-2219. Co-convener: Klaus Wilke (IAHS), (GERMANY), Bill Lau (USA).

H W1: Spatial Information Systems in Hydrology (ICRSDT)

This workshop will consider international and national issues related to production, dissemination, and acquisition of geographic data sets for hydrology. International speakers will be sought on topics that include (1) standards for producing and documenting geographic data sets; (2) coordination of spatial hydrological data within the national, state, or province, and local government sectors, and the private sector; (3) dissemination of spatial hydrological data sets, including policy for cost recovery; (4) case studies of spatial hydrological data sets; and (5) the need for production of "standard" spatial hydrological data sets for research purposes. Lead Convener: Kenneth J. Lanfear, U.S. Geological Survey, 12201 Sunrise Valley Drive, MS 407, Reston, VA 22092 (USA); tel: 1-703-648-6852; fax: 1-703-648-5295. Co-conveners: D. Nebert (USA), A. Ivan Johnson (USA).

H W2: Predictability, Uncertainty, and Prejudice in Hydrology (ICWRS)

Topics of this workshop might include (1) prediction in the presence of precise and nonprecise inputs; (2) uncertainty due to the random nature of natural systems; (3) uncertainty due to nonprecise data; and (4) the use of techniques/models which are preferred to others on the basis of inadequate analysis. Convener: C. Cunnane, Department of Engineering Hydrology, University College, Galway (IRELAND); fax: +353-91-24913.

H W3: Hydrology and Water Resources of Developing Economies in the Light of Global Change (ICSW)

The workshop will present scientific analyses which in turn form a firm basis for policy choices in the development of hydrology and water resources. The topics to be addressed will include; (1) regional patterns of impacts of climate change on hydrological processes and water resources; (2) forecasting of hydrological hazards_floods and droughts; (3) integrated development of river basins and rational allocation of water resources; (4) soil water balance and management in dry climates; (5) design and operation of sustainable water projects in a changing environment; and (6) vulnerability and problems of urban water resources management. Convener: L. Oyebande, Hydrology Laboratory, Department of Geography and Planning, Faculty of Environmental Sciences, Box 160, Unilag Post office, Akoka, Lagos 698 (NIGERIA); tel: +44-61-792-8950; fax: +234-1-821801; telex: 20117 Nitel TDS NG Box 224.

H W4 Quality Assurance in Hydrological Measurements (ICWRS)

Hydrometric agencies require quality assurance and quality control programs and network planning to effectively and efficiently deliver hydrometric data for a broad range of applications, each with different quality requirements. In addition, technology offers a range of opportunities and potential problems in the collection, processing, management, and presentation of hydrometric data. Topics of the workshop include (1) quality requirements (accuracy, precision, resolution, and timeliness) for different uses; (2) accuracy and precision of alternative technologies to measure water levels and streamflow; (3) error analysis and the propagation of errors in hydrometric practice from field data acquisition, through data processing and data management to presentation of streamflow data and statistics; (4) application of computer technologies; and (5) management aspects of implementing an effective quality assurance/quality control program. Convener: Henry R. Hudson, Regional Sediment Specialist, Environmental Conservation Branch, Environment Canada, 513-269 Main Street,Winnipeg, Manitoba (CANADA) R3C 1B2; tel: 1-204-984-3415; fax: 1-204-983-4506.

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IUGG XXI General Assembly