Dear Colleagues,

Despite many years of scientific development and intensive studies as well as money spent on prevention activities, floods are still a serious threat to many countries, cities, and communities around the world. Flood losses are not as much of a problem in less developed countries, but they are also reasons for many causalities and damages in countries of greater income. There are many examples such as floods this year in Sydney (Australia), Assam (India), some provinces in Colombia, different countries in Africa, and many cities and provinces in China. The previous year has also brought severe inundations in countries of Western Europe such as Belgium and Germany.

Advanced modeling techniques such as hydrologic and hydraulic simulations may provide the necessary support for authorities, decision makers, and ordinary stakeholders. Today we can observe much development in this area. We now have decades of experience in testing different modeling approaches, collecting more sophisticated data, and elaborating methods for more reliable verification and validation of models. The present moment seems to be a good time for linking ideas, models, and algorithms. The reason for the development in this direction is the incredible increase in computer power in recent decades. New multi-threading processors are available in basic laptops, and workstations have become mobile. We have also observed the continuous development of more effective numerical methods; e.g., flexible meshes are replacing regular mesh applications, and effective finite volume schemes are competing with older finite-difference schemes and more complex finite-element methods. Therefore, hydrologic modeling, in deterministic as well as stochastic forms, is more easily combined with advanced hydrodynamic simulations including 2D processes of flow, sediment transport, and others.

The purpose of this issue is to present top-level research in the area of hydrologic and hydraulic model integration. The issue encourages the exchange of new ideas and inspiration for new research in this field.

Dr. Tomasz Dysarz
Dr. Joanna Wicher-Dysarz
Dr. Michael Nones
Guest Editors

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• hydrologic modeling
• hydraulic modeling
• model integration
• flood hazard assessment
• flood risk assessment