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The new scientific decade (2023-2032) of the International Association of Hydrological Sciences (IAHS) aims at searching for sustainable solutions to undesired water conditions – whether it be too little, too much or too polluted. Many of the current issues originate from global change, while solutions to problems must embrace local understanding and context. The decade will explore the current water crises by searching for actionable knowledge within three themes: global and local interactions, sustainable solutions and innovative cross-cutting methods. We capitalise on previous IAHS Scientific Decades shaping a trilogy; from Hydrological Predictions (PUB) to Change and Interdisciplinarity (Panta Rhei) to Solutions (HELPING). The vision is to solve fundamental water-related environmental and societal problems by engaging with other disciplines and local stakeholders. The decade endorses mutual learning and co-creation to progress towards UN sustainable development goals. Hence, HELPING is a vehicle for putting science in action, driven by scientists working on local hydrology in coordination with local, regional, and global processes. [ABSTRACT FROM AUTHOR]

Problems of water system integration occur when a model's boundaries are too narrow to capture interactions and feedbacks across the terrestrial water cycle. We propose that integrated water systems models are required to overcome them and are necessary to understand emergent system behaviour, to expand model boundaries, to evaluate interventions, and to ensure simulations reflect stakeholder goals. We present the Water Systems Integrated Modelling framework (WSIMOD) software as one such approach and describe its theoretical basis, covering the node and arc nature of simulations, the integration framework that enables communication between model elements, and the model orchestration to customise interactions. We highlight data requirements for creating such a model and the potential for future development and refinement. WSIMOD offers a flexible and powerful approach to represent water systems, and we hope it will encourage further research and application into using model integration towards achieving sustainable and resilient water management. [ABSTRACT FROM AUTHOR]

While the land use‐street network nexus is well acknowledged, evidence for the one‐way impacts of land‐use patterns on street accessibility is still inadequate. The measurements of land‐use patterns and street accessibility lack systematic knowledge. Their empirical correlations also lack geographical variability, constraining site‐specific land‐use practices. Therefore, this study overcame the aforementioned limitations by examining the two‐level spatial models to formulate accessibility‐oriented land plans, using a well‐developed Chinese city as an example. Firstly, two landscape metrics—Euclidean Nearest‐Neighbor Distance (ENN) and Similarity Index (SIMI)—were used to quantify the intra‐ and inter‐land‐use configurations, respectively. Both city‐level and local accessibility were measured using spatial design network analysis. Performing both ordinary least squares (OLS) and geographically weighted regression (GWR) models, results identified the statistically significant effects of inter‐land‐use patterns on two‐level street accessibility. An exception was that land‐use configurations within residential and industrial regions were irrelevant to street accessibility. We also found GWR was a better‐fitting model than OLS when estimating locally‐varied accessibility, suggesting hierarchical multiscale land‐use planning. Overall, locally heterogeneous evidence in this study can substantialize land use‐street network interactions and support the decision‐making and implementation of place‐specific accessibility‐oriented land use. [ABSTRACT FROM AUTHOR]

Problems of water system integration occur when a model's boundaries are too narrow to capture interactions and feedbacks across the water cycle. We propose that integrated water systems models are required to overcome them, and are necessary to understand emergent system behaviour, to expand model boundaries, to evaluate interventions, and to ensure simulations reflect stakeholder goals. We present the Water Systems Integrated Modelling Framework (WSIMOD) software as one such approach and describe its theoretical basis, covering the node and arc nature of simulations, the integration framework that enables communication between model elements, and the model orchestration to customise interactions. We highlight data requirements for creating such a model and the potential for future development and refinement. WSIMOD offers a flexible and powerful approach to represent water systems, and we hope it will encourage further research and application into using model integration towards achieving sustainable and resilient water management. [ABSTRACT FROM AUTHOR]