Monitoring Small Water Bodies Using High Spatial and Temporal Resolution Analysis Ready Datasets

Basemap and Planet Fusion—derived from PlanetScope imagery—represent the next generation of analysis ready datasets that minimize the effects of the presence of clouds. These datasets have high spatial (3 m) and temporal (daily) resolution, which provides an unprecedented opportunity to improve the monitoring of on-farm reservoirs (OFRs)—small water bodies that store freshwater and play important role in surface hydrology and global irrigation activities. In this study, we assessed the usefulness of both datasets to monitor sub-weekly surface area changes of 340 OFRs in eastern Arkansas, USA, and we evaluated the datasets main differences when used to monitor OFRs. When comparing the OFRs surface area derived from Basemap and Planet Fusion to an independent validation dataset, both datasets had high agreement (r2 ≥ 0.87), and small uncertainties, with a mean absolute percent error (MAPE) between 7.05% and 10.08%. Pairwise surface area comparisons between the two datasets and the PlanetScope imagery showed that 61% of the OFRs had r2 ≥ 0.55, and 70% of the OFRs had MAPE <5%. In general, both datasets can be employed to monitor OFRs sub-weekly surface area changes, and Basemap had higher surface area variability and was more susceptible to the presence of cloud shadows and haze when compared to Planet Fusion, which had a smoother time series with less variability and fewer abrupt changes throughout the year. The uncertainties in surface area classification decreased as the OFRs increased in size. In addition, the surface area time series can have high variability, depending on the OFR environmental conditions (e.g., presence of vegetation inside the OFR). Our findings suggest that both datasets can be used to monitor OFRs sub-weekly, seasonal, and inter-annual surface area changes; therefore, these datasets can help improve freshwater management by allowing better assessment and management of the OFRs.

‘The past is always in front of us’: Locating Historical Māori Waterscapes at the Centre of Discussions of Current and Future Freshwater Management

This chapter examines the historical waterscapes of Indigenous Māori iwi (tribes) and hapū (sub-tribes) in the Waipā River (Aotearoa New Zealand). We highlight some of the principles of Te Ao Māori (the Māori world) that shaped Māori understandings and engagements with their ancestral waters and lands prior to colonisation. We explore how the arrival of Europeans resulted in Māori embracing new technologies, ideas, and biota, but always situating and adapting these new imports to fit within their Indigenous ontologies and epistemologies. In contrast, British colonial officials were unwilling to embrace such cross-cultural learnings nor allow Te Ao Māori to peacefully co-existent with their own world (Te Ao Pākehā). Military invasion, war, and the confiscation of Māori land occurred, which laid the foundations for environmental injustices.

Rethinking Freshwater Management in the Context of Climate Change: Planning for Different Times, Climates, and Generations

In this chapter, we explore environmental justice as an intergenerational imperative for Indigenous peoples by examining how different conceptions of time shape responses to climate change. We offer insights into how bringing Māori, Indigenous people of Aotearoa New Zealand, understandings of time can open new spaces for thinking about and planning for climate change in ways that do not reinforce and rearticulate the multiple environmental injustices (disproportionately experienced by Indigenous peoples because of settler colonialism). We examine how Māori concepts of time (as a spiral) and kaitiakitanga (environmental guardianship) challenge the dominant framing of climate change (premised on anthropometrism and forward-thinking temporality) and provide the opportunity to consider how climate justice (encompassing both mitigation and adaptation) as involving intergenerational responsibilities to both human and more-than-human beings.

The connectivity dilemma in freshwater management: exploring the role of street level bureaucrats in water governance

Connectivity is key in freshwater management, e.g. to ensure viable populations of fish, but restoring it may cause the spread of invasive species. Goal conflicts of this kind are common in freshwater management, and the burden of addressing them rests on the shoulders of street-level bureaucrats, i.e. public officials at the end of the policy chain. This study uses a theoretical framework to explore their management choices employing previous research on natural resource management. The findings, based on qualitative semi-structured interviews with street-level bureaucrats from all water districts in Sweden, show that the three factors explored – their understanding of formal policy, their implementation resources, and their policy beliefs – matter when anthropogenic connectivity barriers are considered in ongoing management. Additionally, the factors are interrelated in a way that can obstruct the implementation of policy goals. While connectivity issues rank high and are considered a great problem all over the country, invasive species are regarded as a relatively small problem. If this should change in the future, the level of preparedness is low, primarily due to restricted implementation resources, but also due to the absence of guidance and formal responsibilities.

Comprehensive Study on Freshwater Ecosystem Health of Lancang River Basin in Xishuangbanna of China

The Lancang-Mekong River significantly affects the livelihood of residents in the basin as well as the lives of people in other regions of the world in terms of great development potential and its economic and ecological values. In the meanwhile, the river attracts the attention of countries in the basin and the international community because it raises potential for international conflicts. The Lancang-Mekong River leaves China from Xishuangbanna and the ecosystem status in Xishuangbanna constitutes one of the top concerns related to the basin. The study comprehensively evaluates the status of freshwater ecosystem health of the Lancang River in Xishuangbanna for the first time, with reference to aspects of ecosystem vitality, ecosystem services, as well as governance and stakeholders, firstly, linking the ecosystem and the benefits it provides as well as human activities as an organic whole. The methodology used, Freshwater Health Index, is newly developed and constitutes revision of the first attempt of its usage. Basically, the freshwater ecosystem in the studied area and period remains healthy according to the research, and the ecosystem is considered to be capable of providing sufficient services and benefits to meet the economic and societal development demands. Recommendations are proposed for more sustainable local freshwater management and utilization accordingly.

Understanding Complexity in Freshwater Management: Practitioners’ Perspectives in The Netherlands

Ecosystems have been stabilized by human interventions to optimize delivery of certain ecosystem services, while at the same time awareness has grown that these systems are inherently dynamic rather than steady state. Applied research fields have emerged that try to increase adaptive capacity in these ecosystems, using concepts deriving from the theory of complex adaptive systems. How are these concepts of complexity interpreted and applied by practitioners? This study applies a mixed-methods approach to analyze the case of freshwater management in The Netherlands, where a management paradigm promoting nature-fixating interventions is recently being replaced with a new paradigm of nature-based solutions. We find that practitioners have widely varying interpretations of concepts and of how the ecosystems they work in have evolved over time when described with complex system attributes. This study allows for the emergence of key complexity-related considerations among practitioners that are not often discussed in literature: (i) the need for physical and institutional space for self-organization of nature; (ii) the importance of dependency and demand management; and (iii) trade-offs between robustness and flexibility. This study, furthermore, stresses the importance of using practitioners’ views to guide applied research and practice in this field.

Multidisciplinary classification of Canadian river reaches to support the sustainable management of freshwater systems

Climate change is altering the hydrology of Canadian rivers to an unprecedented degree. Consequently, sustainable freshwater management practices need to adapt, which include the development of integrated water resource strategies and environmental flow recommendations. A particular challenge arises for these assessments due to the highly diverse nature of river ecosystems across Canada. This diversity can be addressed by using a classification system to create manageable spatial units. Building upon and adapting the results of a global river reach classification scheme, we present a multidisciplinary K-means clustering approach to categorize all river reaches of Canada into 23 types at fine spatial resolution. The typology is based on classifier variables related to hydrology, mostly derived from modelled long-term means of monthly discharges, physiography, climate, and fluvial geomorphology. Resulting maps provide baseline information for rivers of all size classes, from small headwater streams to very large rivers, across the entire country, including unmonitored regions such as the High Arctic. The classification system also points to some strategic expansion opportunities for the current Canadian monitoring network of river gauging stations.