Deploy diverse renewables to save tropical rivers.

A strategic mix of solar, wind and storage technologies around river basins would be safer and cheaper than building large dams, argue Rafael J. P. Schmitt, Noah Kittner and colleagues

How eco is eco-tourism? A systematic assessment of resorts on the Red Sea, Egypt

Eco-tourism is a growing part of the tourism industry. However, there are no agreed-upon criteria of what constitutes eco-tourism, so the industry is currently self-identified, with eco-lodges simply declaring themselves so. Here we present the first systematic comparison of eco-tourism versus conventional (or mass) tourism, using as our study area a set of 37 resorts along the southern Red Sea coast of Egypt, all constructed on similarly oriented parcels between the sea and the Red Sea Mountain Range. We compared resorts based on their water, energy, and waste management (all virtually equivalent), and based on mappable environmental parameters such as swimming pool surface area, distance from mangrove patches, conflict with flood plains, extent of lawn area, and means of access to deep water. We found that the self-identified eco-tourism establishments were not significantly different from the conventional tourism resorts in terms of their stress on environmental resources. We recommend that future eco-tourism operations be modified in two key ways. First, on the planning level, by modifying the regional master plan created by the central government tourism authorities. Second, on the site design level, by introducing significant improvements to the design approval processes for the developments to ensure compliance with environmental requirements

Restoring Rivers and Floodplains for Habitat and Flood Risk Reduction: Experiences in Multi-Benefit Floodplain Management From California and Germany

Conventional flood control has emphasized structural measures such as levees, reservoirs, and engineered channels—measures that typically simplify river channels and cut them off from their floodplain, both with adverse environmental consequences. Structural measures tend to be rigid and not easily adapted to increased flooding regimes resulting from environmental change. Such actions also limit the natural hydrologic benefits of floodplains such as storing floodwaters, improving water quality, providing habitat for invertebrates and fish during periods of inundation, and supporting a multitude of cultural services. As these benefits are more widely recognized, policies are being adopted to encourage projects that reduce flood risks and restore floodplain ecosystems, while acknowledging the social-ecological context. The number of such projects, however, remains small. We assessed four multi-benefit floodplain projects (two in California, United States, and two in Germany) and characterized their drivers, history, and measures implemented. In both United States cases, the dominant driver behind the project was flood risk reduction, and ecosystem restoration followed, in one case inadvertently, in the other as a requirement to receive a subsidy for a flood risk reduction project. One German case was motivated by ecosystem restoration, but it was more widely accepted because it also offered flood management benefits. The fourth case was conceived in terms of balanced goals of flood risk reduction, ecosystem restoration, and recreation. We conclude that projects that both reduce flood risk and restore ecosystems are clearly possible and often cost-effective, and that they could be more widely implemented. The principal barriers are often institutional and regulatory, rather than technical

Biomic river restoration: A new focus for river management

River management based solely on physical science has proven to be unsustainable and unsuccessful, evidenced by the fact that the problems this approach intended to solve (e.g., flood hazards, water scarcity, and channel instability) have not been solved and long‐term deterioration in river environments has reduced the capacity of rivers to continue meeting the needs of society. In response, there has been a paradigm shift in management over the past few decades, towards river restoration. But the ecological, morphological, and societal benefits of river restoration have, on the whole, been disappointing. We believe that this stems from the fact that restoration overrelies on the same physical analyses and approaches, with flowing water still regarded as the universally predominant driver of channel form and structural intervention seen as essential to influencing fluvial processes. We argue that if river restoration is to reverse long‐standing declines in river functions, it is necessary to recognize the influence of biology on river forms and processes and re‐envisage what it means to restore a river. This entails shifting the focus of river restoration from designing and constructing stable channels that mimic natural forms to reconnecting streams within balanced and healthy biomes, and so levering the power of biology to influence river processes. We define this new approach as biomic river restoration

Risk as a process: a history informed hazard planning approach applied to the 2018 post-fire debris flows, Montecito, California

Historical information about floods is not commonly used in the US to inform land use planning decisions. Rather, the current approach to managing floods is based on static maps derived from computer simulations of the area inundated by floods of specified return intervals. These maps provide some information about flood hazard, but they do not reflect the underlying processes involved in creating a flood disaster, which typically include increased exposure due to building on flood-prone land, nor do they account for the greater hazard resulting from wildfire. We developed and applied an approach to analyze how exposure has evolved in flood hazard zones in Montecito, California, an area devastated by post-fire debris flows in January 2018. By combining historical flood records of the past 200 years, human development records of the past 100 years, and geomorphological understanding of debris flow generation processes, this approach allows us to look at risk as a dynamic process influenced by physical and human factors, instead of a static map. Results show that floods after fires, in particular debris flows and debris laden floods, are very common in Montecito (15 events in the last 200 years), and that despite policies discouraging developments in hazard areas, developments in hazard zones have increased substantially since Montecito joined the National Flood Insurance Program in 1979. We also highlight the limitation of using conventional Flood Insurance Rate Maps (FIRMs) to manage land use in alluvial fan areas such as Montecito. The knowledge produced in this project can help Montecito residents better understand how they came to be vulnerable to floods and identify action they are taking now that might increase or reduce their vulnerability to the next big flood. This science-history-centric approach to understand hazard and exposure evolution using geographic information systems (GIS) and historical records, is generalizable to other communities seeking to better understand the nature of the hazard they are exposed to and some of the root causes of their vulnerabilities, in other words, both the natural and social processes producing disasters

How Eco is Eco-Tourism? A Systematic Assessment of Resorts on the Red Sea, Egypt

Eco-tourism is a growing part of the tourism industry. However, there are no agreed-upon criteria of what constitutes eco-tourism, so the industry is currently self-identified, with eco-lodges simply declaring themselves so. Here we present the first systematic comparison of eco-tourism versus conventional (or mass) tourism, using as our study area a set of 37 resorts along the southern Red Sea coast of Egypt, all constructed on similarly oriented parcels between the sea and the Red Sea Mountain Range. We compared resorts based on their water, energy, and waste management (all virtually equivalent), and based on mappable environmental parameters such as swimming pool surface area, distance from mangrove patches, conflict with flood plains, extent of lawn area, and means of access to deep water. We found that the self-identified eco-tourism establishments were not significantly different from the conventional tourism resorts in terms of their stress on environmental resources. We recommend that future eco-tourism operations be modified in two key ways. First, on the planning level, by modifying the regional master plan created by the central government tourism authorities. Second, on the site design level, by introducing significant improvements to the design approval processes for the developments to ensure compliance with environmental requirements