排序方式: 共有39条查询结果,搜索用时 265 毫秒
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Marjan van den Belt Daniella Blake 《Journal of the American Water Resources Association》2015,51(6):1581-1599
We observe a paradigm shift toward collaborative, multi‐level (from local to global) water management and suggestions for scale‐related design principles in the literature. Decision‐support tools are needed that can help achieve scale design principles. Mediated modeling (MM) refers to model building with people, rather than for people. This tool belongs to a family of participatory, systems oriented tools. This article explores their suitability for addressing challenges and principles that arise at multiple‐scales. MM can promote the understanding of cross‐level and cross‐scale links, creating salient, credible, and legitimate knowledge and encouraging boundary functions. Prerequisites for successful MM processes include an openness and willingness to collaborative learning. As new “meso‐level” institutions emerge to address complex challenges in water management collaboratively, tools like MM may play an important role in structuring dialogues, developing adaptive management capacity and advance an ecosystem services approach. 相似文献
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Diane Van Opstal Karin E.M. Diderich Marieke Joosten Lutgarde C.P. Govaerts Joke Polak Marjan Boter Jasper J. Saris Wai Yee Cheung Stefanie van Veen Robert van de Helm Attie T.J.I. Go Maarten F.C.M. Knapen Dimitri N.M. Papatsonis Anneke Dijkman Femke de Vries Robert-Jan H. Galjaard Lies H. Hoefsloot Malgorzata I. Srebniak 《黑龙江环境通报》2018,38(12):911-919
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Marjan van den Belt Thomas Bowen Kimberley Slee Vicky Forgie 《Journal of the American Water Resources Association》2013,49(3):681-692
We present a simulation model developed to communicate a potential investment trap associated with using man‐made river engineering to protect built infrastructure. A small system dynamics model in STELLA? was constructed following a collaborative model‐building process to increase understanding among stakeholders of the role natural capital plays in wealth creation. We set out to explore the dynamic relationship between investing tax revenue in natural capital (specifically forested headwaters and low land wetlands) rather than built capital (specifically stopbanks) for flood protection in the Manawatū watershed, New Zealand. Significant investment is currently required to maintain and enhance river engineering infrastructure and keep pace with changes in the river's geomorphology. Viewed from a systems perspective, we suggest diversion of a proportion of existing funding into restoration of forested headwaters on steep slopes and restoration of functioning wetlands on floodplains could in the longer term provide an effective approach to flood protection. Co‐benefits of increased natural capital include the ecosystem services nutrient cycling, sediment capture, water purification, biodiversity, pollination, and cultural and recreational values. Overcoming an investment trap requires a longer term perspective. This simple model consisting of two feedback loops and two delays aims to contribute to an ongoing stakeholder dialogue concerning the Manawatū River watershed in New Zealand. 相似文献
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Trond Husby Henri L. F. de Groot Marjan W. Hofkes Tatiana Filatova 《Mitigation and Adaptation Strategies for Global Change》2018,23(2):147-168
Human migration is increasingly seen as a promising climate change adaptation and flood risk reduction strategy. The purpose of this paper is to investigate how spatial differences in flood risk, due to differences in flood protection, reduce the mobility of vulnerable households through a credit constraint mechanism. Using an equilibrium model with two households types and endogenous sorting, we show how spatial differences in flood protection lead to clustering of vulnerable households in a risky region, in a real-world setting of common United States (US) flood zones. We find clustering effects of some size for flood zones with return periods of less than 30 years. 相似文献
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Francis Strobbe Mark A. McPeek Marjan De Block Robby Stoks 《Behavioral ecology and sociobiology》2011,65(2):241-247
Despite the importance of foraging activity for the growth/predation risk trade-off, studies that demonstrated predator-induced
survival selection on foraging activity under semi-natural conditions are relatively rare. Here, we tested for fish-induced
selection for reduced foraging activity in two larval Enallagma damselflies using a field enclosure experiment. Fish imposed considerable mortality in both damselfly species and survival
selection on foraging activity could be detected in Enallagma geminatum. We did not detect selection in Enallagma hageni, probably because this species already was not eating very much in the absence of fish compared to E. geminatum. Both species responded strongly to the presence of predators by reducing their foraging activity. The documented survival
selection on foraging activity was detected despite the already low activity levels in fish lake prey species and despite
strong predator-induced plasticity in this trait. 相似文献
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Sonocatalytic degradation of tetracycline antibiotic in aqueous solution by sonocatalysis 总被引:1,自引:0,他引:1
Mohammad Hoseini Gholam Hossein Safari Hossein Kamani Jalil Jaafari Marjan Ghanbarain 《毒物与环境化学》2013,95(10):1680-1689
Tetracycline (TC), one of the most common antibiotics, is often poorly bio-degraded in conventional wastewater treatment plants. In this study, the sonocatalytic degradation of TC was investigated using TiO2 nano-particles as catalyst. The effect of pH, initial TC concentrations, reaction times, and H2O2 concentrations were evaluated. The efficacy of ultrasonic irradiation alone in the removal of this pollutant was negligible but removal efficiency increased upon addition of TiO2 up to 250 mg L?1; increase of pH and initial TC concentration attenuated TC degradation. Addition of H2O2 raised the removal efficiency so that complete removal of TC was achieved within 75 min. 相似文献