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Positive effects of reservoir sedimentation management on reservoir life: Examples from Japan
(2016)
The effectiveness of different strategies against reservoir sedimentation is demonstrated herein using data sets of Asahi, Nunobiki and Dashidaira reservoirs in Japan. The applied strategies encompass
sediment routing with a bypass tunnel, drawdown flushing during floods and sabo dam construction in the catchment. It is shown that bypassing and flushing are very efficient strategies enlarging reservoir life by 3 to 21 times up to many hundreds of years. Furthermore, it is revealed that also efforts in the catchment, e.g. sabo dam construction, is effective enlarging reservoir life by 2.4 times.
Sediment bypass tunnels are an effective and sustainable strategy against reservoir sedimentation. Sediments are diverted into the down-stream during floods without deposition in the reservoir, hence mor-phological and ecological variability increases. One major drawback of these tunnels is the severe invert abrasion due to a combination of high flow velocities and bedload sediment transport. The abrasion phenom-ena is briefly described, different abrasion prediction models are pre-sented and their applicability for the estimation of concrete abrasion is discussed.
Ausgehend von einer Online-Befragung im Jahr 2015 bietet die Studie einen umfassenden Überblick über den Entwicklungsstand von Prozessmanagement an deutschen Hochschulen: Wie ist eigentlich der Status Quo, welche technischen Voraussetzungen und organisatorischen Ansätze wurden gewählt, welche Empfehlungen ergeben sich aus den Erfahrungen fortgeschrittener Hochschulen für den Aufbau oder die Weiterentwicklung eines Prozessmanagement-Systems?
Further space exploration in the far-infrared (FIR) requires larger apertures in order to improve the spatial resolution of captured images. To this purpose, the Thinned Aperture Light Collector (TALC) concept of a deployable annular telescope has been recently developed at CEA, which offers novel perspectives for FIR space missions. The consortium ELICSIR consortium of European institutes and companies has been created to improve the technological readiness level (TRL) of its key systems and components.
Power: the missing element in sustainable consumption and absolute reductions research and action
(2016)
In this essay, we aim to demonstrate the value of a power lens on consumption and absolute reductions. Specifically, we illuminate what we perceive to be a troublesome pattern of neglect of questions of power in research and action on sustainable consumption and absolute reductions. In pursuit of our objectives, we delineate how many of the informal and implicit “theories of social change” of scholars and activists in sustainable consumption and sustainable development fail to address power in a sufficiently explicit, comprehensive and differentiated manner and how that failure translates into insufficient understandings of the drivers of consumption and the potential for and barriers to absolute reductions. Second, we develop the contours of a power lens on sustainable consumption. Third, we illustrate the value of such a power lens, with a particular focus on the case of meat consumption.
To understand the effects of sediment bypass on environmental recovery of the degraded channels below dams, bed topography and bed materials above and below dam reaches were surveyed by ground-based measurements and aerial photos using quadrocopter. Coarse bed materials such as boulders were more represented below than above the Koshibu dam, where the bypass tunnel had not been in operation yet. The coarse materials formed steps and protruded in the water column within riffles and runs, both of which can increase slow-flow areas, below the dam. On the other hand, sand, gravel, and cobbles were abundant below as much as above the Asahi dam, where the bypass tunnel had been operated for >17 years. The downstream environment in terms of bed topography and grain size seems to have almost been recovered for the Asahi dam. However, less representation of large cobbles and boulders below the dam suggested a possibility of a selective deposition of coarse materials at the upstream of the bypass tunnel inlet.
Sediment, which deposits and damages the function of reservoirs, is an essential element of aquatic habitats in downstream ecosystems. We reviewed ecosystem features of degraded channels associated with sediment deficiency below dams and ecosystem responses to changes in sediment conditions after management practices in Japan. Sediment bypass tunnel (SBT) is an effective way to transport sufficient amount of sediment to downstream ecosystems. Based on a concept of suitable mass and size of sediment for ecosystem, some effects and limitations of SBT on downstream ecosystems were discussed.
Mangelernährung ist bei Säuglingen und Kindern mit angeborenen Herzfehlern ein häufiges Phänomen. Das Ziel dieser Arbeit ist die Erstellung von Handlungsempfehlungen für die Prävention und Behandlung der Mangelernährung bei Säuglingen und Kindern mit angeborenen Herzfehlern über die Analyse der prä- und postoperativen Ernährungsstrategien, Identifikation von Barrieren und die Darstellung der Ernährungstherapie in der Praxis. Dazu wurden eine systematische Literaturrecherche und Experteninterviews mit Herzzentren aus Deutschland durchgeführt. Prä- und postoperativ wird zur Vermeidung einer Mangelernährung eine erhöhte Kalorienzufuhr verwendet. Es gibt vielfältige Barrieren, die eine ausreichende Nährstoffzufuhr erschweren wie z.B. Trinkschwäche. Eine Ernährungsunterstützung mit hochkalorischer Nahrung vor der Operation verbessert die postoperativen Outcomes und den Ernährungsstatus. Nach der Operation ist der Nahrungsaufbau früh zu beginnen. Eine enterale oder orale Ernährung ist der parenteralen Ernährung vorzuziehen. Zu dem perioperativen Ernährungsmanagement gehören die regelmäßige Erfassung des Ernährungsstatus, die Zusammenarbeit im multidisziplinären Team und ein standardisiertes Monitoring. Eine individuelle Ernährungsstrategie wird angewendet. Aus den Ergebnissen ist zu folgern, dass die grundlegende Maßnahme zur Prävention und Behandlung der Mangelernährung bei angeborenen Herzfehlern eine höhere Kalorienzufuhr ist. Damit die Energieaufnahme adäquat ist, müssen die Ursachen und Barrieren aufgedeckt und behandelt werden. Eine individuelle Betreuung ist für eine bedarfsdeckende Ernährung notwendig. Eine erhöhte präoperative Kalorienzufuhr und ein früher Nahrungsaufbau nach der Operation vermeidet die Entstehung hoher Nährstoffdefizite. Die Vorbereitung der Nachsorge und eine weitere Überwachung des Wachstums sind wichtig für die Erhaltung eines guten Ernährungsstatus der Kinder.
For long term use of dams, it is required to develop methods of sediment management in reservoirs.
As one method, Sediment BypassTunnels (SBT) are operated in Japan and Switzerland to prevent reservoir sedimentation. SBT reduces sedimentation in reservoirs by routing the incoming sediments around the dam. SBT, however, is prone to severe invert abrasion caused by high sediment flux. Therefore, it is necessary to establish a measurement system of sediment transport rates in the SBT. A geophone was experimentally investigated in a laboratory flume at ETH Zurich. The sediment transport rate is calculated based on the plate vibration caused by hitting of gravels. In this paper, in order to alleviate disadvantages of a geophone, two newly developed sensor systems, a plate microphone and plate vibration sensor, are suggested and the results of their calibration experiments are shown. Finally, they are compared with the existing methods.