Abteilung Oberflächengewässer

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   0 => Snowflake\Publications\Domain\Model\Publicationprototypepersistent entity (uid=22019, pid=124)
      originalId => protected22019 (integer)
      authors => protected'Aksamit, C. K.; Carolli, M.; Vanzo, D.; Weber, C.; 
         Schmid, M.' (91 chars)
      title => protected'Macroinvertebrate recovery to varying hydropeaking frequency: a small hydrop
         ower plant experiment' (97 chars)
      journal => protected'Frontiers in Environmental Science' (34 chars)
      year => protected2021 (integer)
      volume => protected8 (integer)
      issue => protected'' (0 chars)
      startpage => protected'602374 (16 pp.)' (15 chars)
      otherpage => protected'' (0 chars)
      categories => protected'field experiment; macroinvertebrate drift; flexible power production; physic
         al habitat; pool; riffle' (100 chars)
      description => protected'As the demand for hydroelectricity progresses worldwide, small hydropower op
         erators are increasingly examining the feasibility of using existing infrast
         ructure (e.g., settling basins) in run-of-the-river schemes for intermittent
          power production. Such flexible production causes short-term discharge fluc
         tuations (hydropeaking) in downstream reaches with potential adverse effects
          for the sensitive fauna and flora in alpine streams. In an experimental fie
         ld study on a previously unregulated section of the upper Rhone River (Switz
         erland), we measured density and composition of macroinvertebrate drift in t
         wo habitats (riffle, pool) following a 15-minute hydropeaking wave. The expe
         rimental hydropeaking was replicated five times over 14 days with decreasin
         g recovery times between peaks (8, 3, 2 days, and 24 h), and drift measure
         ments were compared with kick samples for the benthic community. Results fro
         m the kick sampling showed that benthic macroinvertebrate abundance and comp
         osition did not significantly change between the experimental peaks. There w
         ere habitat specific reactions in macroinvertebrate drift to hydropeaking, w
         ith the pool experiencing more pronounced drift abundances than the riffle. 
         Overall, drift abundance was not significantly correlated with recovery time
         , but results indicate taxa-specific differences. This research advocates fo
         r the importance of completing more <em>in-situ</em> field experiments in or
         der to better understand the ecological impact of flexible power production 
         in small hydropower plants.' (1547 chars)
      serialnumber => protected'' (0 chars)
      doi => protected'10.3389/fenvs.2020.602374' (25 chars)
      uid => protected22019 (integer)
      _localizedUid => protected22019 (integer)modified
      _languageUid => protectedNULL
      _versionedUid => protected22019 (integer)modified
      pid => protected124 (integer)
   1 => Snowflake\Publications\Domain\Model\Publicationprototypepersistent entity (uid=22548, pid=124)
      originalId => protected22548 (integer)
      authors => protected'Calamita,&nbsp;E.; Vanzo,&nbsp;D.; Wehrli,&nbsp;B.; Schmid,&nbsp;M.' (67 chars)
      title => protected'Lake modeling reveals management opportunities for improving water quality d
         ownstream of transboundary tropical dams' (116 chars)
      journal => protected'Water Resources Research' (24 chars)
      year => protected2021 (integer)
      volume => protected57 (integer)
      issue => protected'4' (1 chars)
      startpage => protected'e2020WR027465 (20 pp.)' (22 chars)
      otherpage => protected'' (0 chars)
      categories => protected'' (0 chars)
      description => protected'Water quality in tropical rivers is changing rapidly. The ongoing boom of da
         m construction for hydropower is one of the drivers for this change. In part
         icular, the stratification in tropical reservoirs induces oxygen deficits in
          their deep waters and warmer surface water temperatures, which often transl
         ate into altered thermal and oxygen regimes of downstream river systems, wit
         h cascading consequences for the entire aquatic ecosystem. Operation rules o
         f reservoirs, involving water intakes at different levels, could mitigate th
         e consequences for downstream water quality. However, optimized water manage
         ment of deep reservoirs relies on predictive models for water quality, but s
         uch predictive capability is often lacking for tropical dams. Here we focus 
         on the Zambezi River Basin (southern Africa) to address this gap. Using the 
         one-dimensional General Lake Model, we reproduced the internal dynamics of t
         he transboundary Lake Kariba, the world’s largest artificial lake by volum
         e, created by damming the Zambezi River at the border between Zambia and Zim
         babwe. Through this modeling approach, we assessed and quantified the therma
         l and oxygen alteration in the Zambezi River downstream of the reservoir. Re
         sults suggest that these alterations depend directly on Kariba’s stratific
         ation dynamics, its water level and the transboundary policies for water wit
         hdrawal from the reservoir. Scenario calculations indicate a large potential
          for mitigating downstream water quality alterations by implementing a hypot
         hetical selective withdrawal technology. However, we show that a different a
         nd cooperative management of the existing infrastructure of Kariba Dam has t
         he potential to mitigate most of the actual water quality alterations.' (1742 chars)
      serialnumber => protected'0043-1397' (9 chars)
      doi => protected'10.1029/2020WR027465' (20 chars)
      uid => protected22548 (integer)
      _localizedUid => protected22548 (integer)modified
      _languageUid => protectedNULL
      _versionedUid => protected22548 (integer)modified
      pid => protected124 (integer)
   2 => Snowflake\Publications\Domain\Model\Publicationprototypepersistent entity (uid=17061, pid=124)
      originalId => protected17061 (integer)
      authors => protected'Kobler,&nbsp;U.&nbsp;G.; Wüest,&nbsp;A.; Schmid,&nbsp;M.' (57 chars)
      title => protected'Effects of lake – reservoir pumped-storage operations on temperature and w
         ater quality' (88 chars)
      journal => protected'Sustainability' (14 chars)
      year => protected2018 (integer)
      volume => protected10 (integer)
      issue => protected'6' (1 chars)
      startpage => protected'1968 (15 pp.)' (13 chars)
      otherpage => protected'' (0 chars)
      categories => protected'hydropower; stratification; reservoir modeling; recommissioning' (63 chars)
      description => protected'Pumped-storage (PS) hydropower plants are expected to make an important cont
         ribution to energy storage in the next decades with growing market shares of
          new renewable electricity. PS operations affect the water quality of the co
         nnected water bodies by exchanging water between them but also by deep water
          withdrawal from the upper water body. Here, we assess the importance of the
         se two processes in the context of recommissioning a PS hydropower plant by 
         simulating different scenarios with the numerical hydrodynamic and water qua
         lity model CE-QUAL-W2. For extended PS operations, the results show signific
         ant impacts of the water exchange between the two water bodies on the season
         al dynamics of temperatures, stratification, nutrients, and ice cover, espec
         ially in the smaller upper reservoir. Deep water withdrawal was shown to str
         ongly decrease the strength of summer stratification in the upper reservoir,
          shortening its duration by ~1.5 months, consequently improving oxygen avail
         ability, and reducing the accumulation of nutrients in the hypolimnion. Thes
         e findings highlight the importance of assessing the effects of different op
         tions for water withdrawal depths in the design of PS hydropower plants, as 
         well as the relevance of defining a reference state when a PS facility is to
          be recommissioned.' (1311 chars)
      serialnumber => protected'' (0 chars)
      doi => protected'10.3390/su10061968' (18 chars)
      uid => protected17061 (integer)
      _localizedUid => protected17061 (integer)modified
      _languageUid => protectedNULL
      _versionedUid => protected17061 (integer)modified
      pid => protected124 (integer)
   3 => Snowflake\Publications\Domain\Model\Publicationprototypepersistent entity (uid=17067, pid=124)
      originalId => protected17067 (integer)
      authors => protected'Lange,&nbsp;K.; Meier,&nbsp;P.; Trautwein,&nbsp;C.; Schmid,&nbsp;M.; Robinso
         n,&nbsp;C.&nbsp;T.; Weber,&nbsp;C.; Brodersen,&nbsp;J.' (130 chars)
      title => protected'Basin-scale effects of small hydropower on biodiversity dynamics' (64 chars)
      journal => protected'Frontiers in Ecology and the Environment' (40 chars)
      year => protected2018 (integer)
      volume => protected16 (integer)
      issue => protected'7' (1 chars)
      startpage => protected'397' (3 chars)
      otherpage => protected'404' (3 chars)
      categories => protected'' (0 chars)
      description => protected'Construction of small hydropower plants (<10 megawatts) is booming worldwide
         , exacerbating ongoing habitat fragmentation and degradation, and further fu
         eling biodiversity loss. A systematic approach for selecting hydropower site
         s within river networks may help to minimize the detrimental effects of smal
         l hydropower on biodiversity. In addition, a better understanding of reach-a
         nd basin-scale impacts is key for designing planning tools. We synthesize th
         e available information about (1) reach-scale and (2) basin-scale impacts of
          small hydropower plants on biodiversity and ecosystem function, and (3) int
         eractions with other anthropogenic stressors. We then discuss state-of-the-a
         rt, spatially explicit planning tools and suggest how improved knowledge of 
         the ecological and evolutionary impacts of hydropower can be incorporated in
         to project development. Such tools can be used to balance the benefits of hy
         dropower production with the maintenance of ecosystem services and biodivers
         ity conservation. Adequate planning tools that consider basin-scale effects 
         and interactions with other stressors, such as climate change, can maximize 
         long-term conservation.' (1163 chars)
      serialnumber => protected'1540-9295' (9 chars)
      doi => protected'10.1002/fee.1823' (16 chars)
      uid => protected17067 (integer)
      _localizedUid => protected17067 (integer)modified
      _languageUid => protectedNULL
      _versionedUid => protected17067 (integer)modified
      pid => protected124 (integer)