scholarly journals Instream ecological flow and reservoir ecological operation in the upper reaches of Irtysh River

2018 ◽  
Vol 246 ◽  
pp. 01103
Author(s):  
Jian Li ◽  
Ziqiang Xia ◽  
Wei Yin ◽  
Haiyan Jia
Keyword(s):  
Lower Limit ◽  
River Systems ◽  
Aquatic Life ◽  
Ecological Flow ◽  
Suitable Target ◽  
Reservoir Construction ◽  
Irtysh River ◽  
Dry Seasons ◽  
Ecological Flows ◽  
The Irtysh River

Instream ecological flow (IEF) and flow-related variations were important for healthy river systems. However, water conservancy projects such as reservoirs altered the processes of IEF and thereby posed considerable threat to the health of river systems and aquatic lives. To that end, in this study the effects of reservoir construction on IEF in the upper reaches of the Irtysh River were analyzed using an improved hydrological method. The computed results were in turn used to determine the maximum (MaxIEF), minimum (MinIEF) and optimal (OptIEF) instream ecological flows of the river. Based on the study, reservoir impoundments limited IEF in wet seasons but enhanced it in dry seasons. It also narrowed suitable flow range for reproduction and growth of aquatic life. Reservoirs could be used to regulate Irtysh River discharge. For healthy instream processes in wet years, OptIEF could be set as the lower limit and MaxIEF as the upper limit. For much the same reasons, MinIEF could be set as the lower limit in dry years and OptIEF as a suitable target in normal years.

scholarly journals Determinación de caudales ecológicos en el río Cutuchi, Ecuador

2020 ◽  
Vol 5 (2) ◽  
pp. 33
Author(s):  
Mercy Llbay Yupa ◽  
Paola Albarrasín ◽  
Víctor M García
Keyword(s):  
Reference Method ◽  
Aquatic Life ◽  
Flow Rates ◽  
Minimum Flow ◽  
Tukey Test ◽  
Seasonal Flow ◽  
Ecological Flow ◽  
Del Rio ◽  
Hydrological Station ◽  
Ecological Flows

  La legislación del Ecuador obliga a mantener un caudal ecológico para preservar los ecosistemas y la biodiversidad. Sin embargo, son pocos los ríos en el país en los que se ha establecido el flujo mínimo. El objetivo de esta investigación fue determinar el caudal ecológico en el río Cutuchi, estación hidrológica Cutuchi A.J. Yanayacu (H792), mediante los métodos: Caudal de permanencia, Suizo, Tennant, Rafael Heras y Referencial. Adicionalmente, se comparó con el caudal ecológico al 10% del caudal medio mensual multianual establecido en la transitoria sexta de la ley ecuatoriana. También se analizó las tendencias del caudal y la precipitación en la cuenca alta del río Patate. Los resultados evidencian un caudal promedio anual de 9,64 m3/s para el río Cutuchi, con dos regímenes hidrológicos (avenidas y estiaje) que respondes a la distribución de las precipitaciones. La comparación de medias según la prueba de Tukey al 5%, determinó a los métodos Referenciales seguidos de Tennant, como adecuados para la sobrevivencia de la vida acuática en el río. De igual manera, los caudales estimados fueron superiores al caudal mínimo observado para el periodo 1990-2014. El análisis de tendencia mediante la prueba estadística de Mann-Kendall evidenció que el caudal anual y estacional presentaron cambios o tendencias significativas (p<0,01). Sin embargo, la precipitación no mostró cambios de aumento o disminución durante los 20 años (p<0,05=.   Palabras claves: Río Cutuchi, Caudales ecológicos, método Referencial, Tennant.   Abstract =Ecuador's legislation requires maintaining an ecological flow to preserve ecosystems and biodiversity. However, few rivers in the country where the minimum flow has been established. The objective of this research was to determine the ecological flow in the Cutuchi River, Cutuchi A.J. Yanayacu hydrological station (H792), using the methods: Permanence Flow, Swiss, Tennant, Rafael Heras and Referential. In addition, it was compared with the ecological flow to 10% of the average monthly multi-year flow established in the transitional sixth of Ecuadorian law. Flow and precipitation trends in the upper Patate River basin were also analyzed. The results show an average annual flow of 9.64 m3/s for the Cutuchi River, with two hydrological regimes (avenues and styling) that respond to the distribution of precipitation. The comparison of means according to the Tukey test at 5%, determined the Referential methods followed by Tennant, as suitable for the survival of aquatic life in the river. Similarly, the estimated flow rates were higher than the minimum flow observed for the period 1990-2014. Trend analysis using Mann-Kendall's statistical test showed that annual and seasonal flow showed significant changes or trends (p<0.01). However, precipitation showed no changes in increase or decrease during the 20 years (p<0.05=.   Keywords: Cutuchi River, Ecological flows, Reference method, Tennant.  

scholarly journals Calculation and Analysis of the Instream Ecological Flow for the Irtysh River

2012 ◽  
Vol 28 ◽  
pp. 438-441 ◽  
Author(s):  
Fucheng Yang ◽  
Ziqiang Xia ◽  
Lanlan Yu ◽  
Lidan Guo
Keyword(s):  
Ecological Flow ◽  
Irtysh River ◽  
The Irtysh River

A stonefly species extinct in Europe (Taeniopteryx araneoides Klapalek, 1902, Taeniopterygidae, Plecoptera) is thriving in the Irtysh River in West Siberia and North Kazakhstan

Zootaxa ◽  
2017 ◽  
Vol 4247 (2) ◽  
pp. 141 ◽  
Author(s):  
OLEG E. KOSTERIN ◽  
NAZYMGUL AKIMBEKOVA ◽  
VLADIMIR V. DUBATOLOV ◽  
IGNAC SIVEC
Keyword(s):  
Anthropogenic Impacts ◽  
West Siberia ◽  
Large Rivers ◽  
Geographical Range ◽  
Central Siberia ◽  
Irtysh River ◽  
The Irtysh River

Taeniopteryx araneoides Klápalek, 1902, a stonefly species with brachypterous males, known historically from the Danube, Elbe, and Dniester rivers, but considered to be extinct at least in Europe for more than a century. This species has also been doubtfully reported from Krasnoyarsk, Central Siberia. However, we report this species to be still thriving in the Irtysh River at the cities of Omsk (West Siberia, Russia) and Pavlodar (North Kazakhstan). The occurrence of this species reported least fifty years ago from the Yenisey River at Krasnoyarsk, Russia is considered possible. Unlike the widespread Palaearctic T. nebulosa (Linnaeus, 1758) that occurs in a broad range of stream types, T. araneoides is a potomon species, apparently confined to large rivers. In this habitat, it appears vulnerable to anthropogenic impacts and may be unable to compete with T. nebulosa. The construction of dams and reservoirs has apparently extirpated T. araneoides from most of its former geographical range. 

scholarly journals Attempt to Define the Complexes of Bat Ectoparasites in the Boreal Palaearctic Region / Попытка выделения комплексов эктопаразитов летучих мышей бореальной Палеарктики

2015 ◽  
Vol 49 (1) ◽  
pp. 75-86 ◽  
Author(s):  
M. V. Orlova ◽  
O. L. Orlov
Keyword(s):  
Far East ◽  
Palaearctic Region ◽  
Taiga Zone ◽  
The West ◽  
Bat Flies ◽  
The Family ◽  
Gamasid Mites ◽  
Faunal Complexes ◽  
Irtysh River ◽  
The Irtysh River

Abstract The article presents the most complete data on the distribution of ectoparasites in the boreal Palaearctics (gamasid mites of the genera Spinturnix, Macronyssus, and Steatonyssus, bat flies of the family Nycteribiidae, fleas of the family Ischnopsyllidae) and its preferences for the hosts. On the basis of these data as well as the data for the resettlement of bats in Eurasia 30 species of boreal bat ectoparasites combined into three faunal complexes (Transpalaearctic, European-Ural and Siberian-Far East) and two groups (European-Ural species, penetrating to the east and Siberian-Far East, penetrating to the west). The boundary between the European-Ural and Siberian-Far East faunal complexes is situated presumably along the Irtysh River. The resulting zoning provides a new look at the parasitocenosis of ectoparasites in the taiga zone of the Palaearctics.

scholarly journals CHARACTERISTIC OF HARD TO IDENTIFY GENUS ACIPENSER SPECIES IN THE IRTYSH RIVER

2018 ◽  
pp. 90-98 ◽  
Author(s):  
Andrey Stepanovich Aldokhin ◽  
Gleb Igorevich Volosnikov
Keyword(s):  
Water Area ◽  
Bone Plates ◽  
Similar Species ◽  
Summer Period ◽  
Sturgeon Species ◽  
Irtysh River ◽  
June July ◽  
The Irtysh River

In the summer period (June-July) of 2018 on the Irtysh river (the Tobolsk region) in the control catches of sterlet there were found specimens with pronounced differences from individuals inhabiting this water area. Differences were found in the form of bone plates and linear-weight characteristics. Later, local fishermen reported on many cases of specimens having the above differences. Reports about the similar species came from the Uvat region. In order to establish the belonging of these individuals to a particular family there have been investigated meristic features which are considered diagnostic for sturgeon species, as well as for hybrids. In the result of the study there was made a conclusion about belonging of these specimens to the genus Acipenser and, most likely, to the sterlet species.

scholarly journals Modeling Snow Depth and Snow Water Equivalent Distribution and Variation Characteristics in the Irtysh River Basin, China

2021 ◽  
Vol 11 (18) ◽  
pp. 8365
Author(s):  
Liming Gao ◽  
Lele Zhang ◽  
Yongping Shen ◽  
Yaonan Zhang ◽  
Minghao Ai ◽  
...  
Keyword(s):  
Snow Cover ◽  
River Basin ◽  
Snow Depth ◽  
Snow Water Equivalent ◽  
Snow Accumulation ◽  
Implicit Scheme ◽  
Snow Water ◽  
Irtysh River ◽  
Simulation Results ◽  
The Irtysh River

Accurate simulation of snow cover process is of great significance to the study of climate change and the water cycle. In our study, the China Meteorological Forcing Dataset (CMFD) and ERA-Interim were used as driving data to simulate the dynamic changes in snow depth and snow water equivalent (SWE) in the Irtysh River Basin from 2000 to 2018 using the Noah-MP land surface model, and the simulation results were compared with the gridded dataset of snow depth at Chinese meteorological stations (GDSD), the long-term series of daily snow depth dataset in China (LSD), and China’s daily snow depth and snow water equivalent products (CSS). Before the simulation, we compared the combinations of four parameterizations schemes of Noah-MP model at the Kuwei site. The results show that the rainfall and snowfall (SNF) scheme mainly affects the snow accumulation process, while the surface layer drag coefficient (SFC), snow/soil temperature time (STC), and snow surface albedo (ALB) schemes mainly affect the melting process. The effect of STC on the simulation results was much higher than the other three schemes; when STC uses a fully implicit scheme, the error of simulated snow depth and snow water equivalent is much greater than that of a semi-implicit scheme. At the basin scale, the accuracy of snow depth modeled by using CMFD and ERA-Interim is higher than LSD and CSS snow depth based on microwave remote sensing. In years with high snow cover, LSD and CSS snow depth data are seriously underestimated. According to the results of model simulation, it is concluded that the snow depth and snow water equivalent in the north of the basin are higher than those in the south. The average snow depth, snow water equivalent, snow days, and the start time of snow accumulation (STSA) in the basin did not change significantly during the study period, but the end time of snow melting was significantly advanced.

scholarly journals Chemical and environmental assessment of the bottom sediments in the Irtysh River (Tyumen Region, Russian Federation)

Vestnik MGTU ◽  
2019 ◽  
Vol 22 (1) ◽  
pp. 177-187
Author(s):  
E. S. Zemtsova ◽  
◽  
G. S. Alimova ◽  
A. Yu. Tokareva ◽  
◽  
...  
Keyword(s):  
Russian Federation ◽  
Bottom Sediments ◽  
Environmental Assessment ◽  
Irtysh River ◽  
The Irtysh River

scholarly journals Morphology of an Early Oligocene beaver Propalaeocastor irtyshensis and the status of the genus Propalaeocastor

PeerJ ◽  
2017 ◽  
Vol 5 ◽  
pp. e3311 ◽  
Author(s):  
Lüzhou Li ◽  
Qiang Li ◽  
Xiaoyu Lu ◽  
Xijun Ni
Keyword(s):  
Global Climate Change ◽  
Global Climate ◽  
Dental Morphology ◽  
Late Oligocene ◽  
Morphological Comparison ◽  
Valid Genus ◽  
Early Oligocene ◽  
The Status ◽  
Irtysh River ◽  
The Irtysh River

The Early to Late Oligocene Propalaeocastor is the earliest known beaver genus from Eurasia. Although many species of this genus have been described, these species are defined based on very fragmentary specimens. Propalaeocastor irtyshensis from the Early Oligocene Irtysh River Formation in northwestern Xinjiang, China is one of the earliest-known members of Propalaeocastor. This species is defined on a single maxillary fragment. We revise the diagnosis of P. irtyshensis and the genus Propalaeocastor, based on newly discovered specimens from the Irtysh River Formation. The dental morphology of P. irtyshensis is very similar to other early castorids. The caudal palatine foramen of P. irtyshensis is situated in the maxillary-palatine suture. This is a feature generally accept as diagnostic character for the castorids. On the other hand, P. irtyshensis has two upper premolars, a rudimentarily developed sciuromorph-like zygomatic plate, and a relatively large protrogomorph-like infraorbital foramen. Some previous researchers suggested that Propalaeocastor is a junior synonym of Steneofiber, while other took it as a valid genus. Our morphological comparison and phylogenetic analysis suggest that Propalaeocastor differs from Steneofiber and is a valid genus. We also suggest that Agnotocastor aubekerovi, A. coloradensis, A. galushai, A. readingi, Oligotheriomys primus, and “Steneofiber aff. dehmi” should be referred to Propalaeocastor. Propalaeocastor is the earliest and most basal beaver. The origin place of Propalaeocastor and castorids is uncertain. The Early Oligocene radiation of castorids probably is propelled by the global climate change during the Eocene-Oligocene transition.

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