scholarly journals ASSESSMENT OF WATER AND SEDIMENT CHARACTERISTICS OF THE NORTHERN DANUBE DELTA LAKES - MATIȚA, BABINA AND MERHEI, ROMANIA

2017 ◽  
Author(s):  
Irina Catianis ◽  
◽  
Dan Secrieru ◽  
Albert Scrieciu ◽  
Dumitru Grosu ◽  
...  
Keyword(s):  
Danube Delta ◽  
Sediment Characteristics ◽  
Water And Sediment

scholarly journals Impact of humic substances on Sphagnum denticulatum habitats

2014 ◽  
Vol 71 (1) ◽  
pp. 63-69 ◽  
Author(s):  
Krzysztof Banaś
Keyword(s):  
Humic Substances ◽  
Calcium Concentration ◽  
Habitat Characteristics ◽  
Low Density ◽  
Sediment Characteristics ◽  
Acid Lakes ◽  
Water And Sediment ◽  
Frequent Species ◽  
Softwater Lakes ◽  
Nw Poland

In 10 softwater lakes of NW Poland (5 very acid and 5 slightly acid) three kinds of <em>Sphagnum denticulatum</em> Bridel [=<em>S. auriculatum</em> Schimper] habitats have been studied: oligohumic (&lt;2.0 mg C<sub>DHS</sub> dm<sup>-3</sup>) and α-mesohumic (2.0-4.0 mg C<sub>DHS</sub> dm<sup>-3</sup>) and β-mesohumic (4.1-8.0 mg C<sub>DHS</sub> dm<sup>-3</sup>). During habitats humification in very acid lakes some water and sediment characteristics, such as pH, conductivity, TDS, and calcium concentration are low and almost invariable, whereas variable are the colour and clearness of the water. In low-acidity lakes the values of habitat characteristics are higher and also nearly invariable. The optimum habitats for <em>S. denticulatum</em> are oligohumic (&lt;1.8 mg C<sub>DHS</sub> dm <sup>-3</sup>), very acid (pH 4.0-4.4) sites found at depths from 4 to 8 m, where the species forms large and close carpets. In slightly acid lakes it is rare, grows at depths below 5 m and forms populations of very low density. In mesohumic habitats in both kinds of lakes <em>S. denticulatum</em> is a frequent species, but its populations are very thin there.

180 Relationships Between Water and Sediment Characteristics and Benthic Green Macroalgal Abundance in Yaquina Bay, Oregon: 1999-2002

2003 ◽  
Vol 39 (s1) ◽  
pp. 62-62
Author(s):  
D. R. Young ◽  
R. J. Ozretich ◽  
D. T. Specht ◽  
J. O. Lamberson ◽  
R. S. Caldwell ◽  
...  
Keyword(s):  
Sediment Characteristics ◽  
Water And Sediment

scholarly journals Probability Analysis and Control of River Runoff–sediment Characteristics based on Pair-Copula Functions: The Case of the Weihe River and Jinghe River

Water ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 510 ◽  
Author(s):  
Qiying You ◽  
Hao Jiang ◽  
Yan Liu ◽  
Zhao Liu ◽  
Zilong Guan
Keyword(s):  
River Runoff ◽  
Copula Function ◽  
Distribution Functions ◽  
Sediment Characteristics ◽  
Copula Functions ◽  
Sediment Yields ◽  
Water And Sediment ◽  
Weihe River ◽  
Runoff Sediment ◽  
Sediment Resources

Analyzing the encounter frequency of high–low runoff and sediment yield is important for the appropriate dispatching of runoff–sediment resources, as well as river regulation. However, there have been no reports on the utilization of the pair-copula function in analyzing the runoff–sediment characteristics from a probabilistic perspective and conducting probability control on the runoff–sediment yields of different hydrologic stations. This paper builds marginal distribution functions on the basis of kernel distribution theory. In addition, this paper builds the joint distribution functions through pair-copula functions in order to analyze the encounter probability and the compensation characteristics of high–low runoff and sediment at different stations on the Weihe River in China, as well as the origins of runoff–sediment, to conduct probability control of river runoff–sediment resource allocation. The results show that, in different periods, the synchronous probability of high–low runoff of the Weihe River’s Xianyang and Huaxian Stations, and the Jinghe River’s Zhangjiashan Station differ, while that of high–low sediment at the three stations changes little—remaining at around 54%. Therefore, the sediment and runoff of the Weihe River apparently have different origins. In years of high and low runoff, if the runoffs of the Xianyang and Zhangjiashan Stations can be kept within a certain range, then the runoff of the Huaxian Station will be in a particular range, at a certain probability. Sediment at the Huaxian Station can be controlled, in a similar way. These results are of great significance for the water and sediment management department of the Weihe river, in order to reasonably allocate water and sediment resources.

scholarly journals An Analysis of Driving Factors on Water and Sediment Evolution

2020 ◽  
Vol 145 ◽  
pp. 02013
Author(s):  
Wei Zhao ◽  
Yufei Mao ◽  
Yuanyuan Fang
Keyword(s):  
River Basins ◽  
Driving Factors ◽  
Underlying Surface ◽  
Sediment Discharge ◽  
Sediment Characteristics ◽  
Surface Change ◽  
Relational Analysis ◽  
Water And Sediment ◽  
Correlation Degree ◽  
Grey Relational

The underlying surface has an influence on the characteristics of runoff and sediment characteristics in river basins. And the features of the different scales underlying surfaces have various effects on the runoff and sediment discharge in Kuye River. By analysing the concerned data from 1980 to 2013, this paper took 3 different scales watersheds in Kuye River Basin as the objects to study the influence of the underlying surface change on the runoff and sediment evolution in different scales and calculate the correlation degree of the driving factors by using grey relational analysis.

scholarly journals Aquatic invertebrate's distribution in a freshwater coastal lagoon of southern Brazil in relation to water and sediment characteristics

2011 ◽  
Vol 23 (2) ◽  
pp. 119-127 ◽  
Author(s):  
Leonardo Kleba Lisboa ◽  
Aurea Luiza Lemes da Silva ◽  
Mauricio Mello Petrucio
Keyword(s):  
Coastal Lagoon ◽  
Benthic Community ◽  
Coastal Lagoons ◽  
Linear Regression Analysis ◽  
Benthic Invertebrate ◽  
Sediment Characteristics ◽  
Invertebrate Community ◽  
Local Conditions ◽  
Water And Sediment ◽  
Local Depth

AIM: The objective of this study was to evaluate the influence of water and sediment characteristics on the abundance, richness and diversity of the benthic invertebrate community in Peri lagoon, a freshwater coastal lagoon located in central coast of Santa Catarina State; METHODS: Samplings were performed in April, May and June 2009, in five different sites of Peri lagoon. The samples were taken with an Eckman-Birge drag, totalizing 60 for the invertebrate community, and 45 for sediment. Water physicochemical variables were also measured. Environmental influences in benthic community have been measured using a Canonical Correspondence Analysis (CCA). Linear regressions were also plotted for main correlations; RESULTS: A total of 5,535 specimens were collected, identified into 18 taxa. Tanaidacea was the most abundant representing 54% of relative abundance, followed by Diptera (23%), and Ostracoda (17%). The richest family was Chironomidae with 6 taxa. CCA results indicated positive correlation between Chaoborus and Stenocypris with local depth, and negative correlation between Odonata, Gastropoda, Cytheridella and Coleoptera with the finest grains of sediment, as well as between Tanaidacea, Lopescladius, Annelida and Nematoda with both organic matter (OM) content in sediment and local depth. Linear regression analysis demonstrated inverse relation of Tanaidacea in response to OM (y = 0.6 - 0.62.OM) and sand (y = 0.6 - 0.6.sand), and of Lopescladius in response to OM (y = 0.37 - 0.41.OM) and sand (y = 0.37 - 0.46.sand). The fact that Peri lagoon has no marine influence and has Tanaidacea as the most abundant taxa, a group not expected in freshwaters, gives to this lagoon a particular relevance among coastal lagoons. The study concluded that sediment characteristics and local depth are more significant than water variables in determining the benthic community structure in Peri lagoon, which varied in accordance with different local conditions.

Performance of Sumur Gendong (SeDrainPond) Technology on Harvesting Water and Sediment with Respect to Effective Rainy Days

2019 ◽  
Vol 10 (1) ◽  
pp. 41 ◽  
Author(s):  
Ignatius Sriyana ◽  
Imam Wahyudi ◽  
Rick Heikoop ◽  
Kusmiyati Florentina ◽  
Haryono Putro
Keyword(s):  
Water And Sediment ◽  
Rainy Days
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