東華大學圖書館 |

Numerical Investigation of River Discharge and Tidal Variations Impact on the Salinity in Deltaic Systems.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Numerical Investigation of River Discharge and Tidal Variations Impact on the Salinity in Deltaic Systems./
作者:	Matsoukis, Konstantinos.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2022,
面頁冊數:	175 p.
附註:	Source: Dissertations Abstracts International, Volume: 84-01, Section: B.
Contained By:	Dissertations Abstracts International84-01B.
標題:	Aquaculture. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29191714
ISBN:	9798835543106

Numerical Investigation of River Discharge and Tidal Variations Impact on the Salinity in Deltaic Systems.
Matsoukis, Konstantinos.

Numerical Investigation of River Discharge and Tidal Variations Impact on the Salinity in Deltaic Systems. - Ann Arbor : ProQuest Dissertations & Theses, 2022 - 175 p.

Source: Dissertations Abstracts International, Volume: 84-01, Section: B.

Thesis (Ph.D.)--The University of Liverpool (United Kingdom), 2022.

This item must not be sold to any third party vendors.

The present project is an effort to identify key parameters and controlling factors of salinity variations in deltaic systems. The salinity's driving mechanisms and response to hydrodynamic changes are under investigation. This is demanded because of the risks that these ecosystems are subject to by increases of salinity due to sea level rise and human activities. Numerical modelling is implemented to study the salinity distribution in idealized deltas configuration under various hydrodynamic conditions. In particular, variations of the river discharge and tidal levels are considered. The results indicate that salinity undergoes significant seasonal changes due to dynamic flow variability. Sustained drought periods could result in critical conditions with salt intrusion in the delta's trunk (fluvial) channel. On the contrary, high river discharges during wet periods could mix completely the vertical column with freshwater for at least some distance from the river mouth. Tides could contribute further in mixing improving the conditions in the delta by decreasing the salinity in the downstream delta areas. Hence, many tidally influenced deltas could contain higher freshwater volumes than river dominated systems. Nevertheless, tidal level increases could limit significantly the deltas freshwater availability in mesotidal or macrotidal regimes. Results analysis and implementation of simple and innovative techniques uncovered the existence of certain correlations that could be useful as prognostic tools of salinity. Channels classification by their class or number of links provides a correlation that shows the salinity to increase with the decrease of either the channels order or delta's cross-section width. In addition, radial and depth averages of salinity are negatively and exponentially correlated with the river discharge. The extracted exponential equation summarizes successfully the complex 3D delta dynamics into a 1D analytical solution. The equation resembles theoretical solutions of the 1D advection-diffusion equations under certain theoretical assumptions of which many are satisfied in the present idealized models setup. The above correlations incur modifications when external (e.g. hydrodynamic forcing) or intrinsic (e.g. bathymetry) parameters cause changes to the spatial salinity distribution. Bathymetric effects affect the salinity distribution in both horizontal and vertical directions especially at low flow periods when the bottom friction becomes stronger. Increases of the river discharge and/or tidal level override these effects. This study aspires to provide knowledge that could be useful for the development of technical or non-technical solutions for the aversion of salinization issues in deltas. With the goal of contributing to the efforts for the development of environmentally friendlier solutions, the last part of this work investigates the effect of different shape but equal volume hydrographs on the salinity. The results show that it is possible to alleviate the consequences of increased salinity by better management of existing water resources instead of seeking for additional ones.

ISBN: 9798835543106Subjects--Topical Terms:

545878
Aquaculture.

Numerical Investigation of River Discharge and Tidal Variations Impact on the Salinity in Deltaic Systems.
LDR:04561nmm a2200481 4500 001 2348290
005 20220908123022.5
008 241004s2022 ||||||||||||||||| ||eng d
020 $a 9798835543106
035 $a (MiAaPQ)AAI29191714
035 $a (MiAaPQ)Liverpool_3149970
035 $a AAI29191714
040 $a MiAaPQ $c MiAaPQ
100 1 $a Matsoukis, Konstantinos. $3 3687622
245 1 0 $a Numerical Investigation of River Discharge and Tidal Variations Impact on the Salinity in Deltaic Systems.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2022
300 $a 175 p.
500 $a Source: Dissertations Abstracts International, Volume: 84-01, Section: B.
500 $a Advisor: Leonardi, Nicoletta;Amoudry, Laurent;Bricheno, Lucy.
502 $a Thesis (Ph.D.)--The University of Liverpool (United Kingdom), 2022.
506 $a This item must not be sold to any third party vendors.
520 $a The present project is an effort to identify key parameters and controlling factors of salinity variations in deltaic systems. The salinity's driving mechanisms and response to hydrodynamic changes are under investigation. This is demanded because of the risks that these ecosystems are subject to by increases of salinity due to sea level rise and human activities. Numerical modelling is implemented to study the salinity distribution in idealized deltas configuration under various hydrodynamic conditions. In particular, variations of the river discharge and tidal levels are considered. The results indicate that salinity undergoes significant seasonal changes due to dynamic flow variability. Sustained drought periods could result in critical conditions with salt intrusion in the delta's trunk (fluvial) channel. On the contrary, high river discharges during wet periods could mix completely the vertical column with freshwater for at least some distance from the river mouth. Tides could contribute further in mixing improving the conditions in the delta by decreasing the salinity in the downstream delta areas. Hence, many tidally influenced deltas could contain higher freshwater volumes than river dominated systems. Nevertheless, tidal level increases could limit significantly the deltas freshwater availability in mesotidal or macrotidal regimes. Results analysis and implementation of simple and innovative techniques uncovered the existence of certain correlations that could be useful as prognostic tools of salinity. Channels classification by their class or number of links provides a correlation that shows the salinity to increase with the decrease of either the channels order or delta's cross-section width. In addition, radial and depth averages of salinity are negatively and exponentially correlated with the river discharge. The extracted exponential equation summarizes successfully the complex 3D delta dynamics into a 1D analytical solution. The equation resembles theoretical solutions of the 1D advection-diffusion equations under certain theoretical assumptions of which many are satisfied in the present idealized models setup. The above correlations incur modifications when external (e.g. hydrodynamic forcing) or intrinsic (e.g. bathymetry) parameters cause changes to the spatial salinity distribution. Bathymetric effects affect the salinity distribution in both horizontal and vertical directions especially at low flow periods when the bottom friction becomes stronger. Increases of the river discharge and/or tidal level override these effects. This study aspires to provide knowledge that could be useful for the development of technical or non-technical solutions for the aversion of salinization issues in deltas. With the goal of contributing to the efforts for the development of environmentally friendlier solutions, the last part of this work investigates the effect of different shape but equal volume hydrographs on the salinity. The results show that it is possible to alleviate the consequences of increased salinity by better management of existing water resources instead of seeking for additional ones.
590 $a School code: 0722.
650 4 $a Aquaculture. $3 545878
650 4 $a Topography. $3 3561794
650 4 $a Soil erosion. $3 602940
650 4 $a Basins. $3 3685275
650 4 $a Seasons. $3 523975
650 4 $a Drainage. $3 548581
650 4 $a Bathymetry. $3 3687623
650 4 $a Sediments. $3 3566210
650 4 $a Numerical analysis. $3 517751
650 4 $a Drinking water. $3 605014
650 4 $a Irrigation. $3 778786
650 4 $a Effluents. $3 3559973
650 4 $a Boundary conditions. $3 3560411
650 4 $a Ecosystems. $3 595401
650 4 $a Climate change. $2 bicssc $3 2079509
650 4 $a Agriculture. $3 518588
650 4 $a Construction. $3 3561054
650 4 $a Shoreline protection. $3 3687624
650 4 $a Soil fertility. $3 656383
650 4 $a River ecology. $3 3685237
650 4 $a Rice. $3 649844
650 4 $a Salinity. $3 594109
650 4 $a Rain. $3 3560372
650 4 $a Agronomy. $3 2122783
650 4 $a Applied mathematics. $3 2122814
650 4 $a Aquatic sciences. $3 3174300
650 4 $a Biological oceanography. $3 2122748
650 4 $a Biology. $3 522710
650 4 $a Civil engineering. $3 860360
650 4 $a Ecology. $3 516476
650 4 $a Engineering. $3 586835
650 4 $a Geomorphology. $3 542703
650 4 $a Mathematics. $3 515831
650 4 $a Physical geography. $3 516662
650 4 $a Physical oceanography. $3 3168433
650 4 $a Sedimentary geology. $3 3173828
650 4 $a Soil sciences. $3 2122699
690 $a 0473
690 $a 0404
690 $a 0285
690 $a 0364
690 $a 0792
690 $a 0416
690 $a 0306
690 $a 0543
690 $a 0329
690 $a 0537
690 $a 0484
690 $a 0405
690 $a 0368
690 $a 0415
690 $a 0594
690 $a 0481
710 2 $a The University of Liverpool (United Kingdom). $3 1684840
773 0 $t Dissertations Abstracts International $g 84-01B.
790 $a 0722
791 $a Ph.D.
792 $a 2022
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29191714