scholarly journals Flow and Transport Numerical Model of a Coastal Aquifer Based on the Hydraulic Importance of a Dyke and Its Impact on Water Quality. Manglaralto—Ecuador

Water ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 443
Author(s):  
Paúl Carrión-Mero ◽  
F. Javier Montalván ◽  
Fernando Morante-Carballo ◽  
Carolina Loor-Flores de Valgas ◽  
Boris Apolo-Masache ◽  
...  
Keyword(s):  
Water Quality ◽  
Numerical Model ◽  
Coastal Aquifer ◽  
Transport Model ◽  
Local Development ◽  
Resource Scarcity ◽  
Database Analysis ◽  
Flow And Transport ◽  
Vulnerable Communities

Coastal aquifers are part of the natural resources contributing to local development and promote resilience in the most vulnerable communities near the sea. Manglaralto, an Ecuadorian coastal parish, is affected by water resource scarcity. The increase in salinity and deterioration of the water quality is generated by the local and floating population’s demand, causing an increase in the Total Dissolved Solids (TDS) concentrations and decreasing the aquifer’s piezometric levels. The aim is to establish a numerical model of flow and transport of the Manglaralto coastal aquifer by using hydrogeological data and Visual Transin software, relating the hydraulic importance of a dyke’s design (“tape”) and its impact on the quality of the water. The methodology is (i) hydrogeological database analysis, (ii) the system’s recharge concerning the soil water balance, (iii) the boundary conditions of the flow and transport model and, (iv) the results and validation of the numerical simulation. The results configure the importance of the coastal aquifer’s artificial recharge in the area where the tape is located, as reflected in the increase in piezometric levels and the decrease in salinity in wells near the sea. In conclusion, the numerical model of flow and transport allows expanding the knowledge of the variation of the piezometric levels and TDS concentrations over time, the importance of recharge in the hydrogeological system’s operation, and correct community management resilience and projection to sustainable development.

scholarly journals Contribution of Internal Nutrients Loading on the Water Quality of a Reservoir

Water ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1409 ◽  
Author(s):  
Hye Won Lee ◽  
Yong Seok Lee ◽  
Jonggun Kim ◽  
Kyoung Jae Lim ◽  
Jung Hyun Choi
Keyword(s):  
Water Quality ◽  
Sediment Load ◽  
Transport Model ◽  
Three Dimensional ◽  
Algal Growth ◽  
Nutrient Concentrations ◽  
Internal Load ◽  
Phosphorus Flux

Sediment plays an important role in the water quality of a lake by acting as both a nutrient source and sink. The amount of phosphorus and nitrogen in the water depends on the internal load from the sediment as well as the external load. To estimate the effects of sediment load on the water quality of a reservoir, we applied a three-dimensional hydrodynamic and transport model based on the benthic chamber experimental results at Euiam Lake, South Korea. As shown in the sensitivity analysis results, the eutrophication period could be significantly extended by a change of phosphorus flux rates from the sediments. The increased phosphorus flux from the sediments intensifies the algal growth of Euiam Lake, which could cause serious algal bloom during spring and fall. This study provides information on nutrient concentrations in the sediment of Euiam Lake, verifies the role of the sediment as a source or sink of nutrients, and evaluates the effect of sediment release of nutrients and contaminants on water quality. This research is a useful tool in determining the effects of internal load in lakes and establishing the operation guideline for sediment management in order to maintain feasible water quality for beneficial use.

scholarly journals Impact of decreasing water demand on bank filtration in Saxony, Germany

2009 ◽  
Vol 2 (2) ◽  
pp. 101-126 ◽  
Author(s):  
T. Grischek ◽  
D. Schoenheinz ◽  
C. Syhre ◽  
K. Saupe
Keyword(s):  
Water Quality ◽  
Drinking Water ◽  
Surface Water ◽  
Water Demand ◽  
Bank Filtration ◽  
Raw Water ◽  
Management Options ◽  
Flow And Transport ◽  
High Degree

Abstract. Bank filtration has been of main importance for the drinking water supply in Germany for many decades. The water quality of pumped raw water from bank filtration sites depends to a high degree on the water quality of the infiltrating surface water and the landside groundwater, the mixing portion of both as well as the flow and transport conditions in the aquifer. Since the improvement of river water quality and a drastic decrease in water demand during the last 15 years in Germany, the influence of landside groundwater quality has become more important for the raw water quality of waterworks relying on bank filtration. The hydrogeologic analysis of three bank filtration sites in Saxony and the management of abstraction rates and well operation in response to fluctuating water demand are discussed. In conclusion, a general overview on management options for bank filtration sites is provided.

Effects of Sediment Dredging on Water Quality of Meiliang Lake

2011 ◽  
Vol 90-93 ◽  
pp. 2619-2623
Author(s):  
Fu Long Chen ◽  
Jing Wang
Keyword(s):  
Water Quality ◽  
Numerical Model ◽  
Bottom Sediment ◽  
Lake Water ◽  
Lake Water Quality ◽  
Sediment Dredging ◽  
Tai Lake ◽  
Before And After

Meiliang Lake is located at north of Tai lake, it is one of the most important part of Tai Lake. Water quality of Meiliang Lake is being worse because the TP, TN and COD is released from the bottom sediment. So th goverment is decided to dredg the bottom sediment to improve the water quality. This paper used WASP5 numerical model to simulate the water quality of Meiliang Lake before and after the sediment dredging. The results show that sediment dredging is useful for improving the water quality of Meiliang Lake.

scholarly journals Groundwater Flow and Transport Model in Cecina Plain (Tuscany, Italy) using GIS processing

2015 ◽  
Vol 4 (1) ◽  
Author(s):  
Riccardo Armellini ◽  
Elena Baldini ◽  
Dario Del Seppia ◽  
Fabrizio Franceschini ◽  
Natacha Gori ◽  
...  
Keyword(s):  
Numerical Model ◽  
Groundwater Flow ◽  
Conceptual Model ◽  
Environmental Protection Agency ◽  
Transport Model ◽  
Maximum Flow ◽  
Flow And Transport ◽  
Groundwater Aquifer ◽  
Groundwater Flow And Transport ◽  
Two Phases

This work provides a groundwater flow and transport model of trichlorethylene and tetrachlorethylene contamination in the Cecina’s coastal aquifer. The contamination analysis, with source located in the Poggio Gagliardo area (Montescudaio, Pisa), was necessary to optimize the groundwater monitoring and remediation design. The work was carried out in two phases: • design of a conceptual model of the aquifer using GIS analysis of many stratigraphic, chemical and hydrogeological data, collected from 2004 to 2012 in six aqueduct wells; • implementation of a groundwater flow and transport numerical model using the MODFLOW 88/96 and MT3D code and the graphical user interface GroundWaterVistas 5. The conceptual model hypothesizes a multilayer aquifer in the coastal plain extended to the sandy-clay hills, recharged by rainfall and by the Cecina River. The aquifer shows important hydrodynamic features affecting both the contamination spreading, due to the presence of a perched and heavily polluted layer separate from the underlying productive aquifer, and the hydrological balance, due to a thick separation layer that limits exchanges between the river and the second groundwater aquifer. The numerical model, built using increasingly complex versions of the initial conceptual model, has been calibrated using monitoring surveys conducted by the Environmental Protection Agency of Regione Toscana (ARPAT), in order to obtain possible forecast scenarios based on the minimum and maximum flow periods, and it is currently used as a tool for decision support regarding the reclamation and/or protection of the aquifer. Future developments will regard the implementation of the multilayer transport model, based on a new survey, and the final coupling with the regional hydrological model named MOBIDIC.

scholarly journals A STUDY ON WATER QUALITY OF ISAHAYA RESERVOIR WITH A NUMERICAL MODEL INCORPORATING THE BUDGETS OF BIOLOGIGCAL NUTRIENT TRANSITION

2014 ◽  
Vol 70 (6) ◽  
pp. II_159-II_166
Author(s):  
Yoshihiro YOKOYAMA ◽  
Sachiko YOSHITSUGU ◽  
Akihiko FUJII ◽  
Masataka NAKASHIMA ◽  
Tadashi UCHIDA ◽  
...  
Keyword(s):  
Water Quality ◽  
Numerical Model

scholarly journals Impact of decreasing water demand on bank filtration in Saxony, Germany

2010 ◽  
Vol 3 (1) ◽  
pp. 11-20 ◽  
Author(s):  
T. Grischek ◽  
D. Schoenheinz ◽  
C. Syhre ◽  
K. Saupe
Keyword(s):  
Water Quality ◽  
Drinking Water ◽  
Surface Water ◽  
Groundwater Quality ◽  
Water Demand ◽  
Bank Filtration ◽  
Raw Water ◽  
Flow And Transport ◽  
High Degree

Abstract. Bank filtration has been of great importance to the drinking water supply in Germany for many decades. The water quality of pumped raw water from bank filtration sites depends to a high degree on the water quality of the infiltrating surface water and the landside groundwater, the mixed portion of both, as well as the flow and transport conditions in the aquifer. Following the improvement of river water quality and a drastic decrease in water demand during the last 20 years in Germany, the influence of landside groundwater quality has become more important for the raw water quality of waterworks relying on bank filtration. The hydrogeologic analysis of three bank filtration sites in Saxony and the management of abstraction rates and well operation in response to fluctuating water demand are discussed.

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