Comparing methods to estimate chloride natural background levels to assess sea water intrusion

2021 ◽  
Author(s):  
David Pulido-Velazquez ◽  
Leticia Baena-Ruiz ◽  
Denitza Voutchkova ◽  
Birgitte Hansen ◽  
Klaus Hinsby ◽  
...  
Keyword(s):  
Sea Water ◽  
Anthropogenic Impacts ◽  
Salt Water ◽  
Salt Water Intrusion ◽  
Natural Background ◽  
Horizon 2020 ◽  
Water Intrusion ◽  
Background Levels ◽  
Research And Innovation ◽  
Perform Sensitivity Analysis

<p>In order to assess the anthropogenic impacts on groundwater quality we generally need to identify the natural conditions or Natural background levels (NBLs) within groundwater systems, which are used as references to assess the evolution of the contamination status. This information, in addition to the threshold values (TVs), which are derived from NBLs and based on specific criteria values for legitimate water uses and the environment (terrestrial and aquatic ecosystems), is required to appropriately assess of the chemical status of groundwater in accordance with the European Water Framework Directive and to analyse and propose potential measures where they are required.</p><p>In literature, different methodologies are available to assess NBLs and reference TVs for different geochemical substances based on the available measurements of groundwater salinity (e.g. based on probability plots). In this work we analyze and compare three previously proposed methods for derivation of chloride NBLs, which is a conservation solute and is closely related to salt water intrusion in inland and coastal aquifers. We discuss and compare their applicability in pilots located in different settings (southern /northern European / Mediteranean/ North Sea /Baltic Sea) covering different typologies (detrital, karstic, fissured aquifers) and management issues (overexploitation, land use and land cover changes, etc). We perform sensitivity analysis to different constraints applied to remove samples affected by human activity (Nitrate and the brackish saline constraints) in the assessment of NBLs. Finally, based on this analysis, we propose a general approach for derivation of NBLs that could be applied to any of the tested pilots as well as other similar settings in Europe.</p><p> </p><p>This research has been partially supported by the SIGLO-AN project (RTI2018-101397-B-I00) from the Spanish Ministry of Science, Innovation and Universities (Programa Estatal de I+D+I orientada a los Retos de la Sociedad).</p><p>This work has been partially supported by the GeoE.171.008-TACTIC and GeoE.171.008-HOVER projects from GeoERA organization funded by European Union’s Horizon 2020 research and innovation program.</p>

scholarly journals ANALISIS TERHADAP PERUBAHAN SALINITAS AIR TANAH DANGKAL PADA SISTEM AKUIFER TAK TERTEKAN CEKUNGAN JAKARTA

2018 ◽  
Vol 9 (1) ◽  
Author(s):  
Robertus Haryoto Indriatmoko
Keyword(s):  
Ground Water ◽  
Sea Water ◽  
Salt Water ◽  
Primary Data ◽  
Salt Water Intrusion ◽  
Aquifer System ◽  
Water Intrusion ◽  
Graphic Analysis ◽  
Salinity Data ◽  
Salinity Levels

The study on ground water salinity changes in unconfine aquifer system, is the study of hydrostatic equilibrium between the fresh ground water and salty ground water, aquifer unconfine restricted to coastal. The main objective of the aspects examined, namely: (i) To identify the level of intrusion of sea water in the basin aquifer system taktertekan Jakarta. The purpose and methodology of the study are as follows: (i) The primary data (1995-2009) and secondary (2010), including salinity data attributes, including ground water level, coordinates (UTM) and groundwater salinity levels (ii). Regression analysis of the relationship between the data (EC, Cl- and TDS). (Iii). Analysis of the period 1995-2010 salinity map using GIS and graphic analysis. (Iv). The focus of the analysis in three zones transection (ZT), namely ZT-I west, ZT-II central and eastern ZT-III was unconfine aquifer system in the Jakarta basin. The conclusion of this study are: (i) Variable Cl- and TDS have a strong correlation to predict EC using the following equation Y = 3.45 X + 517.80 (R2 = 0.88) for the DHL and TDS = 1, 86 X + 132.86 (R2 = 0.99) , (ii) based on the results of the analysis of the level of sea water intrusion during the period 1995-2010 (15 years), the intrusion of sea water has reached 8 km from the coast in the ZT-III, in ZT-II reaches 5 km and at ZT-I at 4.8 km from the coastal. Analysis of the development of the distance from shore limit saltwater intrusion since 1982 for 28 years can be calculated that the rate of salt water intrusion in the transection zone I is 0.1 km/year, the transection zone II is 0.06 km/year and in the zone transecting III is 0.11 km/year. The main cause of major intrusion of sea water into the aquifer system of the mainland is the amount of groundwater pumping against excessive.Keywords :  salt water intrusion, unconfine aquifer, aquifer system, Jakarta basin, recharge, salinity, electrical conductivity.

scholarly journals Prediksi Intrusi Air Laut Berdasarkan Nilai Daya Hantar Listrik dan Total Dissolved Solid di Kabupaten Tangerang

2019 ◽  
Vol 8 (4) ◽  
pp. 243
Author(s):  
Roh Santoso Budi Waspodo ◽  
Silvia Kusumarini ◽  
Vita Ayu Kusuma Dewi
Keyword(s):  
Sea Water ◽  
Salt Water ◽  
Primary Data ◽  
Negative Slope ◽  
Salt Water Intrusion ◽  
Sea Water Intrusion ◽  
Water Intrusion ◽  
Observation Area ◽  
Measurement Results ◽  
Total Dissolved Solid

Intrusion of sea water is the infiltration of sea water into the soil. This might be caused by a groundwater excessive exploration. Tangerang District is one of the areas that have great potential sea water intrusion. The aim of research was to predict the limit of salt water intrusion based on the value of DHL and TDS. The primary data were measured using a TOA EC meter CM-14P and then were processed using Surfer 9.0 software and ArcGIS. The measurement results was compared with PAHIAA Decision (1986) and Carroll’s Classification (1962). The results showed that the intrusion area could be identified by DHL and TDS values. On the area located far from the beach, intrusion was influenced by the presence of a river in the region. This was indicated by the regression analysis that showed a correlation between distance and value DHL/TDS with a negative slope value. Based on DHL and TDS parameters in observation area, the groundwater conditions in  Tangerang District within a radius of 0.095 km to 5 km from the littoral areas are categorized as medium intrusion zone (slightly brackish water) with DHL 1500-1999 μmhos/cm and TDS values 1000-3000 mg/LU.

Sea water intrusion and salt water intrusion in the coastal area of Laizhou Bay

1998 ◽  
Vol 43 (12) ◽  
pp. 983-992 ◽  
Author(s):  
Xue Yuqun ◽  
Wu Jichun ◽  
Xie Chunhong ◽  
Zhang Yongxiang
Keyword(s):  
Coastal Area ◽  
Sea Water ◽  
Salt Water ◽  
Salt Water Intrusion ◽  
Laizhou Bay ◽  
Sea Water Intrusion ◽  
Water Intrusion

scholarly journals Assessment of Sea Water Intrusion in Muthupettai Block

2016 ◽  
Vol 3 (3) ◽  
Author(s):  
B. Pavithra ◽  
M. Renganathan
Keyword(s):  
Tamil Nadu ◽  
Artificial Recharge ◽  
Sea Water ◽  
Salt Water ◽  
Coastal Region ◽  
Geographical Information ◽  
Salt Water Intrusion ◽  
Mixing Index ◽  
Sea Water Intrusion ◽  
Water Intrusion

<div><p><em>Salt water intrusion into coastal aquifers is potentially a major problem in the coastal region of Muthupettai block in Thiruthuraipoondi taluk (Thiruvarur District, Tamil Nadu), hence in order to assess the vulnerability area, ground water study should be done. By the water quality variations sea water mixing index is assessed. Seawater mixing index is used to describe the vulnerability area and the extension of intrusion over the study area. Thematic maps of factors influencing the sea water intrusion were prepared and overlaid using Geographical Information System (GIS). By the vulnerability mapping, the suitable area for the remediation technique of sea water intrusion that should be practiced in the study area will be decided. Rain water harvesting and artificial recharge techniques are more useful as a tool in remediation of salt water intrusion. Estimation of surplus run-off is also very important in planning artificial recharge schemes.</em></p></div>

Approximation for Salt-Water Intrusion in Unconfined Coastal Aquifer

Ground Water ◽  
1980 ◽  
Vol 18 (2) ◽  
pp. 147-151 ◽  
Author(s):  
B. K. Panigrahi ◽  
A. Das Gupta ◽  
A. Arbhabhirama
Keyword(s):  
Coastal Aquifer ◽  
Salt Water ◽  
Salt Water Intrusion ◽  
Water Intrusion

scholarly journals GIS analysis of effects of future Baltic Sea level rise on the island of Gotland, Sweden

2016 ◽  
Author(s):  
Karin Ebert ◽  
Karin Ekstedt ◽  
Jerker Jarsjö
Keyword(s):  
Baltic Sea ◽  
Sea Level Rise ◽  
Sea Level ◽  
Coastal Aquifers ◽  
Salt Water ◽  
Global Perspective ◽  
Salt Water Intrusion ◽  
The Baltic Sea ◽  
Water Intrusion ◽  
The Baltic

Abstract. Future sea level rise as a consequence of global warming will affect the world's coastal regions. Even though the pace of sea level rise is not clear, the consequences will be severe and global. Commonly the effects of future sea level rise are investigated for relatively vulnerable development countries; however, a whole range of varying regions need to be considered in order to improve the understanding of global consequences. In this paper we investigate consequences of future sea level rise along the coast of the Baltic Sea island of Gotland, Sweden, with the aim to fill knowledge gaps regarding comparatively well-suited areas in non-development countries. We study both the quantity of loss of infrastructure, cultural and natural values for the case of a two metre sea level rise of the Baltic Sea, and the effects of climate change on seawater intrusion in coastal aquifers, causing the indirect effect of salt water intrusion in wells. We conduct a multi-criteria risk analysis by using Lidar data on land elevation and GIS-vulnerability mapping, which gives formerly unimaginable precision in the application of distance and elevation parameters. We find that in case of a 2 m sea level rise, 3 % of the land area of Gotland, corresponding to 99 km2, will be inundated. The features most strongly affected are items of touristic or nature values, including camping places, shore meadows, sea stack areas, and endangered plants and species habitats. In total, 231 out of 7354 wells will be directly inundated, and the number of wells in the high-risk zone for saltwater intrusion in wells will increase considerably. Some values will be irreversibly lost due to e.g. inundation of sea stacks and the passing of tipping points for sea water intrusion into coastal aquifers; others might simply be moved further inland, but this requires considerable economic means and prioritization. With nature tourism being one of the main income sources of Gotland, monitoring and planning is required to meet the changes. Seeing Gotland in a global perspective, this island shows that holistic multi-feature studies of future consequences of sea level rise are required, to identify overall consequences for individual regions.

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