A decision support system for emergency response to groundwater resource pollution in an urban area (Ljubljana, Slovenia)

Janža, Mitja

doi:10.1007/s12665-014-3662-2

Cited by 27 publications

(18 citation statements)

References 31 publications

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“…11) located closer to the Sava River (Fig. 2), where an intensive groundwater recharge from the river has been interpreted (Janža, 2015), show annual fluctuations which follow the air or surface water temperature changes with a lag time of about 6 months.…”

Section: Groundwater Temperaturementioning

confidence: 97%

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Research of the geological and geothermal conditions for the assessment of the shallow geothermal potential in the area of Ljubljana, Slovenia

Janža¹,

Lapanje²,

Šram³

et al. 2017

Geologija

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Shallow geothermal energy is a renewable source of energy. Using it provides benefits for climate, health and economy. A prerequisite for its efficient and sustainable use is the knowledge of its potential as well as the barriers that limit its use. The paper presents the preliminary results of research carried out within the GeoPLASMA-CE project for the assessment of the shallow geothermal potential in the area of the City of Ljubljana. By compiling existing geological data and field work, a detailed geological map of the study area was elaborated. The spatial distribution of thermal conductivity was estimated with measurements of thermal conductivity on 47 representative samples of 18 lithostratigraphic units and field measurements in unconsolidated sediments at 12 localities. The measured values range between 0.63 and 5.18 Wm -1 K -1 . Continuous groundwater temperature measurements in 17 observation wells with depth to 118 m show relatively small temperature changes over time of 5 months. The measured values on the Ljubljansko polje range between 10.6 °C and 14.6 °C, while in the Ljubljansko barje the temperature increases up to 15.6 °C. Multi-level groundwater temperature measurements in 9 observation wells indicate three different conditions: both negative and positive temperature gradients and a constant temperature in different depths of the aquifer, which reflects the deeper geothermal or hydrogeological conditions and the anthropogenic impact. IzvlečekPlitva geotermalna energija je obnovljiv vir energije. Njena raba omogoča ugodne učinke na podnebje, zdravje in gospodarstvo. Pogoj za učinkovito in trajnostno rabo geotermalne energije je poznavanje potenciala, kakor tudi ovir, ki omejujejo njeno rabo. V članku smo predstavili prve rezultate raziskav za oceno plitvega geotermalnega potenciala na območju mesta Ljubljana, ki se izvajajo v okviru projekta GeoPLASMA-CE. Z usklajevanjem obstoječih geoloških podatkov in terenskimi raziskavami je bila izdelana natančna geološka karta. Prostorska porazdelitev toplotne prevodnosti kamnin (18 litostratigrafskih enot) je ocenjena z meritvami na 47 reprezentativnih vzorcih in s terenskimi meritvami nekonsolidiranih sedimentov na 12 lokacijah. Izmerjene toplotne prevodnosti kamnin so v razponu med 0,63 in 5,18 Wm -1 K -1 . Zvezne meritve temperature podzemne vode v 17 opazovalnih vrtinah do globine 118 m kažejo relativno majhne spremembe v 5 mesečnem obdobju. Izmerjene vrednosti na Ljubljanskem polju so v razponu med 10,6 °C in 14,6 °C, na Ljubljanskem barju pa naraščajo do 15,6 °C. Temperature podzemne vode izmerjene na različnih globinah v 9 vrtinah kažejo tri različne razmere: negativni in pozitivni temperaturni gradient ter konstantno temperaturo v različnih globinah vodonosnika, kar odraža globlje geotermalne ali hidrogeološke razmere ter antropogeni vpliv.

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Section: Groundwater Temperaturementioning

confidence: 97%

“…The Ljubljansko polje aquifer is unconfined, recharged mainly from the Sava River and partly from rainfall (Janža, 2015). The recharge from the Sava River is intensive in the north-western part of the Ljubljansko polje; in the eastern part, groundwater is drained into the river.…”

Section: Hydrogeologymentioning

confidence: 99%

Research of the geological and geothermal conditions for the assessment of the shallow geothermal potential in the area of Ljubljana, Slovenia

Janža¹,

Lapanje²,

Šram³

et al. 2017

Geologija

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“…Groundwater flow and transport simulations were carried out using the MIKE SHE/MIKE 11 modeling framework [47], which enabled transient simulation of the most important processes of the hydrological cycle in the study area. The solute transport model used in the study [38] is a refined and local version of the calibrated regional hydrological model [48]. The regional model (Figure 1) is a spatially distributed (200 m grid cells) and transient model with implemented daily values of time-dependent variables (temperature, precipitation, river levels and discharges at boundaries, groundwater level observations, abstractions, and leakage from the water supply system).…”

Section: Groundwater Transport Modelmentioning

confidence: 99%

Nitrogen Mass Balance and Pressure Impact Model Applied to an Urban Aquifer

Janža

Prestor

Pestotnik

et al. 2020

Water

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The assurance of drinking water supply is one of the biggest emerging global challenges, especially in urban areas. In this respect, groundwater and its management in the urban environment are gaining importance. This paper presents the modeling of nitrogen load from the leaky sewer system and from agriculture and the impact of this pressure on the groundwater quality (nitrate concentration) in the urban aquifer located beneath the City of Ljubljana. The estimated total nitrogen load in the model area of 58 km2 is 334 ton/year, 38% arising from the leaky sewer system and 62% from agriculture. This load was used as input into the groundwater solute transport model to simulate the distribution of nitrate concentration in the aquifer. The modeled nitrate concentrations at the observation locations were found to be on average slightly lower (2.7 mg/L) than observed, and in general reflected the observed contamination pattern. The ability of the presented model to relate and quantify the impact of pressures from different contamination sources on groundwater quality can be beneficially used for the planning and optimization of groundwater management measures for the improvement of groundwater quality.

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“…The system gathers data from a monitoring network, and using numerical modeling techniques and expert knowledge, it supports the detection of pollution in the groundwater, the simulation of pollution propagation as well as decision making. The system provides an important foundation for proactive water resource management [15].…”

Section: Group Decision Support Systems (Gdss) and Emergency Managementmentioning

confidence: 99%

Group Decision Support Systems for Emergency Management and Resilience: CoastalProtectSIM

Zhao

Chen

et al. 2017

Proceedings of the 50th Hawaii International Conference on System Sciences (2017)

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A decision support system for emergency response to groundwater resource pollution in an urban area (Ljubljana, Slovenia)

Cited by 27 publications

References 31 publications

Research of the geological and geothermal conditions for the assessment of the shallow geothermal potential in the area of Ljubljana, Slovenia

Research of the geological and geothermal conditions for the assessment of the shallow geothermal potential in the area of Ljubljana, Slovenia

Nitrogen Mass Balance and Pressure Impact Model Applied to an Urban Aquifer

Group Decision Support Systems for Emergency Management and Resilience: CoastalProtectSIM

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