Drought impacts on the fresh water potential of a karst aquifer in Crete, Greece

Steiakakis, E.; Vavadakis, D.; Kritsotakis, M.; Voudouris, K.; Αnagnostopoulou, Christina

doi:10.1007/s12665-016-5509-5

Cited by 14 publications

(11 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Water potential of the major hydrogeological units of Crete are presented in Table 8 [14,15]. The intensive exploitation of groundwater, particularly by agricultural activity over the last 50 years, has led to a continual decline in groundwater level, while several coastal aquifers suffer from seawater intrusion [87]. In addition, the water quality of some aquifers has been degraded due to pollution from agricultural, industrial, and touristic activities.…”

Section: Groundwatermentioning

confidence: 99%

See 1 more Smart Citation

Challenges and Opportunities for Sustainable Management of Water Resources in the Island of Crete, Greece

Tzanakakis

Angelakιs

Paranychianakis

et al. 2020

Water

View full text Add to dashboard Cite

Crete, located in the South Mediterranean Sea, is characterized by long coastal areas, varied terrain relief and geology, and great spatial and inter-annual variations in precipitation. Under average meteorological conditions, the island is water-sufficient (969 mm precipitation; theoretical water potential 3284 hm3; and total water use 610 hm3). Agriculture is by far the greatest user of water (78% of total water use), followed by domestic use (21%). Despite the high average water availability, water scarcity events commonly occur, particularly in the eastern-south part of the island, driven by local climatic conditions and seasonal or geographical mismatches between water availability and demand. Other critical issues in water management include the over-exploitation of groundwater, accounting for 93% of the water used in agriculture; low water use efficiencies in the farms; limited use of non-conventional water sources (effluent reuse); lack of modern frameworks of control and monitoring; and inadequate cooperation among stakeholders. These deficiencies impact adversely water use efficiency, deteriorate quality of water resources, increase competition for water and water pricing, and impair agriculture and environment. Moreover, the water-limited areas may display low adaptation potential to climate variability and face increased risks for the human-managed and natural ecosystems. The development of appropriate water governance frameworks that promote the development of integrated water management plans and allow concurrently flexibility to account for local differentiations in social-economic favors is urgently needed to achieve efficient water management and to improve the adaptation to the changing climatic conditions. Specific corrective actions may include use of alternative water sources (e.g., treated effluent and brackish water), implementation of efficient water use practices, re-formation of pricing policy, efficient control and monitoring, and investment in research and innovation to support the above actions. It is necessary to strengthen the links across stakeholders (e.g., farmers, enterprises, corporations, institutes, universities, agencies, and public authorities), along with an effective and updated governance framework to address the critical issues in water management, facilitate knowledge transfer, and promote the efficient use of non-conventional water resources.

show abstract

Section: Groundwatermentioning

confidence: 99%

“…Such a project is believed to be a long-term and definitive solution to the water supply problem of the Iraklion municipality and the adjacent villages. Cross section of proposed underground infiltration gallery (adapted by [87] from [115]).…”

Section: Brackish Watersmentioning

confidence: 99%

Challenges and Opportunities for Sustainable Management of Water Resources in the Island of Crete, Greece

Tzanakakis

Angelakιs

Paranychianakis

et al. 2020

Water

View full text Add to dashboard Cite

show abstract

“…Its spatial concentration was totally removed from the western to central part of the island (from Chania to Heraklion prefecture) leading to an increased land degradation in the west with more areas experiencing bare soil expansion. This higher spatial expansion of barren land can partially be attributed to the decrease in annual precipitation, which is projected to be further reduced over the next decades [39]. The precipitation decreases in this period altered the groundwater recharge with adverse implications for water supply and agricultural activities.…”

Section: Discussion and Interpretationmentioning

confidence: 99%

Exploring the Impact of Various Spectral Indices on Land Cover Change Detection Using Change Vector Analysis: A Case Study of Crete Island, Greece

2020

View full text Add to dashboard Cite

The main objective of this study was to explore the impact of various spectral indices on the performance of change vector analysis (CVA) for detecting the land cover changes on the island of Crete, Greece, between the last two decades (1999–2009 and 2009–2019). A set of such indices, namely, normalized difference vegetation index (NDVI), soil adjusted vegetation index (SAVI), albedo, bare soil index (BSI), tasseled cap greenness (TCG), and tasseled cap brightness (TCB), representing both the vegetation and soil conditions of the study area, were estimated on Landsat satellite images captured in 1999, 2009, and 2019. Change vector analysis was then applied for five different index combinations resulting to the relative change outputs. The evaluation of these outputs was performed towards detailed land cover maps produced by supervised classification of the aforementioned images. The results from the two examined periods revealed that the five index combinations provided promising performance results in terms of kappa index (with a range of 0.60–0.69) and overall accuracy (with a range of 0.86–0.96). Moreover, among the different combinations, the use of NDVI and albedo were found to provide superior results against the other combinations.

show abstract

“…Visual MODFLOW, an integrated package combining MODFLOW, MODPATH, and Zone Budget, is the most complete and comprehensible modeling setting that can be applied conveniently in three-dimensional groundwater flow and contaminant transport simulations (Waterloo Hydrogeologic 2015). Fouépé Takounjou et al, (2009); Jovanovic (2009); Mondal and Singh (2009); Shi (2010); Mondal and Singh (2012); Saghravani et al, (2012); Steiakakis et al, (2016); Baharuddin et al, (2016); Kumar et al, (2017) and Sen et al, (2018) applied Visual MODFLOW for various research purposes. Based on the review study of research papers, Hariharan and Uma Shankar (2017) and Mondal (2019) found that Visual MODFLOW can be applied in a variety of groundwater flow simulation settings.…”

Section: Modflowmentioning

confidence: 99%

Envisaging the Sustainability of an Aquifer by Developing Groundwater Flow Model for a Part of ChoutuppalMandal, Nalgonda District, Telangana, India

Neupane

Mondal

Manglik

2020

Nepal Journal of Science and Technology

View full text Add to dashboard Cite

Recurring droughts and increased exploitation of groundwater to meet the growing water needs have resulted in the decline of regional groundwater level and dry, weathered zone in a part of the Choutuppal Mandal, Nalgonda district, Telangana, India. A groundwater model has been developed using an inventory of 20 observation wells for future pumping schemes to evolve a classic interface (Build: 4.6.0.168) of available wells. The developed model has been reviewed using Visual MODFLOW, and a base map is prepared for the sub-surface structure. The area spreading about 0.43 km2is conceptualized as a two-layered model consisting of a weathered layer overlying a fractured aquifer. The model has been digitized into grids of 5m×5m in each layer. The integrated finite difference method has been utilized to discretize the groundwater flow equation and simulate groundwater flow with the help of calculated parameters along with the boundary conditions and acting stresses. Results show that the computed groundwater levels are in good agreement with the observed heads, and groundwater is flowing from the South to the North direction. The estimated velocities vary from 0.01 to 1.95 m/d. The optimum pumping schemes have also been simulated up to the year 2022. It has been observed that the maximum pumping rate should not go beyond 24m3/day. Since the drinking water demand(10-15m3/day) in the study site is below this limit, it can be inferred that the aquifer will sustain and provide enough drinking water.

show abstract

Drought impacts on the fresh water potential of a karst aquifer in Crete, Greece

Cited by 14 publications

References 21 publications

Challenges and Opportunities for Sustainable Management of Water Resources in the Island of Crete, Greece

Challenges and Opportunities for Sustainable Management of Water Resources in the Island of Crete, Greece

Exploring the Impact of Various Spectral Indices on Land Cover Change Detection Using Change Vector Analysis: A Case Study of Crete Island, Greece

Envisaging the Sustainability of an Aquifer by Developing Groundwater Flow Model for a Part of ChoutuppalMandal, Nalgonda District, Telangana, India

Contact Info

Product

Resources

About