Resolving conflicting objectives in the management of the Plastiras Lake: can we quantify beauty?

Christofides, A.; Efstratiadis, Andreas; Koutsoyiannis, Demetris; Sargentis, G.-Fivos; Hadjibiros, Kimon

doi:10.5194/hess-9-507-2005

Cited by 18 publications

(10 citation statements)

References 15 publications

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“…The results of a multi-criteria analysis, given the methodological weaknesses and arbitrariness (Christofides et al 2005), help the delimitation of the problem; they can indicate a solution without determining it. It is clear from Figure 2 as well as from more analytical data (Research group 2002) that the choice of +780 m leads to non acceptable water and landscape quality, while choices of +790 m and +788 m lead to excessively low release with a relatively small environmental benefit.…”

Section: Resultsmentioning

confidence: 99%

Multi-criteria reservoir water management

Hadjibiros

Katsiri²,

Andreadakis³

et al. 2013

Global NEST Journal

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EXTENDED SUMMARYThe Plastiras dam was constructed in the late 1950s mainly for electric power production, but it has also partially covered irrigation needs and water supply of the plain of Thessaly. Later, the site has been designated as an environment conservation zone because of ecological and landscape values, while tourist activities have been developed around the reservoir. Irrigation of agricultural land, hydroelectric production, drinking water supply, tourism, ecosystem water quality and scenery conservation have evidently been conflicting targets for many years. Good management would require a multi-criteria decision making.Historical data show that the irregular water release has resulted in a great annual fluctuation of the reservoir water level. This situation could be improved by a rational management of abstractions. Apparently, higher release leads simultaneously to more power production and to irrigation of a larger agricultural land. Moreover, demands for electricity and for irrigation are partially competing to each other, due to different optimal time schedules of releases. On the other hand, higher water release leads to lower water level in the reservoir and, therefore, it decreases the beauty of the scenery and deteriorates the trophic state of the lake. Such degradation affects the tourist potential as well as the quality of drinking water supplied by the reservoir.A multi-criteria approach uses different scenarios for the minimum permissible water level of the reservoir, if a constant annual release is applied. The minimum level concept is a simple and functional tool, because it is understood by people, easily certified and incorporated into regulations. The quantity of water that would be yearly available is a function of the minimum level allowed. The water quality depends upon the trophic state of the lake, mainly the concentration of chlorophyll-a, which determines the state of eutrophication and is estimated by water quality simulation models, taking into account pollutant loads such as nitrogen and phosphorus. The value of the landscape is much depending on the water level of the lake, because for lower levels a dead-zone appears between the surface of the water and the surrounding vegetation. When this dead zone is large, it seems lifeless and the lake appears partially empty. Quantification of this visual effect is not easy, but it is possible to establish a correspondence between the aesthetic assessment of the scenery and the minimum allowed reservoir level.Using results from hydrological analysis, water quality models and landscape evaluation, it seems possible to construct a multi-criteria table with different criteria described against alternatives and with a plot of three relative indices against the minimum level allowed. However, decision making has to take into account the fact that comparison or merging of indices corresponding to different criteria analysis encompasses a degree of arbitrariness. More objective decisions would be possible if different benefits and cost...

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Section: Resultsmentioning

confidence: 99%

Multi-criteria reservoir water management

Hadjibiros

Katsiri²,

Andreadakis³

et al. 2013

Global NEST Journal

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“…So the results are useful for the policy makers around the country and abroad that are making decisions regarding control strategies of environmental problems in other similar lakes. And also the results could be a contribution to the management of water conflicts between human and ecosystems [10], [11].…”

Section: Discussionmentioning

confidence: 99%

Applying a BP Neural Network Approach to the Evolution Stage Classification of China Rift Lakes

Zhang¹,

Zeng²,

Yang³

2014

IJMO

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Abstract-The evolution stage classification which contains adolescence, adulthood, and old age of China rift lakes was constructed by using BP neural network model. In this paper, the model was applied to eleven lakes from Yunnan Plateau Lakes region and the middle and lower reaches of the Yangtze River plain. Through the selection of training samples, test samples and optimal number of hidden layer nodes to determine, the precision of BP neural network classification is supposed suitable for evolution stage classification of rift lakes. According to the classification results, dianchi lake is an old age lake, erhai lake, chenghai lake, xingyun lake, yilong lake, qilu lake, yangzong lake and chaohu lake are all in adulthood, and fuxian lake, lugu lake and poyang lake are in adolescence.

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“…The above phenomenon was discussed and interpreted in related papers [55,56]. According to the analysis made based on the physical properties, the appearance of the landscape and the questionnaires of the observers, the result was that between normal dead zone and subnormal dead zone, the transformation of the latter zone when the level of the lake decreased was a problem for the aesthetic value of the landscape [57].…”

Section: Landscape Analysis the Case Of Plastiras Lakementioning

confidence: 99%

Stochastic Evaluation of Landscapes Transformed by Renewable Energy Installations and Civil Works

et al. 2019

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Renewable energy (RE) installations and civil works are beneficial in terms of sustainability, but a considerable amount of space in the landscape is required in order to harness this energy. In contemporary environmental theory the landscape is considered an environmental parameter and the transformation of the landscape by RE works has received increasing attention by the scientific community and affected societies. This research develops a novel computational stochastic tool the 2D Climacogram (2D-C) that allows the analysis and comparison of images of landscapes, both original and transformed by RE works. This is achieved by a variability characterization of the grayscale intensity of 2D images. A benchmark analysis is performed for art paintings in order to evaluate the properties of the 2D-C for image analysis, and the change in variability among images. Extensive applications are performed for landscapes transformed by RE works. Results show that the 2D-C is able to quantify the changes in variability of the image features, which may prove useful in the landscape impact assessment of large-scale engineering works.

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Resolving conflicting objectives in the management of the Plastiras Lake: can we quantify beauty?

Cited by 18 publications

References 15 publications

Multi-criteria reservoir water management

Multi-criteria reservoir water management

Applying a BP Neural Network Approach to the Evolution Stage Classification of China Rift Lakes

Stochastic Evaluation of Landscapes Transformed by Renewable Energy Installations and Civil Works

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