&lt;title&gt;Analysis of hydrological changes in lakes of Asian arid zone by satellite data&lt;/title&gt;

Nakayama, Yasunori; Tanaka, S.; Sugimura, Toshiro; Endo, Kunihiko

doi:10.1117/12.298148

Cited by 8 publications

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“…Harris (1994) correlated the variation of water levels in a lake with precipitation and evaporation as an aid in his climate research. The interaction between hydrological changes observed in Lake Aral and certain regional environmental parameters has been studied by Nakayama et al (1997). Vázquez et al (2003) have studied the pattern of observed water surface area in relation with antecedent precipitation as a means for drawing zone maps that indicate flood frequencies.…”

Section: Introductionmentioning

confidence: 99%

The water regime of the Monegros playa-lakes as established from ground and satellite data

Álamo¹,

Herrero²

2005

Journal of Hydrology

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The Monegros playa-lakes are isolated saline wetlands, locally named "saladas", situated in a vulnerable semi-arid territory where agricultural expansion threatens the natural hydrologic cycle with regular artificial flooding, risking the survival of a valuable natural resource. This study aims to examine the water regime of these playalakesfrom climate data and available hydrologic records. These records are historicaland limited to a series of weekly measurements of depth and of water extent extractedfrom Landsat imagery. We have characterized the hydrological behavior of the playalakesby treating ground and satellite data separately. For this purpose, the playalakesare first grouped according to the water occurrence episodes. Then their hydrologic status is related to the previous rainfall and also to ET0, since there is a lack of local records of wind as well as brine or fresh water evaporation. The northern playa-lakes respond to rain faster than the southern ones. All playa-lakes have a significant relationship between water occurrence and rainfall accumulated within 180 days prior to an observation. A significant relationship between ET0 and water occurrence was found 1 *Corresponding author. E-mail address: ccastanneda@aragon.es (C. Castañeda), Fax: +34 976 716 335 2 for a shorter 15-day accumulation period. Quantifying the current water regime now is critical for monitoring the effects of expanding irrigation in adjacent lands. Remote sensing is well-suited to an environmental assessment for regions of difficult access with the added benefit of lowered field measurement cost. The hydrological data from the Monegros playa-lakes could be integrated with other playa environments worldwide to compare regionally specific climate conditions.

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Section: Introductionmentioning

confidence: 99%

The water regime of the Monegros playa-lakes as established from ground and satellite data

Álamo¹,

Herrero²

2005

Journal of Hydrology

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“…Changes in the water extent of playas and closed salt lakes have been estimated by remote sensing to asses changes in regional climate (Schneider et al 1985;Harris, 1994;Bryant, 1999;Birkett, 2000). Nakayama et al (1997) detected changes in the water area and volume of Central Asian lakes and related them to environmental parameters. Remote sensing provides a temporal perspective of the playa-lakes hydrology in the lack of historical data such as water levels (Al-Khudhairy et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Landsat monitoring of playa-lakes in the Spanish Monegros desert

Álamo

Herrero

Casterad

2005

Journal of Arid Environments

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Small playa-lakes in Monegros, Spain, are high-value habitats for endemisms, threatened by landscape transformations and development of newly irrigated lands. The purpose of monitoring these fragile habitats is to detect their future disturbance, i.e. the effects of changing their natural hydrological regime, such as increasing their flooding surface area and habitat degradation by fresh and polluted water flow inputs. Landsat imagery is used for this purpose, facing the lack of regular ground data about their hydrological regime and the land covers with ecological meaning. Five meaningful thematic classes have been established grouping spectral classes obtained from unsupervised classification together with the visual interpretation of the original bands, the IHS transformation and the principal component analysis. The scarce ground data were confronted with the images. Compared to field work, remote sensing is advantageous for monitoring these playa-lakes, providing reliable insight to understand these habitats. Examples of how this research advances our knowledge about the nature and response of this ecosystem to adverse environmental changes are presented. r

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Saline Wetlands' Fate in Inland Deserts: An Example of 80 years' Decline in Monegros, Spain

2011

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Wetlands inventory is one of the goals of conservation plans on a national scale and a global scale. Inventories are needed for longterm monitoring or for identifying lost wetlands and those where restoration is feasible. In this article, we present an updated inventory of the saline wetlands of Southern Monegros, Spain. We depicted the evolution of these saline wetlands, locally named saladas with a unique long-term retrospective study based on aerial photographs from 1927. Their inventory has been accomplished through a map analysis based on a geographical information system using aerial photographs and orthophotographs, topographic maps, unpublished local studies and field surveys. Remaining vegetation, changes in soil moisture and colour, and geomorphology have been the key features in identifying the saladas. Their changes in number, size and shape have been driven by human pressure, the main modifier of landscape in the last 80 years. The information gathered will contribute to the awareness of stakeholders and decision makers for their conservation as natural resources. Moreover, our large retrospective approach is a consistent base from which to propose the inclusion of the saladas of Monegros in the Ramsar list of Wetlands of International Importance.

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<title>Analysis of hydrological changes in lakes of Asian arid zone by satellite data</title>

Cited by 8 publications

References 0 publications

The water regime of the Monegros playa-lakes as established from ground and satellite data

The water regime of the Monegros playa-lakes as established from ground and satellite data

Landsat monitoring of playa-lakes in the Spanish Monegros desert

Saline Wetlands' Fate in Inland Deserts: An Example of 80 years' Decline in Monegros, Spain

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