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Titolo:
Reservoir trophic state evaluation using Landsat TM images
Autore:
Cheng, KS; Lei, TC;
Indirizzi:
Natl Taiwan Univ, Hydrotech Inst, Dept Agr Engn, Taipei 10764, Taiwan NatlTaiwan Univ Taipei Taiwan 10764 Dept Agr Engn, Taipei 10764, Taiwan
Titolo Testata:
JOURNAL OF THE AMERICAN WATER RESOURCES ASSOCIATION
fascicolo: 5, volume: 37, anno: 2001,
pagine: 1321 - 1334
SICI:
1093-474X(200110)37:5<1321:RTSEUL>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
COASTAL WATERS; CHLOROPHYLL; LAKES; QUANTIFICATION; EUTROPHICATION; REFLECTANCE;
Keywords:
Landsat TM; remote sensing; reservoir; trophic state;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Cheng, KS Natl Taiwan Univ, Hydrotech Inst, Dept Agr Engn, 1 Sect 4,Roosevelt Rd, Taipei 10764, Taiwan Natl Taiwan Univ 1 Sect 4,Roosevelt Rd TaipeiTaiwan 10764 iwan
Citazione:
K.S. Cheng e T.C. Lei, "Reservoir trophic state evaluation using Landsat TM images", J AM WAT RE, 37(5), 2001, pp. 1321-1334

Abstract

Reservoir water quality is traditionally monitored and evaluated based on field data. Collecting and analyzing field water quality data are costly and time consuming tasks, and whether a limited number of field data truly characterize the spatial variation of the trophic state within a vast water body is often disputed. In this study we utilize Landsat TM data to estimatethe water quality and trophic state of the Te-Chi reservoir in Central Taiwan. A modified multi-parameter model of Carlson's trophic state index (TSI) was developed for the Te-chi reservoir. Water quality parameters (concentration of chlorophyll-a, total phosphorous measurement, and secchi disk depth) required by the model are found to have high correlations with combinations of TM bands. Therefore, TM data are used to map the trophic state of the reservoir. TM-derived TSI maps of the reservoir reveal that, in summer, the trophic state in the reservoir generally improves from upstream to downstream and that zones of distinct trophic state exist. Atrophic state indexbased on secchi disk depth may give erroneous values in the upstream section of the reservoir pool due to high sediment concentration in the reservoir inflow. We conclude that the Te-Chi reservoir is eutrophic or worse in summer and meso-eutrophic in winter. Implementation of best management practices to reduce nonpoint source pollution in the upstream watershed is highlyrecommended. This study demonstrates the capability of mapping the trophicstate in impounded water bodies using the Landsat TM data.

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Documento generato il 23/01/20 alle ore 06:21:23