Stochastic trophic level index model: A new method for evaluating eutrophication state

2021 ◽  
Vol 280 ◽  
pp. 111826
Author(s):  
Yang Ding ◽  
Jinyong Zhao ◽  
Wenqi Peng ◽  
Jing Zhang ◽  
Quchang Chen ◽  
...  
Keyword(s):  
Trophic Level ◽  
New Method ◽  
Index Model ◽  
Trophic Level Index

scholarly journals Status of water quality and level of trophic in Juanda Reservoir of Purwakarta Regency, West Java, Indonesia

2021 ◽  
Vol 322 ◽  
pp. 01016
Author(s):  
Iis Jubaedah ◽  
Pigoselpi Anas ◽  
Toni Ruchimat ◽  
Joni Haryadi
Keyword(s):  
Water Quality ◽  
Trophic Level ◽  
Trophic Status ◽  
Class Ii ◽  
Class Iii ◽  
West Java ◽  
Water Quality Status ◽  
Secondary Function ◽  
Quality Status ◽  
Trophic Level Index

Juanda reservoir is one of the reservoirs located in Purwakarta Regency, West Java Province, Indonesia, whose primary function is hydropower, water resources for irrigation, industrial and drinking water, and secondary function for fisheries and tourism activities. Currently, an increase in activities around the existing reservoir has affected its water quality. In order to determine the water quality and trophic level status of the Juanda reservoir, research has been conducted within five stations during the period of August-December 2020. The water quality status includes physical, chemical, and biological parameters that compared with Store standards on Class II and III. Meanwhile, the trophic status was determined by Trophic Level Index (TLI) based on the parameters of transparency, chlorophyll-a, total nitrogen, and total phosphorus. The results show that the water quality status of Juanda reservoir has been contaminated Class III and heavily polluted Class II. The parameters that exceed include ammonia, nitrate, and BOD5. The Juanda reservoir's tropic status was in the eutrophic category, with TLI values ranging from 4.6 to 5.2.

Comparative Assessment of Water Quality with the Trophic Level Index and the Delphi Method in Lakes Rotoiti and Rotorua, New Zealand

2010 ◽  
Vol 45 (4) ◽  
pp. 479-489 ◽  
Author(s):  
David Hamilton ◽  
Arkadi Parparov
Keyword(s):  
Water Quality ◽  
New Zealand ◽  
Water Resources ◽  
Water Resources Management ◽  
Trophic Level ◽  
Delphi Method ◽  
Economic Activities ◽  
Lake Ecosystems ◽  
Resources Management ◽  
Trophic Level Index

Abstract We describe a case study involving the application of a water quality (WQ) assessment for Lakes Rotorua and Rotoiti, New Zealand. Our major objective was to compare an established water quality system based on a trophic level index (TLI) against an alternative Delphi method (DM) which uses an assembled expert panel including specialists in limnology and water resources management. The set of water quality indices (WQI) established with DM captures the major uses of water resources of the studied lake ecosystems: conservation and recreation. The set of permissible ranges for individual WQIs assessed with DM allows a “reference state” to be defined for WQ in the study lakes. The TLI and DM were closely correlated when eutrophication was the overarching issue, but much less so when resources and uses of the lake ecosystems were taken into consideration. Water resources management based around the TLI is commonly targeted at oligotrophication of aquatic ecosystems to improve WQ, often in association with reducing economic activities in watersheds. In contrast, the DM allows a more complete assessment that aligns with sustainable management of natural water resources but also includes the need for conservation.

scholarly journals Retrieving the Lake Trophic Level Index with Landsat-8 Image by Atmospheric Parameter and RBF: A Case Study of Lakes in Wuhan, China

2019 ◽  
Vol 11 (4) ◽  
pp. 457 ◽  
Author(s):  
Yadong Zhou ◽  
Baoyin He ◽  
Fei Xiao ◽  
Qi Feng ◽  
Jiefeng Kou ◽  
...  
Keyword(s):  
Trophic Level ◽  
Mean Squared Error ◽  
Rbf Neural Network ◽  
Atmospheric Correction ◽  
Atmospheric Parameter ◽  
Physical Parameters ◽  
Landsat 8 ◽  
Band Ratios ◽  
Model C ◽  
Trophic Level Index

The importance of atmospheric correction is pronounced for retrieving physical parameters in aquatic systems. To improve the retrieval accuracy of trophic level index (TLI), we built eight models with 43 samples in Wuhan and proposed an improved method by taking atmospheric water vapor (AWV) information and Landsat-8 (L8) remote sensing image into the input layer of radical basis function (RBF) neural network. All image information taken in RBF have been radiometrically calibrated. Except model(a), image data used in the other seven models were not atmospherically corrected. The eight models have different inputs and the same output (TLI). The models are as follows: (1) model(a), the inputs are seven single bands; (2) model(c), besides seven single bands (b1, b2, b3, b4, b5, b6, b7), we added the AWV parameter k1 to the inputs; (3) model(c1), the inputs are AWV difference coefficient k2 and the seven bands; (4) model(c2), the input layers include seven single bands, k1 and k2; (5) model(b), seven band ratios (b3/b5, b1/b2, b3/b7, b2/b5, b2/b7, b3/b6, and b3/b4) were used as input parameters; (6) model(b1), the inputs are k1 and seven band ratios; (7) model(b2), the inputs are k2 and seven band ratios; (8) model(b3), the inputs are k1, k2, and seven band ratios. We estimated models with root mean squared error (RMSE), model(a) > model(b3) > model(b1) > model(c2) > model(c) > model(b) > model(c1) > model(b2). RMSE of the eight models are 12.762, 11.274, 10.577, 8.904, 8.361, 6.396, 5.389, and 5.104, respectively. Model b2 and c1 are two best models in these experiments, which confirms both the seven single bands and band ratios with k2 are superior to other models. Results also corroborate that most lakes in Wuhan urban area are in mesotrophic and light eutrophic states.

scholarly journals Reference and current Trophic Level Index of New Zealand lakes: benchmarks to inform lake management and assessment

2020 ◽  
Vol 54 (4) ◽  
pp. 636-657
Author(s):  
Jonathan M. Abell ◽  
Paul van Dam-Bates ◽  
Deniz Özkundakci ◽  
David P. Hamilton
Keyword(s):  
New Zealand ◽  
Trophic Level ◽  
Lake Management ◽  
Trophic Level Index

Phytoplankton-based recovery requirement for urban lakes in the implementation of the Water Framework Directive’s ecological targets

2015 ◽  
Vol 44 (1) ◽  
Author(s):  
Agnieszka Napiórkowska-Krzebietke ◽  
Julita Dunalska
Keyword(s):  
Trophic Level ◽  
Trophic State ◽  
Phytoplankton Bloom ◽  
Ecological Status ◽  
Phytoplankton Assemblages ◽  
Urban Lakes ◽  
Ecological Targets ◽  
Good Ecological Status ◽  
Trophic Level Index

AbstractThis study focused on the determination of the phytoplankton-based recovery requirement, including bloom intensity thresholds in human-affected lakes, helpful in the restoration. The phytoplankton and physicochemical analyses were carried out on seven urban lakes in Kartuzy and Skępe. The Phytoplankton Metric for Polish Lakes was used to assess the ecological status and the Trophic Level Index was used to determine the trophic state. Only one lake had a good ecological status (meeting the WFD requirements for at least good status), whereas other lakes had poor or bad ecological status. All of them were eutrophic or hyper-eutrophic and the summer phytoplankton assemblages were dominated mainly by bloomforming cyanobacteria. The lowest phytoplankton bloom threshold of 2.6 mm

scholarly journals TINGKAT KESUBURAN PERAIRAN KOLONG PASCA GALIAN TAMBANG PASIR SIDODADI, PULAU SUGI BAWAH, PROVINSI KEPULAUAN RIAU

2020 ◽  
Vol 2 (2) ◽  
pp. 78
Author(s):  
Sunartri Agung ◽  
Tri Apriadi ◽  
Winny Retna Melani
Keyword(s):  
Trophic Level ◽  
Random Sampling ◽  
Trophic Level Index

Kolong Sidodadi merupakan genangan perairan yang terbentuk di lahan pasca tambang pasir darat di Pulau Sugi Bawah, tepatnya di Kampung Sidodadi, Kecamatan Moro, Kabupaten Karimun. Kolong ini dimanfaatkan sebagai sumber air baku oleh PDAM Tirta Karimun. Penelitian ini bertujuan untuk mengkaji kondisi parameter fisika, kimia, dan biologi serta tingkat kesuburan perairan Kolong Sidodadi, Kabupaten Karimun, Kepulauan Riau. Pengambilan sampel dilakukan secara random sampling sebanyak 30 titik sampling yang tersebar di Kolong Sidodadi. Parameter fisika, kimia, dan biologi perairan yang diukur yaitu suhu, kecerahan, pH, DO, nitrat, fosfat, dan klorofil-a. Kualitas perairan dianalisisberdasarkan kesesuaian baku mutu menurut Peraturan Pemerintah Republik Indonesia No. 82 Tahun 2001. Indeks kesuburan dihitung menggunakan metode Trophic Level Index (TLI). Hasil penelitian menunjukkan bahwa Kolong Sidodadi memiliki pH asam (rendah), konsentrasi nutrien N dan P tinggi, serta klorofil-a rendah. Nilai kesuburan berdasarkan indeks TLI berkisar 3,60-4,40 dengan rataan 4,00. Tingkat kesuburan perairan Kolong Sidodadi tergolong eutrofik (tinggi). Perlu menjadi perhatian terhadap nilai pH yang rendah karena air Kolong Sidodadi ini digunakan sebagai sumber air baku bagi PDAM Tirta Karimun. Selain itu, diperlukan kajian keanekaragaman dan kelimpahan fitoplankton sehingga dapat mengkonfrimasi konsentrasi klorofil-a yang menjadi komponen utama dalam penentuan tingkat kesuburan perairan.

Assessing the Eutrophication Status of Qixing Wetland and the Effect of Plants

2013 ◽  
Vol 807-809 ◽  
pp. 1870-1874
Author(s):  
Yi Xin Xu ◽  
Hua Yong Zhang ◽  
Zong Han Li ◽  
Fei Li ◽  
Xiang Xu
Keyword(s):  
Phragmites Australis ◽  
Plant Communities ◽  
Trophic Level ◽  
Vegetation Pattern ◽  
Nelumbo Nucifera ◽  
Maximum Efficiency ◽  
High Concentration ◽  
Nitrogen And Phosphorus ◽  
Typha Orientalis ◽  
Trophic Level Index

The comprehensive trophic level index has been applied to assess eutrophication status of QiXing Wetland. The five subzones of QiXing Wetland with different vegetation pattern have different eutrophication status. The comprehensive trophic level index is mainly affected by TN and TP at high concentration of nitrogen and phosphorus. Therefore, the plant communities can significantly influence on eutrophication status of the wetland through removing nitrogen and phosphorus in water. Three mainly dominant plants in wetland are Phragmites australis, Nelumbo nucifera and Typha orientalis Presl. The ability to remove nitrogen and phosphorus of these three plant communities were investigated. Typha orientalis Presl community has the maximum efficiency in removing nitrogen and phosphorus in water. Therefore, Typha orientalis Presl is more suitable for the purification of the water.

Selective Sampling and Orientation of Non-Homogeneous Tissues

1968 ◽  
Vol 26 ◽  
pp. 98-99
Author(s):  
C. C. Clawson ◽  
L. W. Anderson ◽  
R. A. Good
Keyword(s):  
Electron Microscopy ◽  
Electron Microscope ◽  
Light Microscopy ◽  
Random Sampling ◽  
New Method ◽  
Microscope Examination ◽  
Small Areas ◽  
Selective Sampling ◽  
Large Numbers ◽  
Specific Orientation

Investigations which require electron microscope examination of a few specific areas of non-homogeneous tissues make random sampling of small blocks an inefficient and unrewarding procedure. Therefore, several investigators have devised methods which allow obtaining sample blocks for electron microscopy from region of tissue previously identified by light microscopy of present here techniques which make possible: 1) sampling tissue for electron microscopy from selected areas previously identified by light microscopy of relatively large pieces of tissue; 2) dehydration and embedding large numbers of individually identified blocks while keeping each one separate; 3) a new method of maintaining specific orientation of blocks during embedding; 4) special light microscopic staining or fluorescent procedures and electron microscopy on immediately adjacent small areas of tissue.

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