A sediment record of trophic state change in an Arkansas (USA) reservoir

2014 ◽  
Vol 51 (3) ◽  
pp. 393-403 ◽  
Author(s):  
Byron Winston ◽  
Sonja Hausmann ◽  
Jaime Escobar ◽  
William F. Kenney
Keyword(s):  
Trophic State ◽  
State Change ◽  
Sediment Record

A sediment record of recent nutrient loading and trophic state change in Lake Norrviken, Sweden

2008 ◽  
Vol 42 (3) ◽  
pp. 325-341 ◽  
Author(s):  
Joyanto Routh ◽  
Preetam Choudhary ◽  
Philip A. Meyers ◽  
Bhishm Kumar
Keyword(s):  
Trophic State ◽  
Nutrient Loading ◽  
State Change ◽  
Sediment Record

Lake trophic state change and constant algal composition following dilution and diversion

1992 ◽  
Vol 1 (3) ◽  
pp. 173-197 ◽  
Author(s):  
Eugene B. Welch ◽  
Richard P. Barbiero ◽  
Debra Bouchard ◽  
Clain A. Jones
Keyword(s):  
Trophic State ◽  
State Change ◽  
Lake Trophic State ◽  
Algal Composition

Response of sediment characteristics to trophic state change at submerged macrophyte zones in a large shallow Lake Wuliangsuhai, China

2006 ◽  
Vol 25 (S1) ◽  
pp. 10-11
Author(s):  
Zhenying Liu ◽  
Zhaohui Jin ◽  
Yawei Li ◽  
Jiujun Gu ◽  
Tielong Li ◽  
...  
Keyword(s):  
Shallow Lake ◽  
Trophic State ◽  
Submerged Macrophyte ◽  
State Change ◽  
Sediment Characteristics ◽  
Large Shallow Lake

Train/Test Drug-State Change Disrupts Avoidance but not Escape Responding

1992 ◽  
Author(s):  
Cynthia J. Heinzen ◽  
Dennis C. Wright
Keyword(s):  
State Change ◽  
Test Drug ◽  
Drug State

Assessment of the Current Trophic State of Lake Onega by Primary Production of Phytoplankton

2007 ◽  
Vol 43 (5) ◽  
pp. 87-90 ◽  
Author(s):  
Ye. V. Tekanova ◽  
T. M. Timakova
Keyword(s):  
Primary Production ◽  
Trophic State ◽  
Lake Onega

APLIKASI CITRA LANDSAT 8 OLI UNTUK IDENTIFIKASI STATUS TROFIK WADUK GAJAH MUNGKUR WONOGIRI, JAWA TENGAH

2017 ◽  
Vol 19 (2) ◽  
pp. 113
Author(s):  
Kusuma Wardani Laksitaningrum ◽  
Wirastuti Widyatmanti
Keyword(s):  
Chlorophyll A ◽  
Total Phosphorus ◽  
Trophic State ◽  
Water Clarity ◽  
Coefficient Of Determination ◽  
Physical Factors ◽  
Landsat 8 ◽  
Trophic State Index ◽  
Landsat 8 Oli ◽  
State Index

<p align="center"><strong>ABSTRAK</strong></p><p class="abstrak">Waduk Gajah Mungkur (WGM) adalah bendungan buatan yang memiliki luas genangan maksimum 8800 ha, terletak di Desa Pokoh Kidul, Kecamatan Wonogiri, Kabupaten Wonogiri. Kondisi perairan WGM dipengaruhi oleh faktor klimatologis, fisik, dan aktivitas manusia yang dapat menyumbang nutrisi sehingga mempengaruhi status trofiknya. Tujuan dari penelitian ini adalah mengkaji kemampuan citra Landsat 8 OLI untuk memperoleh parameter-parameter yang digunakan untuk menilai status trofik, menentukan dan memetakan status trofik yang diperoleh dari citra Landsat 8 OLI, dan mengevaluasi hasil pemetaan dan manfaat citra penginderaan jauh untuk identifikasi status trofik WGM. Identifikasi status trofik dilakukan berdasarkan metode <em>Trophic State Index</em> (TSI) Carlson (1997) menggunakan tiga parameter yaitu kejernihan air, total fosfor, dan klorofil-a. Model yang diperoleh berdasar pada rumus empiris dari hasil uji regresi antara pengukuran di lapangan dan nilai piksel di citra Landsat 8 OLI. Model dipilih berdasarkan nilai koefisien determinasi (R<sup>2</sup>) tertinggi. Hasil penelitian merepresentasikan bahwa nilai R<sup>2</sup> kejernihan air sebesar 0,813, total fosfor sebesar 0,268, dan klorofil-a sebesar 0,584. Apabila nilai R<sup>2 </sup>mendekati 1, maka semakin baik model regresi dapat menjelaskan suatu parameter status trofik. Berdasarkan hasil kalkulasi diperoleh distribusi yang terdiri dari kelas eutrofik ringan, eutrofik sedang, dan eutrofik berat yaitu pada rentang nilai indeks 50,051 – 80,180. Distribusi terbesar adalah eutrofik sedang. Hal tersebut menunjukkan tingkat kesuburan perairan yang tinggi dan dapat membahayakan makhluk hidup lain.</p><p><strong>Kata kunci: </strong>Waduk Gajah Mungkur, citra Landsat 8 OLI, regresi, TSI, status trofik</p><p class="judulABS"><strong>ABSTRACT</strong></p><p class="Abstrakeng">Gajah Mungkur Reservoir is an artificial dam that has a maximum inundated areas of 8800 ha, located in Pokoh Kidul Village, Wonogiri Regency. The reservoir’s water conditions are affected by climatological and physical factors, as well as human activities that can contribute to nutrients that affect its trophic state. This study aimed to assess the Landsat 8 OLI capabilities to obtain parameters that are used to determine its trophic state, identifying and mapping the trophic state based on parameters derived from Landsat 8 OLI, and evaluating the results of the mapping and the benefits of remote sensing imagery for identification of its trophic state. Identification of trophic state is based on Trophic State Index (TSI) Carlson (1997), which uses three parameters there are water clarity, total phosphorus, and chlorophyll-a. The model is based on an empirical formula of regression between measurements in the field and the pixel values in Landsat 8 OLI. Model is selected on the highest value towards coefficient of determination (R<sup>2</sup>). The results represented that R<sup>2</sup> of water clarity is 0.813, total phosphorus is 0.268, and chlorophyll-a is 0.584. If R<sup>2</sup> close to 1, regression model will describe the parameters of the trophic state better. Based on the calculation the distribution consists of mild eutrophic, moderate eutrophic, and heavy eutrophic that has index values from 50.051 to 80.18. The most distribution is moderate eutrophication, and it showed the high level of trophic state and may harm other living beings.</p><p><strong><em>Keywords: </em></strong><em>Gajah Mungkur Reservoir, </em><em>L</em><em>andsat 8 OLI satellite imagery, regression, TSI, trophic state</em></p>

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