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All Journal LIMNOTEK - Perairan Darat Tropis di Indonesia OLDI (Oseanologi dan Limnologi di Indonesia) LIMNOTEK
Cynthia Henny, Cynthia
PSLH UGM
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Engineering Environmental Science

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Kondisi Lingkungan dan Status Trofik Danau Rawa Pening di Jawa Tengah Sulastri, -; Henny, Cynthia; Handoko, Unggul
Oseanologi dan Limnologi di Indonesia Vol 1, No 3 (2016)
Publisher : Oseanologi dan Limnologi di Indonesia

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Abstract

Danau Rawa Pening merupakan satu dari 15 danau di Indonesia yang menjadi prioritas untuk diselamatkan dari kerusakan karena mengalami masalah eutrofikasi. Tujuan penelitian ini adalah untuk mengetahui status terkini lingkungan perairan danau dan tingkat eutrofikasi sebagai dasar pengendalian eutrofikasi di Danau Rawa Pening. Muatan sedimen, kualitas air, dan konsentrasi nutrien diamati di aliran air masuk ke danau, di perairan danau, dan di saluran air keluar dari danau. Pengamatan dilakukan pada Mei, Juni, Juli, dan Agustus 2013. Parameter kejernihan, kekeruhan, temperatur, DO, pH, dan konduktivitas diamati secara langsung di perairan danau. Parameter nutrien, TSS, dan klorofil-a dianalisis di laboratorium dengan metode standar. Indeks Status Trofik digunakan untuk menentukan tingkat eutrofikasi danau. Kondisi hidroklimatologi menunjukkan secara musiman fluktuasi volume dan debit air keluar danau mengikuti pola fluktuasi curah hujan. Muatan sedimen di saluran air masuk ke danau lebih tinggi daripada di dalam danau dan di alur air keluar danau. Hal ini mengindikasikan bahwa Danau Rawa Pening berperan sebagai penampungan dan pengendapan sedimen serta nutrien dari sungai di sekitarnya. Secara spasial dan temporal kondisi kualitas air di danau menunjukkan variasi yang tinggi. Konsentrasi nutrien yang tinggi di danau pada musim hujan dan kemarau mengindikasikan bahwa sumber nutrien tidak hanya berasal dari luar tetapi juga dari dalam danau itu sendiri. Hasil penelitian ini menunjukkan Danau Rawa Pening merupakan danau eutrofik dan fosfor diduga sebagai faktor utama penyebab eutrofikasi dan pertumbuhan eceng gondok.
WATER QUALITY AND QUANTITY ISSUES OF URBAN LAKES IN MEGACITY JAKARTA Henny, Cynthia; Meutia, Ami A.
LIMNOTEK - Perairan Darat Tropis di Indonesia Vol 21, No 2 (2014)
Publisher : Research Center for Limnology

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Abstract

The lakes in urban megacity Jakarta, called as ?setu or situ? by the local people, play a central role in integrated water resources management. Despite its pivotal role in maintaining the balance of urban water system, they have not received sufficient attention. Rapid urban development in a very distinct urban watershed type of lake?s surroundings has impacted on the water quantity and quality of urban lakes in megacity Jakarta. Chronic problems faced by downstream area in megacity Jakarta such as flash floods in the rainy season and water scarcity in the dry season have indicated that the lakes have not been managed and functioned well. Human and nature disturbances such as shoreline encroachment, shoreline erosion, garbage dump and inflow from untreated sewage and urban runoff have polluted the lake water and reduced its volume capacity. Nearly half of the existing lakes have reduced from 10 to > 50% of its water volume capacity due to lake area shrinkage, siltation and even excessive growth ofinvasive macrophytes. The lakes are mostly in disturbed to damaged environmental conditions. Lakes in urban and rural villages have less in water quantity and higher solids, organic matter, nutrients and even fecal bacteria concentrations than the lakes in planned residential, high-rise residential and industrial areas types of urban surroundings. As the lakes in the urban village and industrial area, elevated toxic metal concentrations have become public concern due to lake hygiene problems. Elevated nutrient concentrations have caused the lake eutrophication, where some lakes have suffered from excessive macrophyte coverage, algal bloom even toxic cyanobacterial bloom. The urban lakes in megacity Jakarta constantly have been degrading physically and ecologically affecting its water quantity and quality which is increasing the threat to human?s health and impact future human?s resilience in urban megacity Jakarta.
The impact of weather Condition Changes on Vertical Distribution of Sulfides in Lake Maninjau Based on Observation Data Putri, Mutiara Rachmat; Jasalesmana, Taofik; Abdurrachman, Mirzam; Henny, Cynthia; Nomosatryo, Sulung; Albani, Alif Shidqie
LIMNOTEK Perairan Darat Tropis di Indonesia Vol. 30 No. 1 (2024)
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/limnotek.2024.2203

Abstract

Sulfide is a crucial parameter in volcanic lakes, as its levels and fluctuations in the lake determine the origin of sulfide and the extent of its impact on the lake ecosystem. In stratified lakes, the sulfide produced tends to be retained beneath the oxic layer. The sulfides rise towards the surface as the oxic layer thins triggered by decreased water column thermal stratification. Meanwhile, the strength or weakness of thermal stratification is greatly influenced by weather conditions. Lake Maninjau is a volcanic lake with a relatively high sulfide content. Its vertical distribution in the water column is highly dependent on the stratification of the water column. When stratification disappears, sulfide rises to the surface (locally known as tubo belerang) and has a negative impact on surface biota. The objective of this study is to examine the distribution of sulfides in the water column of Lake Maninjau under two different weather conditions. We perform two surveys to measure physicochemical parameters and sulfide concentration on 26‒29 November 2022 and 25‒26 August 2023 considering the seasonal pattern. We found that air temperatures and sunshine duration combined with precipitation and wind speed drive the thermal stratification of the water column. The lower air temperature, shorter sunshine duration, higher precipitation, and stronger wind speed in the first survey (west monsoon) compared with the second survey (east monsoon) resulted in lower stratification and triggered the elevated sulfide to the surface. In the middle of the lake, the surface sulfide measured during the first survey was 4.16 µg/L. Meanwhile, in the second survey, it was only observed at 1.16 µg/L. The distribution of sulfides within the water column of Lake Maninjau is regulated by the stratification of the water column, a process directly impacted by weather conditions.
Co-Authors - Sulastri Abdurrachman, Mirzam Albani, Alif Shidqie Jasalesmana, Taofik Melanie R. Mormille, Melanie R. Meutia, Ami A. Putri, Mutiara Rachmat Sulung Nomosatryo Unggul Handoko, Unggul