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Policy Priority Model for Management of Lake Sentani Waters Degradation After Flash Floods Using the A'WOTMIC Method

Walukow Auldry F., Triwiyono, Lumbu Albert, Gultom Monika, Sukarta I. Nyoman

Journal of Ecological Engineering

2023

Vol. 24, nr 6

239--248

Most of the pollution levels of Lake Sentani waters in the Expo watershed (92%) have been mildly and moderately polluted, while only a small proportion (8%) still meet quality standards. The condition of the level of heavy pollution will be dangerous for the life of living things, especially fish and have an impact on humans. This study aims to analyze the priorities of the Sentani Lake pollution management policy in the strength-opportunity (SO), strength-threat (ST), weakness-opportunity (WO), and weakness-threat (WT) strategies with the A'WOT method. The results showed that the policy priorities that first needed to be implemented immediately in the SO strategy were to Improve Enforcement of Environmental Law with an eigen value of 0.196. The priority of the policy strategy that first needs to be immediately implemented in the WO strategy is to make regional regulations by utilizing Government and community support with an eigen value of 0.267. The first policy priority that needs to be immediately implemented in the ST strategy is to use government authority in the environment to control environmental pollution and damage with an eigenvalue of 0.494. The first policy priority needs to be immediately implemented in the WT strategy is to improve environmental law enforcement so that lake water is not polluted with an eigen value of 0.202.

Spatial Assessment and Mapping of Water Quality in Lake Sentani (Indonesia) Using In-Situ Data and Satellite Imagery

Tanjung Rosye Hefmi Rechnelty, Indrayani Ervina, Hamuna Baigo, Agamawan Lalu Panji Imam, Alianto

Ecological Engineering & Environmental Technology

2023

Vol. 24, iss. 9

71--83

This study aims to examine the water quality of Lake Sentani using both in-situ data and satellite remote sensing data. In-situ data was taken in July 2023 at 18 sampling sites, including temperature, DO, pH, TDS, and water transparency. In-situ data is also used to develop and validate algorithms for estimating water quality from satellite remote sensing data. Multi-temporal Landsat-8 satellite imagery was used to spatially and temporally map the surface water quality of Lake Sentani. In-situ data showed temperature, DO, pH, TDS, and water transparency ranging from 29.3°C to 31.8°C, 1.7 mg/L to 7.9 mg/L, 7.75 to 8.64, 23 mg/L to 46 mg/L, and 2.28 m to 2.94 m, respectively. Only water transparency does not meet the quality standards for water quality (class 1 and class 2), while the other parameters meet class 1 to class 3 quality standards for surface water samples. The accuracy of the algorithm used and the resulting one has a low Mean Absolute Error value, namely 0.81 (temperature), 0.37 (DO), 4.84 (TDS), and 0.12 (water transparency). The temperature and TDS concentrations from the satellite imagery data ranged from 28.110°C to 33.918°C, and 7.829 mg/L to 102.702 mg/L, respectively. Both of these parameters still meet water quality standards. The DO concentrations ranged from 2.228 mg/L to 12.562 mg/L, and water transparency ranged from 0.424 m to 3.151 m. The concentration of DO and water transparency do not meet quality standards in several parts of Lake Sentani, especially in November and August.