Open AccessSpatial and Temporal Analysis of Dissolved Oxygen (DO) and Biological Oxygen Demand (BOD) Concentrations in Rawa Pening Lake, Semarang Regency
Author(s) -
Muhammad Handoko,
Alfred Jansen Sutrisno
Publication year - 2021
Publication title -
jurnal geografi gea/jurnal geografi gea
Language(s) - English
Resource type - Journals
eISSN - 2549-7529
pISSN - 1412-0313
DOI - 10.17509/gea.v21i1.32330
Subject(s) - biochemical oxygen demand , hydrology (agriculture) , environmental science , swamp , drainage basin , ecosystem , chemical oxygen demand , pollution , inlet , ecology , geography , environmental engineering , wastewater , geology , biology , oceanography , cartography , geotechnical engineering
Lake Rawa Pening comes from a spring that comes out of the swamp, besides that there are several rivers that empties into Rawa Pening, including: Galeh River, Torong River, Panjang River, Muncul River, Parat River, Legi River, Pitung River, Praginan River And the Rengas River. There are three problems that cause damage to the Rawa Pening Lake ecosystem, namely damage to the water catchment area, damage to the lake border, and water pollution. This study aims to analyze Dissolved Oxygen (DO) and Biological Oxygen Demand (BOD) spatially and temporally due to damage to the lake ecosystem. The method used is Inverse Distance Weighted (IDW), where 12 sample point locations were taken, there were 10 sample points representing each village (lake inlet and utilization) and 2 sample points representing the center and outlet of the lake. The average DO yield in September 2020 was 6.8 mg / L, then in October 2020 it was 4.65 mg / L and in November 2020 it was 3.04 mg / L. Then the average BOD in September 2020 was 3.16 mg / L, then in October 2020 it was 2.6 mg / L and in November it was 1.53 mg / L, so it can be seen that the DO variable and BOD both decreased from September to November 2020.