Horizontal distribution of chlorophyll-a and water quality on Delta Wulan Estuary, Demak Regency, Central Java, Indonesia

Abstract

The overflow of water from the Wulan River has an impact on the amount of nutrients and pollutants that enter the Delta Wulan Estuary. Abundant nutrient content greatly affects the level of primary productivity, especially chlorophyll-a content. The study aimed to determine the horizontal distribution of chlorophyll-a and water quality in the Delta Wulan estuary waters. Sampling was carried out in June 2023 at 12 stations on Delta Wulan Estuary. Demak Regency. Based on the analysis results, the highest chlorophyll-a content was found at station 12 (10.59 - 12.20 mg/l). The nitrate content was found at station twelve (9.2 - 10.0 mg/l), and the highest value of phosphate content was found at stations 10 and 12, with a range of 0.22 - 0.25 mg/l. The range of sea surface temperatures ranges from 29.3–33.2°C. The salinity content value has ranged from 30.0 – 32.0 ppt. It can be concluded that water quality data can support the content of chlorophyll-a in the waters of the Wulan Delta Estuary.