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Distribution Patterns of Chlorophyll-a and its Relationship with Phosphate, Nitrate in Banjir Kanal Barat and Banjir Kanal Timur, Semarang, Indonesia

Suryoputro Agus Anugroho Dwi, Pramesti Rista Anggita, Zainuri Muhammad, Maslukah Lilik

Ecological Engineering & Environmental Technology

2023

Vol. 24, iss. 2

186--193

Banjir Kanal Barat (BKB) and Banjir Kanal Timur (BKT) are widely used for various community activities such as residential areas, industry, fish cultivation, and auction. Community activity around BKB and BKT will affect N and P nutrient inputs, which further affects phytoplankton abundance. In this study, phytoplankton biomass was estimated through chlorophyll-a (chl-a) measurements. The purpose of this study was to determine the distribution of the chl-a and determine the influence of phosphate and nitrate in front of the estuary from BKB and BKT. Sampling was carried out at 8 stations from each estuary and was carried out in the dry season. The concentration of chl-a, phosphate, and nitrate is further described in the form of a distribution pattern based on the interpolation method with ArcGIS 10.2 software. The results showed that the average ± sd of chl-a, respectively was 15,781 ± 16.90 mg/m3 and 17,710 ± 15.31 mg/m3, phosphate was 0.0174 ± 0.0057 ppm and 0.0096 ± 0.0164 ppm, nitrate was 2.9086 ± 1.1824 ppm and 1.6919 ± 1.6316 ppm. The distribution pattern of chlorophyll-a and phosphate decreases in concentration towards the sea, while nitrate forms an irregular pattern and has a different pattern in each estuary. Nutrient phosphate has a positive correlation with chlorophyll-a.

Rozwiązania projektowo-techniczne 1. etapu realizacji Kampusu LPP Fashion Lab

Pachowski Piotr

Builder

2020

R.24, nr 2

30--34

W artykule omówiono rozwiązania techniczne związane z projektem i budową budynku biurowego w Gdańsku. Przedstawiono problemy związane z głębokim posadowieniem na terenie zagrożonym podtopieniami, wymagającym wykonania poziomej przesłony przeciwfiltracyjnej połączonej z obudową ścianami szczelinowymi. Opisano sposób modularnego kształtowania konstrukcji z betonu architektonicznego i dochodzenia do efektu metodą prób na budynku wzorcowym (mock-up). W rozwiązaniach projektowych znalazły się nietypowe stropy monolityczne z zatopionym układem chłodzącym BKT i wbudowanymi profilami stalowymi dla podwieszenia oświetlenia oraz dach szedowy, indywidualizujący charakter budynku.

In this paper, technical solutions, connected with the project and construction of the office building in Gdansk, have been discussed. Solutions and problems of waterproof barrier (horizontal jet-grouting diaphragm connected with slurry walls), required due to the deep foundation in the flood danger area, have been presented. Modular shaping of the RC structure of architectural concrete and testing the final effects on mock-up, have been described. In the design solutions there have been developed: non typical floor slabs with embedded cooling system BKT and build in steel profiles (due to suspended lighting) as well as the roof folded plate structure, which distinguishes the building form.