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Analysis of Shoreline Changes Period 1991 – 2001 Pasumpahan Island, Padang, West Sumatera Fifi Sanora; Rifardi Rifardi; Elizal Elizal
Jurnal Perikanan dan Kelautan Vol 28, No 1 (2023): February
Publisher : Faculty of Fisheries and Marine, Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jpk.28.1.31-36

Pasumpahan Island is an area that is affected by currents, waves and sedimentation processes because it is directly adjacent to the Indian Ocean and the mouth of the Pisang River, this causes changes in the coastline in the form of abrasion and accretion on the island. This study aims to determine the effect of currents, waves, and sedimentation processes on the rate of change of the shoreline for 10 years (1991-2001) on Pasumpahan Island. This research was conducted in March 2022 on Pasumpahan Island, Padang City, West Sumatra Province. The method used is a survey method to obtain primary data including current speed, heightwaves and sediments. The study method used is a quantitative method with a multi-temporal satellite imagery approachusing the Digital Shoreline Analysis System (DSAS) software with the End Point Rate (EPR) approach. The results of the analysis of current velocity values ranged from 0.21-0.28 m/s, wave heights ranged from 0.24-0.55 m, the average diameter of the sediment ranged from 0.83-1 Φ. The results of image data processing show that there has been a change in the shoreline in the form of low category abrasion (0.4 m/year), stable (1.42 m/year), and accretion (3.07 m/year) on Pasumpahan Island

Analysis of Inundation Area as an Impact of Sea Level Rise in Dumai City, Riau Province Ally Wibowo Situmorang; Mubarak Mubarak; Elizal Elizal
Jurnal Perikanan dan Kelautan Vol 28, No 2 (2023): June 2023
Publisher : Faculty of Fisheries and Marine, Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jpk.28.2.143-150

This research was carried out in December 2021-January 2022 in Dumai City District, Riau Province. The purpose of this study is to determine the rate of sea level rise based on analysis of tide data from 2001-2021 and to predict inundation areas in the next 20 years. This research method is a descriptive survey using remote sensing as an additional tool to show the results. Acquisition needs are in the form of primary data (land use and tide data) and secondary (slope data, elevation, land use, and tide data). These parameters are processed and analysed to describe the extent of the inundation by displaying a map of the City of Dumai. The results showed that the waters of Dumai City have a Formzhal number of 0.5, which means that the water area is classified as a mixed tide, semi-diurnal prevalence, with a sea level rise of 2.003 cm/year. Then, the numbers used to predict the height of sea level rise in the next 20 years are 0.973 m each. Furthermore, sea level height was analysed to obtain the inundation area for the next 20 years, it turns out that the inundation area each year is 11.89 ha

Ocean current circulation modeling in the Bengkalis Strait in the east spring Fajar Fajar; Elizal Elizal; Yusni Ikhwan Siregar
South East Asian Marine Sciences Journal Vol. 1 No. 1 (2023): September
Publisher : Science, Technology, and Education Care

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61761/seamas.1.1.15-21

The waters of the Bengkalis Strait are geographically very strategic, directly connected to the waters of the Malacca Strait and a strategic water transportation route. One of the complex phenomena that appears in the waters of the Bengkalis Strait is the phenomenon of current movement. This survey was conducted from June to August 2022. The survey location was in the Bengkalis Strait, Bengkalis Regency, Riau Province. The research aims to determine current patterns and sea level height during the highest tides and lowest low tides each month during the east season in the waters of the Bengkalis Strait. The method used is a Survey and a quantitative descriptive method. All data is processed using MIKE 21 software. First, Google Earth was used to create bathymetry data, and then the boundaries of the survey area were determined using MIKE 21. After obtaining the bathymetry, we continued with the flow model using MIKE 21 and then displayed the results. Obtained results: the highest tide occurred on 13/06/2022 at 13:00 WIB with an average current discharge of 0.14-0.16 m/s, and the lowest wave occurred on 13/06/2022 at 20.00 WIB with an average flow rate of 0.60-0.75 m/s

Analysis of Nitrate, Phosphate, and Phytoplankton Abundance Content in Apar Waters Pariaman City West Sumatra Adini Dwi Ratna Hafnizar; Syahril Nedi; Elizal Elizal
Jurnal Natur Indonesia Vol. 22 No. 2 (2024): October
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM) Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jnat.22.2.122-128

Apar Beach is one of the tourist destinations in North Pariaman District, Pariaman City, West Sumatra. These tourism activities can affect water quality. In addition to anthropogenic activities, several factors can affect the quality of these waters, among the compounds contained in Apar waters, namely the content of nitrates, phosphates, and the abundance of phytoplankton. This study aimed to determine nitrate and phosphate content, how phytoplankton abundance, and the relationship between nitrate, phosphate, and phytoplankton abundance. The survey method was used in this study. The results of this study showed nitrate content at station I of 0.82 mg/L. Station II is 0.78 mg/L and station III is 0.90 mg/L. while the phosphate content at station I is 0.72 mg/L. station II is 0.71 mg / l and station III is 0.73 mg/L. The average phytoplankton abundance at station I was 249.99 ind/l. Station II is 288.88 ind/l, and station III is 327.77 ind/L. The relationship between nitrate and phosphate concentration with phytoplankton abundance is obtained value (R2) 0.215, which means nitrate and phosphate affect phytoplankton abundance by 21.5%. In comparison, 78.5% is influenced by other factors, while the correlation coefficient value (r) of 0.464 means that nitrate and phosphate concentration with phytoplankton abundance has a moderate relationship

Reduction of Dispersant Pollutant (Linear Alkylbenzene Sulfonate) by Mangrove Plant (Rhizophora mucronata) Syahril Nedi; Irwan Effendi; Afrizal Tanjung; Elizal Elizal
Jurnal Natur Indonesia Vol. 21 No. 2 (2023): October
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM) Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/

Linear alkylbenzene sulfonate (LAS) is the main component of dispersants that function as cleaners of various materials. The increasing use of LAS causes this compound to dominantly pollute coastal waters. Phytoremediation is the most environmentally safe alternative to physical and chemical methods. One of the potential plants as a phytoremediator is Rhizophora mucronata. This research is an experiment as an application of LAS pollutant control by R.mucronata plants in waters. After acclimatization and preliminary tests, the implementation of LAS phytoremediation tests by R. mucronata plants in seawater media was carried out at concentrations of A1: 25 mg/L, A2: 100 mg/L, A3: 175 mg/L, A4: 250 mg/L, and A5: 325 mg/L and control (Control without plants) as a simulation of the presence of pollutants in coastal waters. The method used was a completely randomized design (CRD) with one treatment and 3 replications. The reduction of LAS concentration in the test media and its effect on R.mucronata leaf chlorophyll and dissolved oxygen were analyzed at week 2 to week 4. The analysis results showed that LAS compounds could be reduced to 91.48% at week 2 and 97.40% at week 4. Plant Water quality parameters (dissolved oxygen, temperature and pH) were measured daily. Based on the study results, LAS can be reduced by R.mucronata plants 87-90.4% in week 2 and 95.1-97.4% in week 4. LAS exclusion by plants had a significant impact on the reduction of leaf chlorophyll content until week 4. LAS reduction by R.mucronata in the media can increase dissolved oxygen content as an indication of improved water quality. R.mucronata plants can be used as an alternative to control LAS pollution in waters

Marine Water Quality Mapping in Rupat Strait with Modelling Hydrodynamics Chandra M Aulia; Syahril Nedi; Elizal Elizal
Tropical Marine Enviromental Sciences Vol. 3 No. 1 (2024)
Publisher : Department of Marine Science, Faculty of Fisheries and Marine Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/tromes.3.1.25-31

This research aims to analyze water quality and determine the status of quality standards in the waters of Rupat Strait. The method used in the study is comparative descriptive analysis and literature analysis. Hydrodynamic and water quality models with MIKE 21 Hydrodynamics and ECO Lab modules were used to examine the distribution of water quality parameters in the waters of Rupat Strait. The results showed that the waters of the Rupat Strait have a depth between 2-15 m with a velocity of 0.15-0.3 m/s. DO concentration has an interval of 5-6 mg/L, then BOD concentration has an interval of 0.8-2.4 mg/L, salinity has an interval of 17- 27‰, and temperature has an interval of 26-310C. Water quality in Rupat Strait is still within the quality standards. The pollution index calculation in Rupat Strait obtained values between 1<IP<5, indicating that Rupat Strait is still classified as lightly polluted

Analysis of Nitrate, Phosphate, and Phytoplankton Abundance Content in Apar Waters Pariaman City West Sumatra Adini Dwi Ratna Hafnizar; Syahril Nedi; Elizal Elizal
Jurnal Natur Indonesia Vol. 22 No. 2 (2024): October
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jnat.22.2.122-128

Apar Beach is one of the tourist destinations in North Pariaman District, Pariaman City, West Sumatra. These tourism activities can affect water quality. In addition to anthropogenic activities, several factors can affect the quality of these waters, among the compounds contained in Apar waters, namely the content of nitrates, phosphates, and the abundance of phytoplankton. This study aimed to determine nitrate and phosphate content, how phytoplankton abundance, and the relationship between nitrate, phosphate, and phytoplankton abundance. The survey method was used in this study. The results of this study showed nitrate content at station I of 0.82 mg/L. Station II is 0.78 mg/L and station III is 0.90 mg/L. while the phosphate content at station I is 0.72 mg/L. station II is 0.71 mg / l and station III is 0.73 mg/L. The average phytoplankton abundance at station I was 249.99 ind/l. Station II is 288.88 ind/l, and station III is 327.77 ind/L. The relationship between nitrate and phosphate concentration with phytoplankton abundance is obtained value (R2) 0.215, which means nitrate and phosphate affect phytoplankton abundance by 21.5%. In comparison, 78.5% is influenced by other factors, while the correlation coefficient value (r) of 0.464 means that nitrate and phosphate concentration with phytoplankton abundance has a moderate relationship.

Abundance and Distribution Patterns of Gastropods in the Intertidal Bay of Kambang Lengayang Sub-District, Southern Coastal District, West Sumatera Ichwanul Harif; Afrizal Tanjung; Elizal Elizal
Jurnal Natur Indonesia Vol. 19 No. 2 (2021): October
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jnat.19.2.37-42

This study aims to determine the abundance and distribution pattern of gastropods in the intertidal bay, Kambang Lengayang District, Pesisir Selatan Regency, West Sumatra. The benefits of this research are expected to be a reference or information for further research in Kambang Bay which in the end is expected to minimize the adverse effects of gastropod hunting. The research method used in this study is a survey method, namely direct observation and sampling which is divided into 3 stations where the sampling station 1 is taking in the coastal waters of the bay in an area where there is no community activity, station 2 is taking in the waters of the bay in the fishing trawl area. station 3 taking in the coastal waters of Kambang in the reclamation area. Based on the analysis of organic sedimentary material in the study area, the average value was obtained at station 1 (3.55%), station 2 (4.20%) and station 3 (3.33%). Based on the analysis, the sediment fraction that dominates each station is sand. The gastropods found at the study site were Clypeomorus bifasciata, Littoraria scabra and Cerithulata cingulata. The abundance of gastropods in the coastal waters of Kambang ranged from 2.33 to 5.00 Ind/m2. The results of the ANOVA test showed that the abundance of gastropods in the bay waters showed 0.214 beaches, indicating that the difference in abundance between stations was not significant. The gastropod pattern found at the study site is generally in groups

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