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KONDISI OSEANOGRAFI DI SELAT MATAK KABUPATEN KEPULAUAN ANAMBAS MELALUI MODEL HIDRODINAMIKA Riyadi, Agung; said, nusa idaman; Santos, Matih
Jurnal Air Indonesia Vol. 7 No. 2 (2014): Jurnal Air Indonesia
Publisher : Center for Environmental Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1262.804 KB) | DOI: 10.29122/jai.v7i2.2416

Abstract

This paper describes some of the general condition of the oceanographic parameters in the Strait Matak, Anambas Archipelago. The data flow is obtained by direct measurement by using a current meter types RCM-7. Simulation models using Mike 21. Mike flow pattern is divided into two seasons, namely west season (January) and the east season (August) and flow patterns ahead of the tide when the season is generally moving west to wards the south, it demonstrates the role of strong tidal influence the movement of waterin the study area. Flow velocity in the strait just before the tide on the west season reaches 1m/s.  Flow patterns at high tide on the west season looks still moving toward sthe south. The maximum flow velocity in the strait when the tide reaches 0.32 m/s, while the average speed in the area of the model is 0.12 m/s. Low tide towards the current pattern is still moving towards the south, it reinforces the notion that in addition to tidal windsare also very significant role in moving the flow, in this case that the current is moving toward the south. Flow velocity just before low tide reaches 0.85 m/s. Flow patterns at low tide shows the differences in the three previous conditions, the current in the strait to move out to the north toward the South China Sea. In condition slow tide, the tida lmore dominantly than the wind, this proved to even though the wind toward the south, the currents inthestraitis moving toward snorth along the tidal flow leading to the South China Sea. Flow velocity is quite varied location of modeling; flow velocity at low tide reaches 0.5m/s, with the average 0.15 m/s. Keywords: current and direction, wind, tide, model.
FAKTOR INTERNAL DAN EKSTERNAL YANG MEMPENGARUHI KINERJA KEUANGAN PDAM KOTA SURAKARTA Riyadi, Agung
JEJAK: Jurnal Ekonomi dan Kebijakan Vol 2, No 1 (2009): March 2009
Publisher : Semarang State University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jejak.v2i1.1455

Abstract

This research had an aims to analyse financial performance of PDAM, to analyse the internal andexternal factors that influenced financial performance of PDAM and to analyse the most dominant factoramong internal and external factors.This research reached the aims with the theory of financial performance, the theory of public goodsand the theory of turbulency economy. Mixing of all the theories brought to the hyphotesis that theinternal factors like price of water, revenue, and cost and the external factors like rate of inflation andexchange rate influenced financial performance of PDAM. This research used OLS without constantaregresion equation and Chow’s test to test the hyphotesis.This research showed that PDAM financial performance was good and consisted of debt structureperformance, financial efficiency performance, and profit performance. The internal and external factorsbuilt a linkage that influenced the financial performance. The internal factors that influenced the financialperformance were price of water, revenue, and cost. The external factors that influenced the financialperformance were rate of inflation and exchange rate. The most dominant factor was revenue. Thisresearch also showed that PDAM applied average cost pricing.Keywords: internal and external factors, regulated price, financial performance
INFORMASI DETEKSI SUMBERDAYA AIR TANAH ANTARA SUNGAI PROGO – SERANG, KABUPATEN KULON PROGO DENGAN METODE GEOLISTRIK Riyadi, Agung
Jurnal Teknologi Lingkungan Vol. 5 No. 1 (2004): JURNAL TEKNOLOGI LINGKUNGAN
Publisher : Center for Environmental Technology - Agency for Assessment and Application of Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/jtl.v5i1.298

Abstract

The demand for groundwater in developing countries is continuously increasing. It is used as industrial processes, drinking, agriculture, fishpond and irrigation. The reasons for this growth include agriculture, industrial processes, expanding cities, food production needed irrigation areas that urgently need groundwater supply. Actually now, in south Kulon Progo coast area, many people development agriculture with water supply from groundwater. From the measurement in the field concerning groundwater resources potential in thesouth Kulon Progo coast area, can be predicted that the fresh water resources be found as far as coast from Serang River until Progo River, with average wide 1.6 km and thick between 20 – 43 meter and with depth average 25 meter.
KAJIAN STATUS WADUK TIRTA SHINTA DAN KELAYAKANNYA UNTUK INDUSTRI ETHANOL DI KOTABUMI LAMPUNG UTARA Riyadi, Agung
Jurnal Teknologi Lingkungan Vol. 7 No. 3 (2006): JURNAL TEKNOLOGI LINGKUNGAN
Publisher : Center for Environmental Technology - Agency for Assessment and Application of Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/jtl.v7i3.394

Abstract

PT. Medco Ethanol Lampung has been constructed factory for cassavaand mollase processing in order to product Rectified-Ethanol at Talang JaliVillage, Kotabumi North Lampung. The estimation of capacity productionis around 190.000 liter per day. Maximum necessity of fresh water forfactory operasional is about 8.507 m /hari. For the measurement depthand water volume Tirta Shinta Reservoir get the volume is about3.155.434 m with the avarage depth for 1 – 6 meter, while the dischargeof water at outflow for agricultural is about 138.270 m per day at rainyseason. If the water from Tirta Shinta reservoir use for main factory, andthe total capacity reservoir only used 4.3 %, if nothing flow from riverbecause dry season, and now Tirta Shinta reservoir can be supply only17.7 month during dry season. Based on the environmental aspect, ifbetter, a fresh water supply for ethanol factory from river has a big rate offlow. This present, beside for farming activity and tourism, the most ofsurface water reservoir covered by water plant that make problem forfactory operational, specially for water pump.
IDENTIFIKASI POTENSI AIR TANAH DI KECAMATAN MANGKUBUMI TASIKMALAYA DENGAN METODE UJI POMPA Riyadi, Agung
Jurnal Teknologi Lingkungan Vol. 6 No. 2 (2005): JURNAL TEKNOLOGI LINGKUNGAN
Publisher : Center for Environmental Technology - Agency for Assessment and Application of Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/jtl.v6i2.339

Abstract

Pumping tests are carried out to determine how much groundwater taken from a well and what effects pumping will have on the aquifer. Theis recovery method aims to find out the aquifer characteristics such as transmisibility and permeability values. This method in principle observes the recovery of ground water surface. This reasearch location at Mangkubumi distric Tasiklamaya West Java. The value of transmisibilitas and permeabilitas in Mangkubumi district indicated the groundwater potential is good. Ground water flow (m3/day) between 684,02 at Cipawitra until 4.617,19 at Cipari Tasikmalaya. Hidrolik Conductivity between 0.39 – 2.63 (m2/day).
POTRET KONDISI PERAIRAN DI PULAU KARANG CONGKAK KEPULAUAN SERIBU, DKI JAKARTA Riyadi, Agung
Jurnal Air Indonesia Vol. 3 No. 2 (2007): Jurnal Air Indonesia
Publisher : Center for Environmental Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (575.032 KB) | DOI: 10.29122/jai.v3i2.2336

Abstract

Pulau Panggang in Kepulauan Seribu district have  many small corall island sand, many reef flat the island. Approximately have  four island reefs and there are relatively wide, that are a P. Karang Semak Daun, P. Karang Beras, P. Karang Congkak and P. Karang Bongkok. Karang Congkak Island  has reef flat and its area is more than 169,36 Ha, while  land area is just only 0,6 Ha and  0,5 – 2 meter depth. Water quality include temperature distribution about 29,8 – 30,4 oC, dissolved oxygen 6,001 – 7,110 mg/L, salinity 32,891 – 33,214 PSU, turbidity 0,518 – 1,944 FTU,chlorophyll 0,204 – 0,563 ug/L and pH about 8,505 -8,592 and its quality relative normal. Current velocity about 0,102 – 0,407 m/s at the reef flat, this conditions is relative height all along monsoon until corall reff many a massive type, at the some location have good corall conditon. Karang Congkak Island has potency for tourism maritime. Determining of sea protection at Karang Congkak island is very useful to preserve remainder corall reef existence. Keywords : reef flat, waters quality, preserve area
Asupan gizi dan status gizi sebagai faktor risiko hipertensi esensial pada lansia di Puskesmas Curup dan Perumnas Kabupaten Rejang Lebong Propinsi Bengkulu Riyadi, Agung; Wiyono, P; Budiningsari, R Dwi
Jurnal Gizi Klinik Indonesia Vol 4, No 1 (2007): Juli
Publisher : Minat S2 Gizi dan Kesehatan, Prodi S2 IKM, FK-KMK UGM

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4483.101 KB) | DOI: 10.22146/ijcn.17464

Abstract

Background: Hypertension is happened generally at someone who has age more than 40 year. The prevalence of hypertension was tend to increase along with the increasing of amount of the elderly. Changing of nutrition status and unfavorable nutrition intakes like is high fat, sodium and low micronutrients (potassium, calcium, magnesium) have an effect to incidence of essential hypertension. Retreating of biologic accompanying aging process sometimes make the elderly become resistance to get quality of intakes nutrition.Objective: The study was conducted to know relations between nutrition intakes and nutrition status with occurrence on essential hypertension of the elderly in the health center Curup and Perumnas, Rejang Lebong District.Method: The study was observational analytic with case control matched study. Subject of the study was divided into two group i.e. case and control with comparison case and control 1:1 which matched to age and sex. Total subject were 150, taken by simple random method. The cases were essential hypertension patients who had recently diagnosed by doctors. Blood pressure measurements were three times in supine position. Hypertension was defined as average of three times supine systolic/diastolic blood pressures at p >140/ 90 mmHg. Nutrition status was determined by Body Mass Index (BMI). Intake nutrients were collected using Food Frequency Questionnaire (FFQ) in the last 3 months by using food model. χ 2 McNemar were used to bivariate analytic and condition logistic regression to identify risk factors associated with essential hypertension.Result: This study showed that there were 4 variables significantly related with essential hypertension, i.e. intakes of sodium (OR: 3.43; CI 95%:1.09-10.77), potassium (OR: 0.24; CI 95%:0.07-0.84), stress (OR: 3.79; CI 95%:1.18-12.12), and obesity (OR: 4.57; CI 95%:1.49-13.95). The no significant correlation (p>0.05) identified for intakes of fat, calcium, magnesium, coffee consumption, smoking status and family history of essential hypertension.Conclusion: High intake of sodium, stress and obesity were the risk factors on occurrence of essential hypertension. In the other hand, high intake of potassium were reduce the risk on occurrence of essential hypertension (protective factor) in the health center Curup and Perumnas, Rejang Lebong District.
KARAKTERISTIK AIR TANAH DI KECAMATAN TAMANSARI KOTA TASIKMALAYA Riyadi, Agung
Jurnal Teknologi Lingkungan Vol. 8 No. 3 (2007): JURNAL TEKNOLOGI LINGKUNGAN
Publisher : Center for Environmental Technology - Agency for Assessment and Application of Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/jtl.v8i3.425

Abstract

Pumping test are carried out to determine how much groundwater taken from a well and what effects pumping will have on the aquifer. Theis recovery method aims to find out the aquifer characteristics such as transmisibility and permeability values. This method in principle observes the recovery of ground water surface until stable. This research location at Tamansari distric Tasikmalaya West Java. The value of transmisibilitas and permeabilitas in Tamansari district indicated the groundwater potency is not good for industry ot comercial water. Higher value at Sukahurip and lowest value at Bantarhuni with a permeability coeficient only 1.32 m2/day. Ground water flow (m3/day) between 410 – 4868 m3/day at Mugarsari. Ground water resources is limited potency, especially at dry season, local goverment need to conserv with a build pond or fishpond for reserve water.
Status Kandungan Logam Berat Perairan Pesisir Kabupaten Aceh Utara dan Kota Lhokseumawe Komarawidjaja, Wage; Riyadi, Agung; Garno, Yudhi Soetrisno
Jurnal Teknologi Lingkungan Vol. 18 No. 2 (2017)
Publisher : Center for Environmental Technology - Agency for Assessment and Application of Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (665.059 KB) | DOI: 10.29122/jtl.v18i2.2040

Abstract

Kawasan pesisir Kota Lhokseumawe-Kabupaten Aceh Utara merupakan salah satu pusat pertumbuhan ekonomi di Provinsi Daerah Khusus Aceh, yang telah ditetapkan menjadi kawasan ekonomi khusus (KEK), dan didalamnya akan beroperasi industri-industri baru. Dengan beroperasinya industri-industritersebut maka dimasa yang akan datang perairan pesisir Lhoksemawe-Aceh akan menjadi tujuan akhir dari berbagai limbah dari industri di KEK Lhokseumawe yang diantaranya mengandung logam berat. Dalam rangka mengetahui peningkatan konsentrasi logam berat dimasa mendatang diperlukan informasi kadungan logam berat saat ini. Untuk itulah maka penelitian ini dilakukan dengan tujuan untuk mengetahui konsentrasi logam berat, seperti Air raksa (Hg), Cadmium (Cd), Tembaga (Cu), Timbal (Pb) dan Seng (Zn). Penelitian ini mengungkapkan bahwa selain Timbal (Pb), konsentrasi logam berat yang diteliti di perairan Louksemawe-Aceh Utara masih berada dibawah ambang batas baku mutu yang berlaku di wilayah Indonesia. Berkenaan dengan kualitas perairan yang cenderung memburuk tersebut, maka pengolahan limbah di setiap industri yang beroperasi di dalam KEK Lhokseumawe perlu dilakukandengan baik.  Kata kunci : Kawasan Pesisir, Kawasan Ekonomi Khusus, Perairan pesisir, logam berat
KUALITAS LINGKUNGAN PERAIRAN DAN KONDISI OSEANOGRAFI DI KAWASAN INDUSTRI SEKUPANG KOTA BATAM = Water Environment Quality and Oceanographic Conditions in the Industrial Area Sekupang, Batam Riyadi, Agung; Santos, Matih
Jurnal Teknologi Lingkungan Vol. 14 No. 1 (2013)
Publisher : Center for Environmental Technology - Agency for Assessment and Application of Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29122/jtl.v14i1.1435

Abstract

This study is located in industrial area in Sekupang, Batam. Primary data collection includes water quality, aquatic biota, and the tidal current direction and speed measurement. Overall water quality conditions in the surrounding industrial area Sekupang is still good, it can be seen from the results of laboratory analysis is still below the quality standards specified . Flow pattern at high tide is moving south at a speed of 1 m / sec, while at low tide movement heading north flows with varying speeds ranging from 0.1 m / sec to 1 m / sec. Tidal patterns according to formulation Formzahl 0.48, which means there is a double mix of ups and downs in a day where there will be two times of ups and downs twice but different amplitudes, and riding pasutnya up to 2.93 m. Phytoplankton in the study area found 25 species such as Skeletonema sp., Chaetoceros sp, sp Lauderia which dominate the waters. There is also a kind of Dynophyceae with species such as Peridinium sp, whereas Cyanophyceae types are Trichodesmium sp. Results of analysis diversitasnya index of 1.54, which identifies those waters have poor quality. Evenness index/species uniformity of 0.43 indicates the quality of its waters being. While the dominance index was the quality of the water has a value of 0.41. Mike21 hydrodynamic modeling is used in assisting the analysis of the direction and speed of global flows in accordance with the pattern of tidal and bathymetric depth.Keyword: patterns of currents, tides, environmental quality, model Abstrak Penelitian ini berlokasi di kawasan industri Sekupang Kota Batam. Pengambilan data primer meliputi kualitas air, biota perairan, pasang surut dan pengukuran arah dan kecepatan arus. Secara keseluruhan kondisi kualitas perairan di sekitar kawasan industri Sekupang masih baik, hal ini dapat dilihat dari hasil analisa laboratorium masih di bawah baku mutu yang ditetapkan. Pola arus pada saat pasang bergerak ke arah selatan dengan kecepatan 1 m/detik, sedangkan pada saat surut pergerakan arus mengarah ke utara dengan kecepatan bervariasi berkisar 0,1 m/detik hingga 1m/detik. Pola pasang surut menurut formulasi Formzahl 0,48 yang artinya terdapat pasang surut campuran ganda dimana dalam satu hari akan terjadi dua kali pasang dan dua kali surut akan tetapi amplitudo berbeda-beda, dan tunggang pasutnya hingga 2,93 m. Fitoplankton di wilayah penelitian dijumpai 25 spesies seperti Skeletonema sp., Chaetoceros sp, Lauderia sp yang mendominasi perairan. Juga terdapat jenis Dynophyceae dengan spesies seperti Peridinium sp, sedangkan jenis Cyanophyceae terdapat Trichodesmium sp. Hasil analisa indeks diversitasnya 1,54 yang mengidentifikasikan perairan tersebut mempunyai kualitas buruk. Indeks kemerataan/keseragaman spesies 0,43 yang mengindikasikan kualitas perairannya sedang. Sedangkan indeks dominansi perairan mempunyai kualitas sedang dengan nilai 0,41. Pembuatan model hidrodinamika menggunaan Mike21 di dalam membantu analisis arah dan kecepatan arus secara global sesuai dengan pola pasang surut dan kedalaman batimetri. Kata kunci: pola arus, pasang surut, kualitas lingkungan, model