Civil and Environmental Science Journal (CIVENSE - Fakultas Teknik Universitas Brawijaya)
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Determination of Pollution Load Capacity Using QUAL2Kw Program on The Musi River Palembang
Get PDFThe Object of this research is a river named Musi, located in Palembang City, South of Sumatera, which is one of the longest and the biggest river in Indonesia. The condition of water quality in this river must be concerned because the high demand is not balanced with a good water quality. So, the aim of this study is to determine the value of the pollution load capacity, which is useful for consideration to government on water quality improvement policy. QUAL2Kw is used as an application to calculate the pollution capacity which entered to each river segment. There are 3 scenarios in this study, simulation 1 is calibrated model, simulation 2 is maximum of pollutant load condition, and simulation 3 is minimum of pollutant load condition. The value of pollutant load capacity is obtained from the difference between simulation 2 and simulation 3. The results show that the pollution load capacity on Musi River (particularly segment Pulokerto - PT. Baja Baru) in 2016 sequentially 12948 kgDO/day, 25205 kgBOD5/day, 3207 kg/ NH3-N day, 642 kg PO4/da
Calibration of surface runoff parameters with the hydrologic tank model using recursive digital filter and master recession curve
Get PDFThere are two basic methods to calibrate the hydrological model: (1) the trial and error procedure; (2) the automatic calibration. The problem in the calibration method is the determination of the initial value of the parameters. This poses a problem for beginner model users. This paper presents the calibration results of surface runoff parameters in the hydrological tank model using recursive digital filter method and the master recession curve. The results indicate that the Recursive Digital Filter as a surface runoff separation method can be used for the initial approach to calibrate the tank model parameter
Study of economic impact of terminals type A and weigh stations management handover in East Java province to the central government
Get PDFPurpose of this study is to know the operational performance of terminals type A and weigh stations in East Java Province, analyse the economic contribution to the regional government, assessing the operational impact terminals type A and weigh, and examine the strategy of minimizing the operational impact if terminals are taken over by the central government. Analysis used in this study are growth analysis, efficiency analysis, ImportancePerformance Analysis (IPA) method, and Strength Weakness Opportunity Threat method. The operational economic performance of Terminals Type A (Arjosari Terminal), obtained retribution of 2,346,495,500 IDR and Bayuangga Terminal obtained retribution of 1,796,877,000 IDR. The operational economic performance of weigh stations is 35,668,880,000 IDR. The operational economic contribution of Terminals Type A and weigh stations is very small/less. The operational impact of Terminals Type A that taken over by the Central Government for the next 15 years is still considered good. Strategy to minimize the operational impact of Terminals Type A with: 1. Strategy S-O (Strength-Opportunity), 2. Strategy S-T (Strength-Threat), 3. Strategy W-O (Weak-Opportunity), 4. Strategy W-T (Weak-Threat). For weigh stations we cannot do IPA and SWOT analysis because all samples of weigh bridges are no longer operating when this study is conducted
Hydraulic Performance of Concrete Block Pavement under High Rainfall Intensities
Get PDFHigh rainfall intensity will generate different response on the concrete block pavement (CBP) performance. A study found that larger openings of CBP did not lead more water penetrated. In other study, larger openings can lead greater decrease in runoff velocity. The correlation between the openings, water penetration and runoff velocity has remained unclear. In this study, we investigated hydraulic performance of CBP as an impact of surface roughness condition, under high rainfall intensities, saturated sub-base layer, and various slope surfaces. We conducted experiment using a 2 m by 6 m of rectangular CBP layer with herringbone 90 and basket-weave pattern. We used a modified dye tracing method in view to monitor the surface flow velocity under various high rainfall intensities. The results showed that hydraulic performance of surface runoff in the CBP layer was more influenced by the surface roughness condition. The roughness condition was very sensitive to the change in surface configuration of the CBP. The relationship between rainfall intensity, surface slope and roughness number followed polynomial functions. A further study is required to investigate the appropriate quality of CBPs, which have high durability applied over a steep slope surface and under high rainfall intensities
Determining Infiltration Rate from Infiltration Measurement with Flooding Method by Turftech Infiltrometer
Get PDFThe density of the soil in this study estimate parameters with a dry bulk density. variation of soil density based on urban land us and then grouped into heavy, medium, and high-density soil. the rate of infiltration testing is performed by using turftech infiltrometer. and then analyzed with an infiltation horton modification models. the specification of turftech double ring infiltrometer are 6.03 cm for inner ring diameter and 10.79 cm for outer ring diameter. the result of infiltration rate observations is infiltration rate for higher density soil and land slope had low influences. the results showed that the turftech ifiltrometer that is used produced well results with 87% accuracy compared with the horton equation infiltration rate model. for the measurement results feasibility, then the turftech infiltrometer unable to represent for the land slope and density, because from the regression test the relationship between land slope and density toward infiltration rate was not significant and obtained average of 38% from the obtained r2
The Application of Modal Split Using Revealed and Stated Preference Techniques: A study in Malang
Get PDFIn this study we investigate modal split and travel behaviour in Malang by conducting person trip survey in study area. The purpose is to understand respondent\u27s travel behaviour and their preferences in selecting mode of transport. This is carried out to understand what are respondents feel regarding their perception on mode of transportation that available to them. The data being used are Revealed Preference (RP) and Stated Preference (SP) data. The first data based on present situation of respondents (including respondent\u27s characteristics and daily travel information), while the second one is hypothetical scenario that has not available in present condition. These data then compared and analysed using Multinomial Logit Model (MNL)
Analysis of Drainage Capacity and Rehabilitation Subjected to Rainfall and Reverse Flow of Marengan River as a Main Drain in Sumenep City, Indonesia
Get PDFLand use changing in Sumenep city in recent years has caused runoff in several locations. Therefore, rehabilitations of existing channel to suit the surface runoff are needed. This paper presents capacity determination of existing drainage channels subjected to rainfall with 5-year flood discharge plan and consideration of sea tides effect to Marengan River which crossed Sumenep city. The proposed flood control methods in Sumenep city area was also discussed. The catchment of specified rural area was modelled using SWMM instrument to compare channel conditions before and after rehabilitation. Channel size and height of water level in channel due to rainfall together with the effect of backwater occurred in Marengan River caused by the sea tides was observed during the time. From the analysis, it was found that most of existing secondary drainage channels are uncapable to accommodate rainfall with 5-year flood discharge plan. From the available eight secondary drainage channels outlets, the last three outlets were subjected to reverse flows effect in Marengan River due to sea tides. In order to reduce the occurance of surface runoff inundation, secondary drainage channel rehabilitation was planned at each outlet, and these proven capable to accommodate rainwater runoff and reverse flow as wel
Urban Growth Modelling of Malang City using Artificial Neural Network Based on Multi-temporal Remote Sensing
Get PDFIn this study, the prediction of urban growth was simulated by Artificial Neural Network (ANN) model using MOLUSCE, plugin of QGIS. Objectives of this study is to illustrate the urban growth in Malang City over time span of 24 years and also to predict the future of urban growth using ANN model for the year 2027. Land cover maps were extracted for 2003, 2009 and 2015 via remote sensing images from Landsat ETM+ and OLI, respectively. The overall classification accuracy and kappa coefficient for all classified maps were over 85% and 0.76, respectively. According to the simulation result, 1049.58 ha of vegetation and 241.29 ha of bare land in 2015 would experience a transition to built-up areas in 2027. Then, the built-up areas would experience an increase by 11.79% from 2015 to 2027. In 2027, the built up areas would covered the city by 73.21% of the city area. There was a trend in increasing of built-up areas during the period 2003 to 2027. Overall, the result shows that urban growth models by using ANN model can be a considerable option for future changes according to past and current factors
North Jamrud Terminal Warehouse Performance by The Effect of Halal Logistics Issue
Get PDFThe Government today, Government Business Entity and mass media in Indonesia are starting to pay attention to halal, since the turnover of halal products of the world has reached nearly 2 trillion dollars while Indonesia is still larger to be a consumer than a manufacturer. Not only foods, consumers in the world today want cosmetics to pharmaceutical products that have been halal certified. In Indonesia, problems with the potential of halal market today are still hit on the discourses. Indonesia still limited awareness not yet dared to action, whereas in nonMuslim countries themselves many have implemented halal supply chain. The establishment of Halal Hub Port in Tanjung Priok as the first Halal Hub Port pilot project in Indonesia is the forerunner to establish Halal Hub Port in other parts of Indonesia. Therefore, it is necessary to examine the needs of Halal Warehouse at Tanjung Perak Port which in fact is also a major port in Indonesia and is a distribution door for the central and eastern part of Indonesia. The study was conducted on 190 respondents who are stakeholders of Tanjung Perak Port. Using the Importance Performance Analysis method, the results of the research produced a quadrant graph where quadrant A is the main priority containing performance of L/U equipment in terminal, performance of L/U workers/operator in terminal, separation of halal and non-halal products in halal warehouse, sorting of halal and non-halal products that have been damaged, cold storage separation between halal and non-halal products, clean and avoid contamination between products, special training for officers in halal warehouse, and hygiene facilities for officers in warehouse/halal warehouse. Quadrant B is to maintain the achievement contains 11 items, Quadrant C is low priority contains 5 items, and Quadrant D is excessive contains 5 items. The existence of 8 items entered in quadrant A, indicating that stakeholders at Tanjung Perak Port are very aware with the potential of Halal Warehouse
Application of Polynomial Rocking Bearings as Seismic Isolation System on Irregular Bridges
Get PDFFriction Pendulum System (FPS) is one of the conventional sliding isolators which widely used and effectively proved to reduce seismic hazard in far-fault earthquakes. However, it may not be effective when the structures are induced by near-fault earthquakes because the earthquake\u27s period is usually close to the isolation period. In this study, a Polynomial Rocking Bearing (PRB) which has variable isolation stiffness is used to improve the performance of seismic isolation systems applied on irregular bridges under near-fault earthquakes. The PRB is composed by an articular joint and concave rocking surface. The rocking surface is defined by a sixth-order polynomial function. Based on previous studies, the PRB has been verified to effectively suppress the large isolator displacement subjected to near-fault earthquakes on building and regular bridges. However, it has not been used yet in the irregular bridges. This study aims to analyze the behaviour of Polynomial Rocking Bearing installed on an irregular bridge. As compared with Friction Pendulum Systems (FPS), the performance of PRBs is much better to effectively suppress the displacement of the bridge deck in both near and far-fault earthquakes