E. M. Simanjuntak, Juventus Welly Radianta Ginting, Idam Putra
Volcanic activity of Mount Anak Krakatau has been increased in the recent years. One of the consequences was Tsunami Sunda Strait in 2018. This heightened the awareness of the potential impact of a tsunami induced by Anak Krakatau for the construction of NCICD Project. This research is aimed to calculate the potential impact in the terms of wave force. Tsunami Krakatau 1883 was used as reference for two reasons. First, the comprehensive research has been conducted for this event. Second, the magnitude of Mount Anak Krakatau-induced tsunami will not be higher than that of Tsunami Krakatau 1883. Non shallow water equation-based numerical model is applied to simulate the tsunami. Time series from the model result is extracted as an input to calculate the wave force. There are four different method used such as Rule of Thumb, Linear Theory, Sainflou Method and Goda Method. The results show that the tsunami will hit the outer sea dike with a minimal force of 100 kN and a maximum force of 400 kN. OSD1-A is the safest sea dike since the tsunami only will hit the structure with a half force.
{"title":"WAVE FORCE OF TSUNAMI KRAKATAU 1883 ON THE OUTER SEA DIKE IN JAKARTA BAY","authors":"E. M. Simanjuntak, Juventus Welly Radianta Ginting, Idam Putra","doi":"10.32679/jth.v11i2.639","DOIUrl":"https://doi.org/10.32679/jth.v11i2.639","url":null,"abstract":"Volcanic activity of Mount Anak Krakatau has been increased in the recent years. One of the consequences was Tsunami Sunda Strait in 2018. This heightened the awareness of the potential impact of a tsunami induced by Anak Krakatau for the construction of NCICD Project. This research is aimed to calculate the potential impact in the terms of wave force. Tsunami Krakatau 1883 was used as reference for two reasons. First, the comprehensive research has been conducted for this event. Second, the magnitude of Mount Anak Krakatau-induced tsunami will not be higher than that of Tsunami Krakatau 1883. Non shallow water equation-based numerical model is applied to simulate the tsunami. Time series from the model result is extracted as an input to calculate the wave force. There are four different method used such as Rule of Thumb, Linear Theory, Sainflou Method and Goda Method. The results show that the tsunami will hit the outer sea dike with a minimal force of 100 kN and a maximum force of 400 kN. OSD1-A is the safest sea dike since the tsunami only will hit the structure with a half force.","PeriodicalId":356205,"journal":{"name":"JURNAL TEKNIK HIDRAULIK","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125700247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Development of floating breakwater are increasing along with the rising interest of floating infrastructure. One of the applications is floating breakwater using concrete pontoon. Large and rigid structure are possible to construct with the usage of concrete. However, it still limited with the available construction and transportation method to handle such a large structure. Double configurations of floating breakwater proposed to increase the structure’s performance with the size limitation. The breakwater performance tested with physical model in laboratory by comparing performance of single pontoon with double pontoon for various structure spacing. Pontoon size are 1.2 m in length, 0.3 m in width, and 0.15 m in height and tested with many combination of irregular waves and for double configurations model, the spacing of 30 cm, 60 cm, and 90 cm are used. The structure works optimal in low range harmonic period. Performance of single configuration are in the range of Kt 0.6 up to 0.97, transmission increased along with the waves period. The Kt value of double configuration are around 0.45 up to 0.8. Performance of double configuration determined by ratio of structure spacing with wavelength. Larger ratio resulted a better performance in condition where the spacing did not exceed 0.65 length of wavelength.
{"title":"PERFORMANCE OF CONCRETE PONTOON FLOATING BREAKWATER WITH DOUBLE CONFIGURATION","authors":"Irham Adrie Hakiki, L. Sembiring","doi":"10.32679/jth.v11i2.629","DOIUrl":"https://doi.org/10.32679/jth.v11i2.629","url":null,"abstract":"Development of floating breakwater are increasing along with the rising interest of floating infrastructure. One of the applications is floating breakwater using concrete pontoon. Large and rigid structure are possible to construct with the usage of concrete. However, it still limited with the available construction and transportation method to handle such a large structure. Double configurations of floating breakwater proposed to increase the structure’s performance with the size limitation. The breakwater performance tested with physical model in laboratory by comparing performance of single pontoon with double pontoon for various structure spacing. Pontoon size are 1.2 m in length, 0.3 m in width, and 0.15 m in height and tested with many combination of irregular waves and for double configurations model, the spacing of 30 cm, 60 cm, and 90 cm are used. The structure works optimal in low range harmonic period. Performance of single configuration are in the range of Kt 0.6 up to 0.97, transmission increased along with the waves period. The Kt value of double configuration are around 0.45 up to 0.8. Performance of double configuration determined by ratio of structure spacing with wavelength. Larger ratio resulted a better performance in condition where the spacing did not exceed 0.65 length of wavelength.","PeriodicalId":356205,"journal":{"name":"JURNAL TEKNIK HIDRAULIK","volume":"354 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122798848","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ABSTRAKPenilaian risiko bendungan pada dasarnya merupakan suplemen atau tambahan dari pendekatan berbasis standar (standard based approach) yaitu pendekatan tradisional untuk rekayasa teknik bendungan. Untuk bendungan-bendungan yang sudah ada baik yang baru maupun yang lama, penilaian risiko bendungan bertujuan untuk mengetahui apakah risiko bahaya yang ada dapat ditoleransi, dan apabila risiko bahaya tidak dapat ditoleransi maka perlu direncanakan tindakan-tindakan untuk mengurangi risiko. Penilaian risiko untuk bendungan-bendungan yang sudah ada juga dapat dijadikan dasar untuk menentukan prioritas dalam melakukan pekerjaan perbaikan atau rehabilitasi yang diperlukan. Dalam makalah ini dibahas mengenai penilaian risiko keamanan bendungan pada Bendungan Sengguruh, Sutami, Lahor, Wlingi, Bening, Wonorejo dan Selorejo. Metode yang dilakukan dalam penilaian risiko meliputi penyusunan penilaian risiko, analisis risiko, evaluasi risiko, pengurangan dan manajemen risiko. Berdasarkan hasil penilaian, 7 bendungan tersebut memenuhi kriteria risiko. Tindakan selanjutnya yang dapat dilakukan untuk bendungan-bendungan tersebut adalah melakukan pemantauan perilaku bendungan secara rutin dan pada kondisi setelah gempa, memperbaharui dan mensosialisasikan RTD.Kata kunci: penilaian risiko, analisis risiko, evaluasi risiko, manajemen risiko, bendungan
{"title":"PENILAIAN RISIKO KEAMANAN BENDUNGAN DI JAWA TIMUR","authors":"Maria Asunta Hana Pramudawati","doi":"10.32679/jth.v11i2.631","DOIUrl":"https://doi.org/10.32679/jth.v11i2.631","url":null,"abstract":"ABSTRAKPenilaian risiko bendungan pada dasarnya merupakan suplemen atau tambahan dari pendekatan berbasis standar (standard based approach) yaitu pendekatan tradisional untuk rekayasa teknik bendungan. Untuk bendungan-bendungan yang sudah ada baik yang baru maupun yang lama, penilaian risiko bendungan bertujuan untuk mengetahui apakah risiko bahaya yang ada dapat ditoleransi, dan apabila risiko bahaya tidak dapat ditoleransi maka perlu direncanakan tindakan-tindakan untuk mengurangi risiko. Penilaian risiko untuk bendungan-bendungan yang sudah ada juga dapat dijadikan dasar untuk menentukan prioritas dalam melakukan pekerjaan perbaikan atau rehabilitasi yang diperlukan. Dalam makalah ini dibahas mengenai penilaian risiko keamanan bendungan pada Bendungan Sengguruh, Sutami, Lahor, Wlingi, Bening, Wonorejo dan Selorejo. Metode yang dilakukan dalam penilaian risiko meliputi penyusunan penilaian risiko, analisis risiko, evaluasi risiko, pengurangan dan manajemen risiko. Berdasarkan hasil penilaian, 7 bendungan tersebut memenuhi kriteria risiko. Tindakan selanjutnya yang dapat dilakukan untuk bendungan-bendungan tersebut adalah melakukan pemantauan perilaku bendungan secara rutin dan pada kondisi setelah gempa, memperbaharui dan mensosialisasikan RTD.Kata kunci: penilaian risiko, analisis risiko, evaluasi risiko, manajemen risiko, bendungan","PeriodicalId":356205,"journal":{"name":"JURNAL TEKNIK HIDRAULIK","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117204340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rian Mohammad Azhar, A. Larasari, Semeidi Husrin, Huda Bachtiar
Main issues frequently faced by communities living in the city of Jakarta is salt water intrusion. This paper analyzes the extent of the distribution of saltwater contamination to coastal aquifers in Jakarta, the method used is the open source program FREEWAT. modeling is carried out in five scenarios, namely (1) reduction of 50% of groundwater use, (2) reduction of 25% of groundwater use, (3) existing groundwater use in 2012, (4) increase of 25% of groundwater use, and (5) increase of 50% of groundwater use. From the modeling results, the distribution of saltwater contamination on each layer of the aquifer of Jakarta. In unconfined aquifer the existing condition is scenario 3 intrusion as far as 1.604 m, on scenario 1 there is an intrusion decrease of 38%, in scenario 2 there is an intrusion decrease of 13%, in scenario 4 there is an increase in intrusion by 17% and on scenario 5 increase intrusion by 25%. In upper confined aquifer, the existing condition, namely scenario 3, has occurred as much as 1.809 m intrusion, in scenario 1 there is an intrusion decrease of 23%, in scenario 2 there is an intrusion decrease of 8%, in scenario 4 there is an increase in intrusion by 19% and in scenario 5 increase intrusion by 26%. In middle confined aquifer, the existing condition is scenario 3, 1.927 m intrusion occurs, on the scenario 1 there is an intrusion decrease of 23%, in scenario 2 there is an intrusion decrease of 9%, in scenario 4 there is an increase in intrusion by 16% and in the scenario 5 increase intrusion by 22%.
{"title":"Respon Hidraulik Dan Stabilitas Lapis Armor Pada Desain Awal Tanggul Laut Lepas Pantai NCICD","authors":"Rian Mohammad Azhar, A. Larasari, Semeidi Husrin, Huda Bachtiar","doi":"10.32679/JTH.V10I1.603","DOIUrl":"https://doi.org/10.32679/JTH.V10I1.603","url":null,"abstract":"Main issues frequently faced by communities living in the city of Jakarta is salt water intrusion. This paper analyzes the extent of the distribution of saltwater contamination to coastal aquifers in Jakarta, the method used is the open source program FREEWAT. modeling is carried out in five scenarios, namely (1) reduction of 50% of groundwater use, (2) reduction of 25% of groundwater use, (3) existing groundwater use in 2012, (4) increase of 25% of groundwater use, and (5) increase of 50% of groundwater use. From the modeling results, the distribution of saltwater contamination on each layer of the aquifer of Jakarta. In unconfined aquifer the existing condition is scenario 3 intrusion as far as 1.604 m, on scenario 1 there is an intrusion decrease of 38%, in scenario 2 there is an intrusion decrease of 13%, in scenario 4 there is an increase in intrusion by 17% and on scenario 5 increase intrusion by 25%. In upper confined aquifer, the existing condition, namely scenario 3, has occurred as much as 1.809 m intrusion, in scenario 1 there is an intrusion decrease of 23%, in scenario 2 there is an intrusion decrease of 8%, in scenario 4 there is an increase in intrusion by 19% and in scenario 5 increase intrusion by 26%. In middle confined aquifer, the existing condition is scenario 3, 1.927 m intrusion occurs, on the scenario 1 there is an intrusion decrease of 23%, in scenario 2 there is an intrusion decrease of 9%, in scenario 4 there is an increase in intrusion by 16% and in the scenario 5 increase intrusion by 22%.","PeriodicalId":356205,"journal":{"name":"JURNAL TEKNIK HIDRAULIK","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134110523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Peatland fires encourage the government to restore peat function as natural water storage. One of the measures taken is to build a circumference dike to hold water to reduce excessive drainage. However, there is no study yet of the planned average water level that has to be maintained from the construction of circumference dike. Therefore, the aim of this study is to calculate the average water level on peatlands inside the circumference dike. The methods used consist of hydrological analysis, spatial analysis, and water level analysis. The results of the analysis shows that the average water level in normal years tends to be above the surface, except in the second half of August to the first half of November. In the second half of September to the second half of October, the peat has the potential to be burned. In a dry season the water tends to fall decline to the drainage boundary of peatland which is at -1.5 m which occurs in the second half of March to December. In the second half of February until December peatland has potential to be burned. From this research, it can be concluded that the calculations using this method is similar with in-situ observation data and can be used to calculate the average water level of peat with the same conditions in other locations.
{"title":"Analisa Perhitungan Muka Air Rata-Rata Di Lahan Gambut Dengan Tanggul Keliling Dalam Rangka Mengurangi Kebakaran","authors":"Indra setya Putra, Yudi Lasmana","doi":"10.32679/JTH.V10I1.601","DOIUrl":"https://doi.org/10.32679/JTH.V10I1.601","url":null,"abstract":"Peatland fires encourage the government to restore peat function as natural water storage. One of the measures taken is to build a circumference dike to hold water to reduce excessive drainage. However, there is no study yet of the planned average water level that has to be maintained from the construction of circumference dike. Therefore, the aim of this study is to calculate the average water level on peatlands inside the circumference dike. The methods used consist of hydrological analysis, spatial analysis, and water level analysis. The results of the analysis shows that the average water level in normal years tends to be above the surface, except in the second half of August to the first half of November. In the second half of September to the second half of October, the peat has the potential to be burned. In a dry season the water tends to fall decline to the drainage boundary of peatland which is at -1.5 m which occurs in the second half of March to December. In the second half of February until December peatland has potential to be burned. From this research, it can be concluded that the calculations using this method is similar with in-situ observation data and can be used to calculate the average water level of peat with the same conditions in other locations.","PeriodicalId":356205,"journal":{"name":"JURNAL TEKNIK HIDRAULIK","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116601207","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
E. M. Simanjuntak, Leo Eliasta, Juventus Welly Radianta Ginting, Idam Putra
Pile breakwater is an alternative coastal structure to prevent coastal erosion considering the economic and technical aspect. An improved design for pile breakwater is proposed here. Our goal is to develop an assessment tool in planning the implementation of pile breakwater. This tool is based on numerical model that has been verified with physical model result. The wave spectrum show that the numerical model is able to simulate the wave as same as the physical model with overestimation. It also points out that the simulation with wave period (T) = 2.5 s has more significant noise than the simulation with wave period (T) = 2 s. In general, the numerical model has high accuracy for predicting incident wave height (Hi), transmitted wave height (Ht) and transmission coefficient (KT) with error below 1 % RMSE. Xbeach is also able to simulate pile breakwater with high accuracy especially for two or three row arrangement with width gap 0.3 m. Even so, the numerical model have limitation regarding wave phase and wave through irregularity. Pile breakwater is an alternative coastal structure to prevent coastal erosion considering the economic and technical aspect. An improved design for pile breakwater is proposed here. Our goal is to develop an assessment tool in planning the implementation of pile breakwater. This tool is based on numerical model that has been verified with physical model result. The wave spectrum show that the numerical model is able to simulate the wave as same as the physical model with overestimation. It also points out that the simulation with wave period (T) = 2.5 s has more significant noise than the simulation with wave period (T) = 2 s. In general, the numerical model has high accuracy for predicting incident wave height (Hi), transmitted wave height (Ht) and transmission coefficient (KT) with error below 1 % RMSE. Xbeach is also able to simulate pile breakwater with high accuracy especially for two or three row arrangement with width gap 0.3 m. Even so, the numerical model have limitation regarding wave phase and wave through irregularity.
{"title":"Modelling Wave Dissipation on Pile Breakwater Using Xbeach","authors":"E. M. Simanjuntak, Leo Eliasta, Juventus Welly Radianta Ginting, Idam Putra","doi":"10.32679/JTH.V10I1.605","DOIUrl":"https://doi.org/10.32679/JTH.V10I1.605","url":null,"abstract":"Pile breakwater is an alternative coastal structure to prevent coastal erosion considering the economic and technical aspect. An improved design for pile breakwater is proposed here. Our goal is to develop an assessment tool in planning the implementation of pile breakwater. This tool is based on numerical model that has been verified with physical model result. The wave spectrum show that the numerical model is able to simulate the wave as same as the physical model with overestimation. It also points out that the simulation with wave period (T) = 2.5 s has more significant noise than the simulation with wave period (T) = 2 s. In general, the numerical model has high accuracy for predicting incident wave height (Hi), transmitted wave height (Ht) and transmission coefficient (KT) with error below 1 % RMSE. Xbeach is also able to simulate pile breakwater with high accuracy especially for two or three row arrangement with width gap 0.3 m. Even so, the numerical model have limitation regarding wave phase and wave through irregularity. Pile breakwater is an alternative coastal structure to prevent coastal erosion considering the economic and technical aspect. An improved design for pile breakwater is proposed here. Our goal is to develop an assessment tool in planning the implementation of pile breakwater. This tool is based on numerical model that has been verified with physical model result. The wave spectrum show that the numerical model is able to simulate the wave as same as the physical model with overestimation. It also points out that the simulation with wave period (T) = 2.5 s has more significant noise than the simulation with wave period (T) = 2 s. In general, the numerical model has high accuracy for predicting incident wave height (Hi), transmitted wave height (Ht) and transmission coefficient (KT) with error below 1 % RMSE. Xbeach is also able to simulate pile breakwater with high accuracy especially for two or three row arrangement with width gap 0.3 m. Even so, the numerical model have limitation regarding wave phase and wave through irregularity. ","PeriodicalId":356205,"journal":{"name":"JURNAL TEKNIK HIDRAULIK","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121447185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. Ginting, Ida Ayu Irawati Diah Ratna Putra, E. Simanjuntak
Breakwaters is one of type coastal structure that is mainly used as part for coastal protection purposes. Among the various types of breakwaters, likely rigid and hollow vertical pole types are one of the alternative structures for coastal protection. The utilization of this structure usually in the port area or in marina which protrudes into the sea. The pile breakwater test was carried out at laboratory experimental station for coastal engineering Buleleng Bali, on a scale of 1:10. This trial was carried out using pile materials using PVC pipes with a diameter of 6 cm. Scaling of this model is based on the piles used in the project sea dike stage A-NCICD. In testing this physical model several variations were carried out such as tata letak variation (N), wave height (h), wave period (t), distance between piles (columns) relative to diameter (B/D), and distance between piles (row) relative to diameter (b / D). Based on the test results obtained the optimal stacking configuration to reduce wave energy is a configuration with pole configuration B / D = 1; b / D = 0.5
防波堤是一种主要用作海岸防护的海岸结构型式。在各种类型的防波堤中，刚性和空心立杆型防波堤是海岸防护的备选结构之一。这种结构的使用通常在港区或突出海面的码头。桩基防波堤试验在巴厘海岸工程实验室试验站进行，比例尺为1:10。本试验采用直径为6 cm的PVC管材进行堆料。该模型的尺度是基于工程海堤A-NCICD阶段所使用的桩。在对该物理模型进行测试时，采用了塔跃差(N)、波高(h)、波周期(t)、桩(柱)距相对直径(B/D)、桩(排)距相对直径(B/D)等多种变量，根据测试结果得出降低波能的最优堆垛配置为极点配置B/D = 1;b / D = 0.5
{"title":"Model Fisik Redaman Energi Gelombang Dengan Breakwater Tiang","authors":"J. Ginting, Ida Ayu Irawati Diah Ratna Putra, E. Simanjuntak","doi":"10.32679/JTH.V10I1.606","DOIUrl":"https://doi.org/10.32679/JTH.V10I1.606","url":null,"abstract":"Breakwaters is one of type coastal structure that is mainly used as part for coastal protection purposes. Among the various types of breakwaters, likely rigid and hollow vertical pole types are one of the alternative structures for coastal protection. The utilization of this structure usually in the port area or in marina which protrudes into the sea. The pile breakwater test was carried out at laboratory experimental station for coastal engineering Buleleng Bali, on a scale of 1:10. This trial was carried out using pile materials using PVC pipes with a diameter of 6 cm. Scaling of this model is based on the piles used in the project sea dike stage A-NCICD. In testing this physical model several variations were carried out such as tata letak variation (N), wave height (h), wave period (t), distance between piles (columns) relative to diameter (B/D), and distance between piles (row) relative to diameter (b / D). Based on the test results obtained the optimal stacking configuration to reduce wave energy is a configuration with pole configuration B / D = 1; b / D = 0.5","PeriodicalId":356205,"journal":{"name":"JURNAL TEKNIK HIDRAULIK","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131217936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Wijaya, Arno Adi Kuntoro, Edy Anto Soentoro Gondodinoto
Some main issues related to the management of ground water resources are frequently faced by communities living in coastal areas in Indonesia, especially in the city of Jakarta, such as large population, rapid industrial and business growth, availability of groundwater resource and limitation of PAM (water supply company) capability, and Jakarta's geographic position with its aquifer system bordered by to the coastal. Those fundamental issues caused the saltwater intrusion in Jakarta to fade further into the freshwater aquifers system. The purpose of this study was to analyze the extent of the distribution of saltwater contamination to coastal aquifers in Jakarta so that it could be utilized in the policy formulation of ground water management and clean water management. The method used in this research was literature study, the data used in the form of secondary data and modeling conducted by the open source program well known as FREEWAT.The modeling of salt water intrusion on coastal aquifer of Jakarta was conducted into five model scenarios, namely (1) reduction of 50% of ground-water use, (2) reduction of 50% of groundwater use, (3) existing groundwater use in 2012, (4) increase of 25% of groundwater use, and (5) increase of 50% of groundwater use. From the modeling results, they were obtained the distribution of saltwater contamination on each layer of the aquifer of Jakarta. In unconfined aquifer the existing condition is scenario 3 intrusion as far as 1,604 m, on scenario 1 there is an intrusion decrease of 38%, in scenario 2 there is an intrusion decrease of 13%, in scenario 4 there is an increase in intrusion by 17% and on scenario 5 increase intrusion by 25%. In upper confined aquifer, the existing condition, namely scenario 3, has occurred as much as 1.809 m intrusion, in scenario 1 there is an intrusion decrease of 23%, in scenario 2 there is an intrusion decrease of 8%, in scenario 4 there is an increase in intrusion by 19% and in scenario 5 in-crease intrusion by 26%. In middle confined aquifer, the existing condition is scenario 3, 1.927 m intrusion occurs, on the scenario 1 there is an intru-sion decrease of 23%, in scenario 2 there is an intrusion decrease of 9%, in scenario 4 there is an increase in intrusion by 16% and in the scenario 5 increase intrusion by 22%.
{"title":"Pemodelan Intrusi Air Asin Pada Akuifer Pantai (Studi Kasus: DKI Jakarta)","authors":"A. Wijaya, Arno Adi Kuntoro, Edy Anto Soentoro Gondodinoto","doi":"10.32679/JTH.V10I1.583","DOIUrl":"https://doi.org/10.32679/JTH.V10I1.583","url":null,"abstract":"Some main issues related to the management of ground water resources are frequently faced by communities living in coastal areas in Indonesia, especially in the city of Jakarta, such as large population, rapid industrial and business growth, availability of groundwater resource and limitation of PAM (water supply company) capability, and Jakarta's geographic position with its aquifer system bordered by to the coastal. Those fundamental issues caused the saltwater intrusion in Jakarta to fade further into the freshwater aquifers system. The purpose of this study was to analyze the extent of the distribution of saltwater contamination to coastal aquifers in Jakarta so that it could be utilized in the policy formulation of ground water management and clean water management. The method used in this research was literature study, the data used in the form of secondary data and modeling conducted by the open source program well known as FREEWAT.The modeling of salt water intrusion on coastal aquifer of Jakarta was conducted into five model scenarios, namely (1) reduction of 50% of ground-water use, (2) reduction of 50% of groundwater use, (3) existing groundwater use in 2012, (4) increase of 25% of groundwater use, and (5) increase of 50% of groundwater use. From the modeling results, they were obtained the distribution of saltwater contamination on each layer of the aquifer of Jakarta. In unconfined aquifer the existing condition is scenario 3 intrusion as far as 1,604 m, on scenario 1 there is an intrusion decrease of 38%, in scenario 2 there is an intrusion decrease of 13%, in scenario 4 there is an increase in intrusion by 17% and on scenario 5 increase intrusion by 25%. In upper confined aquifer, the existing condition, namely scenario 3, has occurred as much as 1.809 m intrusion, in scenario 1 there is an intrusion decrease of 23%, in scenario 2 there is an intrusion decrease of 8%, in scenario 4 there is an increase in intrusion by 19% and in scenario 5 in-crease intrusion by 26%. In middle confined aquifer, the existing condition is scenario 3, 1.927 m intrusion occurs, on the scenario 1 there is an intru-sion decrease of 23%, in scenario 2 there is an intrusion decrease of 9%, in scenario 4 there is an increase in intrusion by 16% and in the scenario 5 increase intrusion by 22%.","PeriodicalId":356205,"journal":{"name":"JURNAL TEKNIK HIDRAULIK","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116740716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sungai Bengawan Solo mempunyai karakteristik sungai berliku (meander). Hal ini berpotensi untuk memicu terjadinya gerusan lokal akibat tingginya kecepatan aliran di tikungan luar sungai. Fenomena gerusan lokal ini terjadi pada ruas pertemuan Sungai Bengawan Solo dan Kali Pepe, tebing sungai sudah bergeser 2 meter. Hal ini menunjukkan bahwa erosi dan gerusan lokal telah terjadi dan memerlukan penanganan khusus karena gerusan tebing tersebut semakin mendekati jalan raya dan kawasan pemukiman warga. Penanganan yang dapat dilakukan adalah memproteksi tebing sungai yang kritis tersebut dengan struktur krib untuk mengarahkan aliran yang datang dengan kecepatan tinggi ke arah palung sungai sehingga tidak membahayakan tebing tanggul sungai. Penelitian ini mengkaji efektivitas penempatan tata letak krib di tikungan luar sungai melalui uji model fisik 3 dimensi di Laboratorium Hidraulika dan diverifikasi oleh pemodelan numerik 2 dimensi. Berdasarkan hasil uji model hidraulik fisik, pemasangan krib dan riprap dengan jarak dan dimensi yang optimum dapat meredam energi dan kecepatan aliran sungai untuk mengamankan tebing dan tanggul sungai.
{"title":"Efektivitas Krib Untuk Mengurangi Gerusan Di Tikungan Sungai Bengawan Solo","authors":"J. Zulfan, Yiniarti Eka Kumala","doi":"10.32679/JTH.V9I2.582","DOIUrl":"https://doi.org/10.32679/JTH.V9I2.582","url":null,"abstract":"Sungai Bengawan Solo mempunyai karakteristik sungai berliku (meander). Hal ini berpotensi untuk memicu terjadinya gerusan lokal akibat tingginya kecepatan aliran di tikungan luar sungai. Fenomena gerusan lokal ini terjadi pada ruas pertemuan Sungai Bengawan Solo dan Kali Pepe, tebing sungai sudah bergeser 2 meter. Hal ini menunjukkan bahwa erosi dan gerusan lokal telah terjadi dan memerlukan penanganan khusus karena gerusan tebing tersebut semakin mendekati jalan raya dan kawasan pemukiman warga. Penanganan yang dapat dilakukan adalah memproteksi tebing sungai yang kritis tersebut dengan struktur krib untuk mengarahkan aliran yang datang dengan kecepatan tinggi ke arah palung sungai sehingga tidak membahayakan tebing tanggul sungai. Penelitian ini mengkaji efektivitas penempatan tata letak krib di tikungan luar sungai melalui uji model fisik 3 dimensi di Laboratorium Hidraulika dan diverifikasi oleh pemodelan numerik 2 dimensi. Berdasarkan hasil uji model hidraulik fisik, pemasangan krib dan riprap dengan jarak dan dimensi yang optimum dapat meredam energi dan kecepatan aliran sungai untuk mengamankan tebing dan tanggul sungai.","PeriodicalId":356205,"journal":{"name":"JURNAL TEKNIK HIDRAULIK","volume":"39 5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133115895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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