The Shoreline Retreat and Spatial Analysis over the Coastal Water of Belawan

Abstract – An examination of shoreline retreat is conducted over the muddy coast in the vicinities of the port of Belawan. The related sea level rise is estimated using the well-known Bruun Rule based on the characteristics of mud profile prevalent along the eastern coast of North Sumatera Province. The spatial analysis involved is done utilizing the concept and procedure of GIS. The averaged shoreline retreat over the hot spot area of erosion, i.e. 18 m per year, implies that the relative rate of sea level rise is in the range of 14 to 18 mm per year, indicating an extremely severe rate. In addition, three other cases of simple GIS applications related to coastal water of the port are spatially demonstrated.  Keywords –  coastal water, coastal erosion, sea level rise, and GI

Best Fitting Methods for The Mud Profile Equations

In order to understand the dynamics of shoreline changes due to natural and anthropogenic causes, it is imperative for a coastal manager to comprehend the shore profile characteristics which are dependent on the sediment-wave interaction and can be depicted in a profile equation. Moreover, it is possible to derive the power form for the profile equation of a sandy coast based on the argument of wave energy dissipation per unit bed area and unit time. By using this same argument and considering the phenomenon that the main cause of wave damping over a muddy coast is due to energy absorption by the soft mud bottom, the mud profile equation can also be formulated. The aim of this study was to observe the mud profile equation geometry using best fitting method and to compare the characteristic features of the mud profiles using the field observation data. Shore profile data were measured from the muddy coast of Pantai Cermin in the eastern coast of North Sumatera Province. The data obtained were fitted to both the sand and mud profile equations. The procedures and results of the two best fitting methods, the nonlinear regression and the least square based trial and error search, were exhibited and compared. Several noteworthy features of the mud profile equation were found to be the same with the sand profile equation in describing the profile data. In order to provide a better profile and shoreline stabilization, it is recommended to use more complete observation data and good knowledge of shore profile by the coastal manager

Renewable energy source selection for a green port with AHP

In view of the need to reduce the greenhouse gas emission causing global climate change coupled with the necessity to protect the environment around port vicinities, the green port concept receives considerable attention. This concept's motivation is to balance environmental challenges with economic demands such that seaports improve their financial, commercial, and operational performances. In this regard, the use of renewable energy is one of the viable solutions. Based on the analytical hierarchy process (AHP) method, this paper presents a systematic approach for selecting the most suitable alternative of renewable energy sources. The results show that for the case of Kuala Tanjung Port, solar energy is the most favored alternative, followed by wind energy, biomass, and wave energy. It is hoped that this paper provides a starting point to plan for a long-term renewable energy strategy in the context of a green port

Analisis dan Experimen Perkuatan Plat Lantai dengan Menggunakan FRP

Pelat adalah salah satu elemen yang sangat penting dalam suatu bangunan. Pada beberapan bangunan pasti ditemukan pelat, baik pelat lantai maupun pelat atap yang mengalami keretakan. Keretakan ini dapat disebabkan oleh bebrapa faktor, baik dari kualitas materialnya maupun teknik dalam pengerjaannya serta akibat bencana alam. Metode pengujian dilakukan terhadap 4 (empat) buah benda uji pelat beton bertulang ukuran 2250 x 100 x 150 cm dalam memikul beban yang menghasilkan lentur murni dan ke 4 (empat) kelompok benda uji yaitu pelat beton bertulang normal dan balok beton bertulang dengan perkuatan CFRP dengan metode dilapisi Plat dengan 1 Lapis CFRP satu arah (Unidirectional), Plat dengan 1 Lapis CFRPdua arah (Bidirectional) dan Plat dengan 1 Lapis CFRP tiga arah (Pseudoisotropic) Selanjutnya benda uji diberikan beban terpusat sampai pelat beton bertulang runtuh sehingga diketahui beban maxsimum dan lendutannya. Hasil experimen menunjukkan bahwa penambahan dilapisi Plat dengan 1 Lapis CFRP satu arah (Unidirectional) mampu meningkatkan kuat lentur sebesar 72,22 % dari kekuatan awalnya dan Plat dengan 1 Lapis CFRPdua arah (Bidirectional) mampu meningkatkan kuat lentur sebesar 77,78 % dari kekuatan awalnya serta Plat dengan 1 Lapis CFRP tiga arah (Pseudoisotropic)mampu meningkatkan kuat lentur sebesar 94,44 %. Dari kekuatan awalnya. &nbsp

Pemanfaatan Metode AHP dalam Pemilihan Proyek Infrastruktur

Public Private Partnership (PPP) di Indonesia dikenal sebagai Kerjasama Pemerintah dengan Badan Usaha (KPBU). KPBU didefinisikan sebagai Kerjasama antara Pemerintah dan Badan Usaha dalam penyediaan infrastruktur yang bertujuan untuk kepentingan umum dengan mengacu pada spesifikasi yang telah ditetapkan sebelumnya oleh Menteri/Kepala Lembaga/Kepala Daerah/Badan Usaha Milik Negara/Badan Usaha Milik Daerah (BUMN/BUMD), yang sebagian atau seluruhnya menggunakan sumber daya Badan Usaha dengan memperhatikan pembagian risiko di antara para pihak. KPBU dapat membantu pemerintah dalam pembangunan infrastruktur, namun sering kali badan usaha yang ingin berinvestasi mengalami kesulitan dalam menentukan proyek yang akan dipilih. Secara umum dalam berinvestasi pendekatannya hanya terfokus pada pengembalian modal dan tidak mempertimbangkan faktor-faktor lainnya. Studi ini menjelaskan pendekatan yang mempertimbangkan kriteria-kriteria khusus, pengetahuan tentang infrastruktur tersebut, dan permasalahan kebutuhan yang dirasakan di masyarakat. Dalam pendekatan ini digunakan penilaian kriteria untuk penyusunan rencana KPBU (PPP Planning). Proses Analytical Hierarchy Process (AHP) digunakan untuk menyelesaikan proses pemilihan dan pembobotan multi kriteria. Hasil analisa dari pemilihan dan pembobotan multi kriteria dapat membantu dalam menentukan tingkat prioritas proyek KPBU

Penentuan Prioritas Pengelolaan Daerah Aliran Sungai Deli Menggunakan Indeks Potensi Erosi

Karena keterbatasan sumber daya, pengimplementasian pengelolaan DAS sering dinilai tidak praktis untuk mengatasi masalah erosi tanah pada daerah tangkapan air yang luas. Maka dari itu, penentuan prioritas DAS menjadi pendekatan yang masuk akal dengan membuat urutan mikro DAS sesuai prioritas perawatan yang menggunakan perhitungan konservasi tanah yang sesuai. Tujuan dari penelitian ini adalah menentukan prioritas mikro DAS pada sungai Deli menggunakan metode indeks potensial erosi (EPI) yang menunjukkan kapasitas erosi. EPI dalam penelitian ini diukur menggunakan lima aspek informasi spasial dalam format GIS, yakni tutupan lahan, kondisi tanah, kemiringan lahan, kerapatan sungai, dan curah hujan. Semua aspek tersebut terintegrasi dan dikombinasikan secara linier menggunakan bobot yang ditentukan dengan metode AHP. Hasil penelitian menunjukkan bahwa jumlah keseluruhan yang berada pada prioritas tinggi hingga sangat tinggi adalah sebanyak 36 mikro DAS dari 53 DAS. Hal ini menekankan kebutuhan pengelolaan DAS

A Study on the Estimation of Flood Damage in Medan City

A large part of the Medan City, a city of more than 2 million people, experiences frequent floods which cost a lot of damage due to the inundation. The objective of this study is to estimate the area of inundation and the consequent damage cost with reference to the predicted discharges of the rivers crossing the city in a certain return period. Two main watersheds are involved here, i.e. the watersheds of Belawan and Deli.The relevant data for the flood estimation include rain fall, watersheds, as well as river profiles and cross-sections. The computed and mapped flood affected area is then stacked on top of the city maps in a GIS framework. By identifying the number of affected houses, the damage cost for a return period of flood can be estimated in a relative accurate manner. Also the affected city infrastructures can be shown and listed

A Study on the Estimation of Flood Damage in Medan City

A large part of the Medan City, a city of more than 2 million people, experiences frequent floods which cost a lot of damage due to the inundation. The objective of this study is to estimate the area of inundation and the consequent damage cost with reference to the predicted discharges of the rivers crossing the city in a certain return period. Two main watersheds are involved here, i.e. the watersheds of Belawan and Deli.The relevant data for the flood estimation include rain fall, watersheds, as well as river profiles and cross-sections. The computed and mapped flood affected area is then stacked on top of the city maps in a GIS framework. By identifying the number of affected houses, the damage cost for a return period of flood can be estimated in a relative accurate manner. Also the affected city infrastructures can be shown and listed