Abstract
The city of Semarang can generally be divided into two regions. The first is the upper region with hilly soil condition, solid and the height almost reaches 350 meters from the sea level.The second is the lower region which is softly grained alluvial plains. The position of the lower land of Semarang has same height with the sea level, so that is too risky when the water overflows onto mainland. The issues that arise, are the soil becomes land subsidence because additional load onto it, consolidation and the excessive groundwater so when tides has come through mainland and flood some territory of the lower land of Semarang. The purpose of this research is to create a map of puddle, because of land subsidence that has made “rob” (Java Slang) and extensive changes puddle from time to time. That results will make stakeholders to adjust the existing condition. The methodology of research is done by drilling machine on 5 points until 30 meters depth to get soils sample that spreads in the at whole of the lower land of Semarang. The sample has been obtained and also tested by using the mechanical properties and soil properties at UNISSULA’s soil mechanical laboratory. Based on the test lab,it is analyzed to get the result how deep the soil settlement caused due to consolidation. Finally it holds analyzing extensive changes puddle cause of land subsidence by using GIS. The result of this research is puddles map in Semarang city and it changes from time to time. Besides that the analysis is further to the north (seaward) down more, but the time also give the biggest impact of land subsidence.
Highlights
The city of Semarang can generally be divided into two regions
first is the upper region with hilly soil condition
when the water overflows onto mainland
Summary
Kota Semarang merupakan satu diantara kotakota besar di Indonesia dan menjadi Ibu Kota Propinsi Jawa Tengah. Adanya penambahan beban pada tanah aluvial akan terjadinya penurunan tanah karena konsolidasi yang mengakibatkan terjadinya amblesan (Land Subsidence) lahan di sebagian Kota Semarang menjadi masalah yang serius karena daerah tersebut umumnya merupakan kawasan permukiman. Penelitian dari Setyarini dan Agarsugi (2008) menjelaskan penurunan tanah (land subsidence) merupakan suatu fenomena alam yang banyak terjadi di kota besar yang berlokasi disekitar pantai atau dataran aluvial seperti Jakarta, Semarang dan Surabaya. Konsolidasi tanah dapat dihitung dari besarnya penurunan yang disebabkan konsolidasi primer dengan anggapan bahwa konsolidasi tersebut adalah konsolidasi satu dimensi yang dapat dirumuskan sebagai berikut (Craig 1978) dan (Das 1988). Terzaghi dan Taylor dalam Holtz (1985) yang pertama kali memperkenalkan teori kecepatan konsolidasi satu dimensi untuk tanah lempung yang jenuh air dengan anggapan sebagai berikut : a) Tanah (sistem lempung air) homogen b) Tanah benar-benar jenuh c) Kemampuan memampatkan air diabaikan d) Kemampuan memampatkan butir tanah diabaikan e) Aliran air hanya satu arah (pada arah pemampatan) f) Berlaku hukum Darcy.
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