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Abstrak :
Penelitian yang dilakukan oleh Wahyu Riyadi, Endang Mardiati dan Heru Winayadi pada tahun 1999 telah menghasilkan apparatus untuk memodelkan aliran air tanah terkekang. Apparatus ini berada pada tahap pengembangan dimana masih memerlukan berbagai penyempurnaan dari sisi alatnya maupun protokolnya. Penelitian ini mengusulkan suatu protokol untuk memodelkan aliran air tanah terkekang dan transpor pencemar pada media berpori heterogen dengan menggunakan alat buatan Wahyu Riyadi, Endang Mardiati dan Heru Winayadi. Pemodelan ini meliputi aliran air pada kondisi steady dan transpor pencemar berupa NaCl. Protokol yang diusung haruslah memberi hasil yang akurat dan presisi sehingga dilakukan repetisi percobaan dengan protokol yang sama, yang nantinya akan diamati penyimpangan data antar percobaannya. Hasil dari penelitian ini belum dapat dinyatakan sempurna karena hasil percobaan belum akurat dan presisi. Karena itu diperlukan beberapa penyempurnaan pada alat dan protokol. ......Research conducted by the Wahyu Riyadi, Endang Mardiati and Heru Winayadi in 1999 has produced apparatus for modeling unconfined groundwater flow. This apparatus is at development stage where they still require improvements in the in terms of the instrument and protocols. This research proposes a protocol for modeling unconfined groundwater flow and transport of contaminants in the heterogeneous porous media. This includes modeling of water flow in steady state and pollutant transport in the form of NaCl. Protocols carried must generate accurate and precise result, so experiment repetitions were done with the same protocol, and the deviations of data between experiments will be observed. The results of this research has not been stated as perfect because the result of the experiment is not yet accurate and precise. Therefore some improvements on the equipments and protocols are needed.

Abstrak :
ABSTRAK
When a large dimension of rock needed for an armored layer of breakwater, the scarcity of it became a major adversity, because of that many research subject of using concrete as a substitute for rock performed. One of the research are the usage of concrete block for submerged breakwater as a method for avoiding a very large concrete block, but still able to withstood wave forces. The key is in the interlocking of each concrete block so it could achieve the desired result with a lesser dimension concrete block. The research was performed in Laboratory of Coastal Experimental Station, Water Resource Research Center, using a 2D channel. The facility used were flume channel, regular wave generator machine, wave dumper, wave probe, and computer for processing data. The experiment indicate that the wave energy attenuation depends on the dimension of interlocking concrete block type submerged breakwater. The dimension represented in the form of relation of the distance of water level to structures crest and the crests width. The breakwater performance of the concrete block is quite useful as an underwater coastal protection building viewed from reflection with a reflection coefficient of 34.7% at (h?d) / h = 0 and the peak width of B = 2.0