Magma activities on earth surface cause dynamic of volcanic morphology from the volcanic cone up to fluvial volcanic plain. The changing of morphology is always followed by different slope, composition and thickness of material, and break of slope. This geomorphological conditions result in groundwater emerges forming spring belt. Accordingly, wether such phenomena are also the case in the west slope of Lawu volcano is investigated in this reseach. Hydrogeomorphology approach is applied to study of the spring characteristic and distribution in the research area. The result research shows that the distribution pattern of springs in the west slope of Lawu volcano is not like spring belt perfectly, like the strato volcano generally. It is caused by erosion processes, mass wasting intensively, Lawu fault and other faults. Most springs flow on the volcanic slope and volcanic foot morphology.
Purpose of this research is to study on aquifer hydrostratigraphy that can be a geo-indicator of geomorphological prosseses on the past, that describe of landform genetic in the research
AbstrakPenelitian ini dilakukan di kawasan gumuk pasir aktif pada lorong angin alami Pesisir Parangkusumo dengan tujuan mengetahui pengaruh tutupan lahan vegetasi pada bentuklahan gumuk pasir di Pesisir Parangkusumo, sedangkan perkembangan normal gumuk pasir terjadi tanpa tutupan. Penelitian ini merupakan penelitian eksploratif-survey dengan maksud mengungkapkan pengaruh vegetasi terhadap perkembangan bentuklahan, dengan fokus peran vegetasi sebagai ecological engineering. Penelitian dilakukan dengan mengidentifikasi pengaruh vegetasi dalam perkembangan gumuk pasir dilihat dari faktor pembentuk yaitu proses deflasi dan juga identifikasi morfologi. Hasil penelitian menunjukkan pada area gumuk pasir terdapat beberapa tipe vegetasi penutup yaitu vegetasi insitu dan eksitu. Vegetasi insitu merupakan vegetasi alami gumuk pasir yaitu pandan, rumput teki, dan siwalan; sedangkan vegetasi eksitu berupa penghutanan dengan vegetasi cemara dan akasia. Kedua tipe vegetasi tersebut berdampak terhadap dinamika perkembangan gumuk pasir yang terjadi secara perlahan dalam kurun waktu tertentu seiring dengan pertumbuhan vegetasi. Efek dari vegetasi menghasilkan gangguan gelembur permukaan sampai dengan perkembangan lubang deflasi sebagai indikator kerusakan gumuk pasir. Kata kunci: Gumuk Pasir, Vegetasi, Parangkusumo
There are some characteristics and distributions of unconfined groundwater variation in the research area. Those are related to a system of water supply and consumptive use for drinking water. Variation of the groundwater characteristic depends on variation of morphology. Therefore, it is needed to delineate hydromorphology units of the regions as a base on groundwater resources management, especially for drinking water. The aims of the research are: (1) to study of the characteristic and distribution of unconfined groundwater variations base on landform units, (2) to study the factors that affect such variations, and (3) to establish the hydromorphology units of the regions for groundwater resources management, especially for drinking water. The method used in this research is landform approach and field survey. The sampling method is stratified sampling, based on landform as the analysis approach. Result of the research shows that there are some variations of groundwater characteristic at each landform. Landforms which have good groundwater characteristic are Hydromorphology Unit of Fluvio Volcanic Plain of Young Merapi (except Bayat region) and Hydromorphology Unit of Volcanic Foot Plain of Young Merapi. At those units, there are good quality of groundwater, bicarbonate water (hydrochemical type I), having low electric conductivity, shallow of water table, low in fluctuation, and middle to fast class in aquifer permeability. Those units are the most potential unconfined groundwater resources management for drinking water. The units which have poor groundwater characteristic are Hidromorphology Unit in Bayat Region, including Undulating Alluvial Plain, Fluvio Volcanic Plain of Young Merapi, and Swamp Alluvial Plain. Generally, the groundwater quality is medium to poor, the hydrochemical type is Va (initiation process of connate water) and type III (evaporate water), shallow up to medium of water table, and low to middle class of aquifer permeability. The taste of groundwater is brackish to saline with high concentration of chloride.
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