Slamet Suprayogi
Fakultas Geografi Universitas Gadjah Mada

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Journal : Jurnal SPATIAL Wahana Komunikasi dan Informasi Geografi

PENGARUH VARIASI PENGGUNAAN LAHAN PADA BERBAGAI FORMASI GEOLOGI TERHADAP RESESI ALIRAN DASAR DI DAS WURYANTORO PROPINSI JAWA TENGAH

Jurnal SPATIAL Wahana Komunikasi dan Informasi Geografi Vol 17 No 1 (2017): WAHANA KOMUNIKASI DAN INFORMASI GEOGRAFI
Publisher : Program Studi Pendidikan Geografi

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Abstract

In the environmental viewpoint, water and land characteristics are strongly influenced by some aspects such as layout, position, landscape development, natural factors and human activity impact.Spatial aspects of land and water resources are the asset of spatial-based national development. Land resources management need to consider the characteristic of both renewable and nonrenewable land resources.Hydrological characteristics is a result of interaction and interrelation of human socio-economic parameters with some watershed physical factors. Apart from that,  besides land use as physical factors, there are some other factors such as morphometry, lithology, geomorphology and geology. They are all naturally come from a watershed that cannot be altered by a human (unmanageable). Some combination of watershed physical factors and the manageable factors such as land use plan, slope, and slope length will give a specific watershed response to the rainfall. Eventually, this affects the large-small of river flows behavior. Baseflow river is an essential substance for the development of water resource management strategies at watershed scale. Therefore, this study aimed to estimate baseflow river recession at various geological formation. It also influences characteristics of baseflow recession in Wuryantorosub-watershed at Wonogiri district. Simultaneous Statistical Analysis (ANOVA) and partial (t-test) analysis show that there is a significant influence on the variation of land use in diverse geological formations toward the baseflow recession, with a determination coefficient value - Adjusted R-square is 58.1%.The simultaneous analysis describes a simultaneously effect of recession baseflow coefficient with value test of the test F table > F count at a level of confidence by 5%, and a partial analysis shows that all land use variations in three geological formations significantly influence baseflow recession. Recession model of these two relations is  Y = 1.426 + 0,583X1 + 0,384X2 + 0,269X3. This condition indicates that baseflow recession is influenced by some basic by a number of entire environmental attributes. Thus, there will be a sustainable synergy of baseflow recession management that maintain river pattern by the surrounding inhabitant as an alternative water supply for local communities. Keywords: Baseflow, perennial river, variations in land use, geological formations

STATUS MUTU KUALITAS AIR SUNGAI GARANG HILIR KAITANNYA DENGAN PERUBAHAN PENGGUNAAN LAHAN DI SUB DAS GARANG HILIR SEMARANG

Jurnal SPATIAL Wahana Komunikasi dan Informasi Geografi Vol 17 No 2 (2017): JURNAL SPATIAL WAHANA KOMUNIKASI DAN INFORMASI GEOGRAFI
Publisher : Program Studi Pendidikan Geografi

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Abstract

Changes in land use that occur in the watershed indicate a decrease in water quality one of them in the Garang Hilir Sub watershed . Land use in watershed has a great impact on river water quality. Changes in land cover and land management practices have been considered key factors affecting changes in hydrological systems, leading to changes in runoff and water quality. The objectives of the study were to assess changes in land use, changes in water quality and the linkages between them. The analysis used is land use change and calculation of  Water Quality Index-Garang Hilir River (IKA-SGH). Determination of Water Quality Index of Garang Hilir River (IKA-SGH) using objective analytical approach secondary data of water quality of measurement  from Environmental Agency (BLH) of Central Java Province from September 2002 to June 2014 in 4 (four) monitoring sites in Garang River. Water quality index is done in three stages namely the selection of dominant parameters with the help of Factor Analysis, the weighting of dominant parameters with Analytical Hierarchy Process (AHP) approach is Pairwise comparison and making sub-index graph. The effect of land use change on water quality using quantitative descriptive analysis. The data used to determine the relationship is the average value of the Garang River Water Quality Index (IKA-SGH) and the extent of land use change from 2002 to 2014. In general the quality status of water quality in Garang Hilir River from 2002 to 2014 is in the "Medium" category ( 50.1 - 70) to "Good" (70.1 - 90). The more towards the estuary, the decrease in IKA-SGH value tends to occur in the river segment. Land use from 2002 - 2014 in the study area tends to change widely in each year. The settlements experienced a widespread increase in their use (12%), while irrigated rice fields experienced the largest reduction of area (-77%). The more agricultural land and cultivated land that transformed into settlements and other constructed land such as for industry, shrubs and the increasing of settlements and other wastes (industrial) and open land in Garang Hilir Subwatershed, causing the decrease of water quality of Garang Hilir River.