Batu City has positioned itself as a center for organic agriculture based on international tourism, and, consistent with its vision in the Batu City Regional Spatial Plan for 2010-2030, the city will become a City of Tourism and Agropolitanism in East Java. From 2015 to 2020, Batu City increasingly developed, especially its tourism sector. The increased number of Batu City tourism sites indirectly illustrated changes in land use. The availability of relatively fixed land is not directly proportional to the high demand for land use and the decreasing vegetation cover. This has led to changes in land use and temperature. This research on temperature changes due to land conversion was carried out in Batu City, East Java. The research design employed Landsat 8 OLI/TIRS image processing using land surface temperature, the normalized difference vegetation index (NDVI), and the normalized difference built-up index (NDBI). The results showed a relationship between land conversion and temperature changes in Batu City, where there was a change in the land surface temperature interval in 2015-2020. Temperature changes were caused by conversion of forest into agricultural land and built-up land. Vegetated land areas were also converted, so land with dense and moderately dense vegetation decreased. The dense vegetation decreased from 3,757 hectares to 3,437 hectares, while the moderately dense vegetation decreased from 7,867 hectares to 7,531 hectares. Conversely, the sparsely vegetated land increased from 7,463 hectares to 8,117 hectares. Keywords: land surface temperature, land conversion, Batu City
Abstrak: Kebutuhan air yang semakin meningkat diharapkan berbanding lurus dengan ketersediaan air pada suatu wilayah. Maka diperlukan adanya identifikasi dan eksplorasi potensi airtanah menggunakan metode pendugaan geolistrik. Penelitian ini dilakukan di sebagian wilayah Kecamatan Wagir meliputi Desa Jedong dan Desa Sitirejo. Desa Jedong dianggap mewakili ketersediaan air sedikit dan Desa Sitirejo dianggap mewakili ketersediaan air banyak. Metode penelitian menggunakan metode survey geolistrik dengan Konfigurasi Schlumberger satu dimensi dengan pendugaan resistivitas Vertical Electrical Sounding (VES). Hasil dari penelitian memperoleh nilai Root Mean Square (RMS) Error sebesar 4.06% untuk Desa Sitirejo dan 12.1 % untuk Desa Jedong. Pada Desa Sitirejo lapisan kelima pada kedalaman 3,48 – 12,1 m diinterpretasikan sebagai air tanah. Hal ini didukung berdasarkan data Muka Air Tanah (MAT) dan kedalaman sumur galian penduduk di wilayah Desa Sitirejo yang cenderung dangkal. Pada Desa Jedong keberadaan airtanah tidak berada pada 5 lapisan yang telah dilakukan pengujian dan diasumsikan berada pada kedalaman lebih dari panjang bentangan. Tujuan dari penelitian ini adalah mengetahui potensi ketersediaan airtanah untuk penyediaan sumber air dalam pemenuhan kebutuhan domestik masyarakat menggunakan Metode Geolistrik dengan Konfigurasi Schlumberger di Desa Jedong dan Desa Sitirejo, Kecamatan Wagir. Kata kunci: Potensi airtanah, geolistrik, konfigurasi schlumberger Abstract: The increasing demand for water is expected to be directly proportional to the availability of water in an area. So it is necessary to identify and explore the potential for groundwater using geoelectrical estimation methods. This research was conducted in some areas of Wagir District including Jedong Village and Sitirejo Village. Jedong Village is considered to represent low water availability and Sitirejo Village is considered to represent high water availability. The research method uses a geoelectric survey method with a one-dimensional Schlumberger configuration with the estimation of Vertical Electrical Sounding (VES) resistivity. The results of the study obtained a Root Mean Square (RMS) Error value of 4.06% for Sitirejo Village and 12.1% for Jedong Village. In Sitirejo Village, the fifth layer at a depth of 3.48 – 12.1 m is interpreted as groundwater. This is supported by data on the Ground Water Level (MAT) and the depth of the dug wells of residents in the Sitirejo Village area which tend to be shallow. In Jedong Village the presence of groundwater is not in the 5 layers that have been tested and are assumed to be at a depth of more than the length of the stretch. The purpose of this study was to determine the potential availability of groundwater for the provision of water sources in meeting the domestic needs of the community using the Geoelectric Method with the Schlumberger Configuration in Jedong Village and Sitirejo Village, Wagir District. Keywords: Water potential, geoelectric, chlumberger configuration
The Bengawan Solo watershed is included in the 15 priority watersheds that must be restored because it is one of the 108 critical watersheds in Indonesia. It is indicated that the Bengawan Solo Hulu sub-watershed is experiencing pollution and water quality degradation due to the population growth rate and various community activities around the watershed area. This research was conducted to study pollution and water quality using a spatial approach in the Upper Solo Bengawan sub-watershed in the Central Java region. The research was conducted using the Pollution Index method and Geographically Weighted Regression (GWR) modeling using BOD, COD, TSS, TDS, DO and Phosphate parameters. The results of the Pollution Index carried out show that 5 sample points are included in the category of light pollution quality and 8 sample points are moderately polluted. The lowest pollution index value is 2. 87 at point 3 of the Upper Samin River area, Karanganyar Regency. The highest pollution index value is 7.5 at point 9 in the Lower Premulung River area, Surakarta City. The results of GWR on the dependent variable BOD show that the DO variable has the most significant effect. In the dependent variable COD, the BOD variable has the most significant effect. The TDS and Phosphate variables have the most significant effect on each dependent variable and the DO dependent variable shows that the BOD variable has the most significant effect compared to other variables. In the dependent variable COD, the BOD variable has the most significant effect. The TDS and Phosphate variables have the most significant effect on each dependent variable and the DO dependent variable shows that the BOD variable has the most significant effect compared to other variables. In the dependent variable COD, the BOD variable has the most significant effect. The TDS and Phosphate variables have the most significant effect on each dependent variable and the DO dependent variable shows that the BOD variable has the most significant effect compared to other variables.
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