Problems related to water resources are still a major concern in some regions in the tropical climate. The effect of seasonal changes on the physical parameters of water quality is quite clearly visible. This certainly can pose a serious risk if it takes place in the long term towards human health and the environment without conducting intensive studies. The approach of this study is to draw the relationship between seasonal changes and physical parameters of water quality in 185 points spread across 11 sub-districts. Water parameter data was analyzed using multivariate statistics. Based on multivariate analysis in the dry season, the regression equation Y = 343.482 X1 + 0.039 X2 - 0.016 X3 + 12.961 X4 + 124.773 X5 - 815.208 and rainy season Y = 273.119 X1 + 0.025 X2 + 0.336 X3 + 15.731 X4 + 39.731 X5 - 745.119 (X1 salinity, X2 resistivity, X3 depth, X4 TDS, and X5 temperature, with bound parameters or Y is conductivity). Based on the health standards of the Indonesia Health Ministry concluded that regions showed the zone of extreme changes is close to the coast.
Tui Hill is a limestone hill lined south of Padang Panjang. It is located between Rao-Rao Village and Tanah Hitam. Based on the results of investigations of researchers on the slopes of Bukit Tui limestone in the coordinates S0 ° 28'21.3 "E100 ° 24'00.4ʺ which are in the Tanah Hitam Village, there are many weak fields such as burly, steep slope geometry, influence on earthquake vibrations, and rainfall the high can lead to landslides on slopes, potential for landslides on the slopes of research can endanger road users and community settlements on slope locations. This study aims to analyze the potential of landslides based on the physical and mechanical properties of intact rocks, using the boundary equilibrium method. Then make reinforcement recommendations so that slope conditions are safe / stable. Based on the results of analysis and calculations in saturated conditions with the influence of earthquake factors 0,7 -0,9g the values of FK 1,461,1,295,and 1,144 were obtained. From the results of the analysis, the slope is unsafe / unstable. In the original condition with 0.9g earthquake factor, FK 1.364 is obtained. Based on the results of analysis and calculations, the slope reinforcement recommendation used is the wire mesh installation method (wiremesh) in slope face. INTISARIBukit Tui adalah bukit kapur yang berjajar di selatan Padang Panjang. Letaknya berada antara Kelurahan Rao-Rao hingga Tanah Hitam. Berdasarkan hasil investigasi peneliti pada lereng batu kapur Bukit Tui di kordinat S0°28'21.3" E100°24'00.4ʺ yang berada di Kelurahan Tanah Hitam dijumpai banyaknya bidang lemah berupa kekar, geometri lereng yang terjal, pengaruh terhadap getaran gempa, dan curah hujan yang tinggi dapat memicu terjadinya longsoran pada lereng. Potensi akan terjadinya longsoran pada lereng penelitian dapat membahayakan pengguna jalan dan pemukiman masyarakat di lokasi lereng. Penelitian ini bertujuan untuk menganalisis potensi longsor berdasarkan sifat fisik, dan mekanik batuan utuh, dengan menggunakan metode kesetimbangan batas. Kemudian membuat rekomendasi perkuatan agar kondisi lereng menjadi aman/stabil. Berdasarkan hasil analisis dan perhitungan dalam kondisi jenuh dengan pengaruh faktor gempa 0,7 -0,9g didapatkan nilai FK 1,461, 1,295, dan 1,144. Dari hasil analisis tersebut maka lereng dalam keadaan tidak aman/tidak stabil, Dalam kondisi asli dengan faktor gempa 0,9g didapatkan nilai FK 1,364 Berdasarkan hasil analisis dan perhitungan, maka rekomendasi perkuatan lereng yang digunakan adalah dengan metode perkuatan pemasangan jaring kawat (wiremesh) di muka lereng.
This research was conducted to monitoring mine landuse Changing in Limestone/Dolomite at PT. Bakapindo in Jorong Durian, Kenagarian Kamang, Kamang Magek District, Agam Regency, West Sumatra Province. This research was carried out through visual interpretation of remote sensing data. The remote sensing data used is the Landsat imagery 8 Oli in 2018 which will be classified by the Supervised Classification method. Based on the results of the Landsat imagery 8 Oli processing with the observation years of 2013, 2016 and 2018 it was found that the mine area in 2013 was 12.53 hectares, in 2016 the area was 13.1678 hectares and in 2018 14,7586 hectares. Based on the results of the Landsat imagery processing in the observation years of 2013, 2016 and 2018, that for the mine area each year the observation changes. In the period of 2013 to 2016, the mining area increased by 0.6378 hectares and in 2016 to 2018 it increased by 1.0806 hectare.
Tui Hill is a limestone hill lined south of Padang Panjang, located between Rao-Rao Village to Tanah Hitam. The results of research at Tui Hill at the location S0° 28’ 50.23” E100° 24’ 16.89”- S0° 28’ 49.19” E100° 24’ 17.07” located in Tanah Hitam Village has a covered dolomite rock slope. Based on the Indonesian earthquake zoning map, the city of Padang Panjang is classified as a high earthquake vibration zone, ranging from 0.8-0.9 g. The potential for landslides on the slopes of the study can lead to the closure of the access road to dolomite mining so that it can hamper road user traffic and disrupt mining production as well as potential material losses and fatalities This study aims to determine the Safety Factors on earthquake slope research and recommendations to increase the value of Safety Factors (FK). Based on the results of the analysis by simulating earthquake vibration values the maximum earthquake vibration values that can be held by slopes in a safe condition is 0.2 g or equivalent to 6.4-6.6 on the Richter Scale, namely with FK of 1,281. Then, the author issued for the slope by changing the slope of the slope from 53˚ to 25˚ increases can obtain a slope FK value of 1.438, according to Joseph E. Bowles (1984) the slope is in accordance with the safe conditions.
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