The quality of coastal ground water on small islands has characteristics that are influenced by environmental and area factors. Yeben Island is a small island with an area of 0.57 km2 with priority coastal and marine tourism areas in the islands of Raja Ampat. This study aims to (1) analyze levels of ground water quality parameters and (2) analyze water samples against water quality standards. Groundwater samples taken as many as 4 samples from the study location. The location of water samples is in the morphology of the coastal plain. The analysis of each physical and chemical parameter of each groundwater sample is carried out by comparing the value of drinking water quality standards. The results are presented in a comparison table of quality standards and a graph of scaled values.Based on the results, the laboratory shows that it exceeds the quality standard of physical elements and chemical elements including fluoride, hardness, sulfate and organic substances. In general, the quality of water is poor. Poor ground water quality occurs due to the influence of sea water intrusion.
Lake Winong is one lake that is not dried on dry season. This lake is located in the Village Kepek, District Saptosari, Gunung Kidul Regency, Special Region Province Yogyakarta. This study was designed to determine the depth or bottom topography of Lake Winong to produce bathymetry maps. Firstly, a survey was conducted to measure the depth with an echosounder instrument. Principally, an echosounder records the time interval required by the emitted sound wave to propagate to the bottom and return, from which the distance or depth (m) can be computed. Secondly, the depth data were interpolated by initially cross-validating the smallest Root Mean Squared Errors (RMSE) of the Inverse Distance Weighting (IDW), kriging, and natural neighbor methods. Each was run with the power values (weight factors) of 0.5, 1, 2, and 3. The results showed that kriging interpolation with a power value of 3 yielded the smallest RMSE, namely 0.005, and the lake observed was -0.2 to -1.8 m deep, with the deepest location found in the middle of the lake.
Dote Village is located in Central Halmahera Regency with hilly morphology in the north and the coast bordering the Dote Sea (Halmahera Sea) in the south. The main transportation access in Dote Village is sea transportation. The condition of the Dote Sea waters which is busy with local transportation activities between villages requires updating data as basic information on the condition of the seabed depth (bathymetry). Seabed depth data can be obtained from bathymetric measurements and tidal analysis as a correction for bathymetric measurements. The morphological conditions of the seabed can provide information on the topographic characteristics of the seabed. Based on these conditions, the purpose of this research is to map the depth of the seabed (bathymetry) in the Dote Sea of Halmahera. The method used is direct measurement with echosunder. Then corrected with secondary data in the form of tidal condition data. Analysis of the data used is the value of the sea depth measured by echosounder compared to the mean sea level (MSL) (calculation of tides). Then mapping the morphology of the seabed using the slope method. The data used is the value of the depth of the sea (bathymetry) which is converted into the value of the slope with the analysis of the slope of the horton slope. Based on the measurement results, it is known that the bathymetry shows that the regional morphological conditions of the seabed slopes of the Halmahera Sea Dote are sloping.AbstrakDesa Dote berada di Kabupeten Halmahera Tengah dengan morfologi perbukitan di bagian utara dan pesisir yang berbatasan dengan Laut Dote (Laut Halmahera) di bagian selatan. Akses transportasi utama di Desa Dote adalah transportasi laut. Kondisi perairan Laut Dote yang ramai dengan kegiatan transpotasi lokal antar desa memerlukan pembaharuan data sebagai informasi dasar kondisi kedalaman dasar laut (batimetri). Data kedalaman dasar laut dapat diperoleh dari pengukuran batimetri dan analisis pasang surut sebagai koreksi pengukuran batimetri. Kondisi morofologi dasar laut dapat memberikan informasi karakteristik topografi dasar laut. Berdasarkan kondisi tersebut maka tujuan dari penelitian ini adalah pemetaan kedalaman dasar laut (batimetri) di Perairan Dote Laut Halmahera. Metode yang digunakan adalah pengukuran langsung dengan alat perum gema (echosunder). Kemudian dikoreksi dengan data sekunder berupa data kondisi pasang surut. Analisis data yang digunakan adalah nilai kedalaman laut hasil pengkuran dengan echosounder dibandingkan dengan nilai tinggi muka laut rata-rata atau mean sea level (MSL) (perhitungan pasang surut). Kemudian pemetaan morfologi dasar laut menggunakan metode kemiringan lereng. Data yang digunakan adalah nilai kedalaman laut (batimetri) yang dikonversi menjadi nilai kemiringan lereng dengan analisis kemiringan lereng horton. Berdasarkan hasil pengukuran diketahui batimetri diketahui bahwa kondisi morfologi regional lereng dasar laut Dote Laut Halmahera termasuk miring.
Irrigation has an important role and is one of the keys to success in increasing rice production in paddy fields. Trimulyo Village is one of the areas in Jetis District, Bantul Regency has the majority of people as farmers. There is no information about groundwater quality as agricultural feasibility in the area is the background of this research. The purpose of this study was to determine the feasibility of groundwater quality for agricultural irrigation using the Sodium Adsorption Ratio (SAR) method in Trimulyo Village, Jetis District, Bantul Regency, Special Region of Yogyakarta. The method used in this study was the testing of 2 groundwater samples in the laboratory and field observation of geology and geomorphology conditions. The parameters used are chemical parameters which include Sodium or Sodium (Na), Calcium (Ca), and Magnesium (Mg). Based on the results of laboratory tests and data analysis, that groundwater sample 1 had a SAR value of 0,63 then groundwater sample 2 had 0,75. Both groundwater samples have a water classification of Excellent or Very Good for agricultural irrigation.
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