Judul: Pendugaan Limpasan menggunakan Model SCS-CN di DAS Semajid, Kabupaten Pamekasan, Provinsi Jawa Timur
Abstrak: Pendugaan besaran limpasan sebagai hasil transformasi curah hujan sangat penting untuk pengelolaan sumber daya air secara efektif, pendugaan banjir, pemodelan hidrologi, perencanaan penggunaan lahan, dan adaptasi perubahan iklim. Model SCS-CN merupakan model paling sederhana untuk menduga transformasi hujan menjadi limpasan. Salah satu aspek yang sulit digeneralisasikan dalam nilai CN adalah jumlah curah hujan yang tidak langsung mengalir saat hujan terjadi, dikenal sebagai abstraksi awal (Ia). Informasi penting lain untuk menduga limpasan menggunakan metode SCS-CN adalah data jenis tanah dan tutupan lahan. Penelitian ini bertujuan untuk mendapatkan pendugaan limpasan terbaik dari penggunaan ketelitian data penggunaan lahan dan jenis tanah serta nilai abstraksi curah hujan menggunakan metode SCS-CN di DAS Semajid. Hasil penelitian menunjukkan bahwa limpasan berhubungan erat dengan kelembaban awal tanah yang mempengaruhi nilai abstraksi awal. Nilai abstraksi 0,05S merupakan nilai yang paling sesuai. Selain nilai abstraksi awal, ketelitian data atau skala juga berpengaruh terhadap tingkat akurasi model. Data dengan tingkat ketelitian lebih rendah yaitu data jenis tanah dari FAO dan data tutupan lahan dari KLHK memperoleh tingkat akurasi yang lebih baik., Estimating the magnitude of runoff as a result of rainfall transformation is crucial for effective water resource management, flood estimation, hydrological modeling, land use planning, and climate change adaptation. The SCS-CN model is the simplest model for estimating the transformation of rainfall into runoff. One aspect that is difficult to generalize in the CN values is the amount of rainfall that does not directly contribute to runoff during rainfall events, known as initial abstraction (Ia). Other important information for estimating runoff using the SCS-CN method includes data on soil type and land cover. This study aims to obtain the best estimation of runoff by utilizing accurate data on land use, soil type, and the value of initial abstraction using the SCS-CN method in the Semajid Watershed. The research results indicate that runoff is closely related to the initial soil moisture, which affects the initial abstraction value. The value of 0.05S is the most appropriate value for abstraction. In addition to the initial abstraction value, data accuracy or scale also influences the accuracy level of the model. Data with lower accuracy, such as soil type data from FAO and land cover data from KLHK, achieved better accuracy levels.
Keyword: Akurasi model, Abstraksi awal, Ketelitian data, Limpasan, SCS-CN

Judul: Pendugaan Debit Puncak Menggunakan Model Rasional dan SCSCN (Soil Conservation Service-Curve Number); Studi Kasus di Sub-sub DAS Keyang, Slahung, dan Tempuran; Sub DAS Kali Madiun, DAS Solo
Abstrak: Flooding can occur as a result of an increase in the amount and velocity of run-off exceeds the capacity of drainage channels. In addition, floods can occur as a result when drainage channel capacity is reduced, so the amount and velocity of run-off exceeds the capacity whendrainage channels. The decreasing of dranaige channel capacity can occur because of the superficiality of the river due to sedimentation from erosion in the upstream, blockage by garbage or constriction by the accumulation in water bodies. The increasing of amount and velocity of run-off caused by extreme rainfall and changes in land us that causes land clearing and soil compaction. The amount and velocity of run-off that causes the maximum peak discharge (Qp) is important to be known, because it has potential to cause flooding. Peak discharge as important information fordesign of flood control is generally estimated by using the rational model and model of Soil Conervation Service-Curve Number (SCS-CN). To know the validity of both models by using available data in Sub-sub Watershed of Keyang, Slahung and Tampuran (KST), the models are tested by comparing the esimated and obsered Qp. Estimated Qp by using rational model with the peak discharge data in 2009 (39.10 mm precipitation) is 30.82% greater than observed Qp, while the result by using SCS-CN model is 113.87% greater. Estimted Qp by using rational model with maximum rainfall data in 2009 (45.97 mm) is 4,074.74% greater than observed Qp, while the result by using SCS-CN model is 18.06% smaller than observed Qp. The coefficient run-off that calculated by using the rational model is greater (0.375) than calculation by direct observational data (0.34).
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Judul: Distribution and Diversity of Ectoparasite Mites on Geckos in Indonesia
Abstrak: Data on the diversity and dispersal of parasitic mites on house geckos in Indonesia are very scarce. In this work, the distribution and diversity of mites living on three species of house geckos, namely Cosymbotus platyurus, Hemidactylus frenatus, and H. garnotii collected throughout Indonesia, has been elaborated. Geckos and mites were captured and immediately preserved in 70% ethanol. Whole mount of the mites was prepared by clearing in lactophenol followed by mounting on polyvinyl lactophenol solutions. The SEM preparation was conducted to examine the detail morphological characters of the mites. The results showed that among 448 individuals of geckos, 221 geckos were infected by Geckobia mites. Prevalences of C. platyurus, H. frenatus, and H. garnotii infested by mites were 14.8%, 50.69%, and 79.6%, respectively. Three different spesies of Geckobia (G1, G2, and G3) could be differentiated; and based on similarities of their morphological characters to ones described in published literatures, Geckobia G2 is Geckobia glebosum and Geckobia G3 is Geckobia bataviensis while G1 could not be identified to the species level. The highest mean intensity of Geckobia G1 infestation was found on H. garnotii (I=7.0), G. glebosum infestation on H. frenatus (I=3.5), and G. bataviensis infestation on H. garnotii (I=11.8). In general, C. platyurus was infested by the least number of mites. Geckobia G1 were found living on the skin folds on the claws, G. glebosum were found mainly on the body and thigh, and G. bataviensis were found on almost all parts of the host’s body. Geckobia mites are distributed randomly throughout Indonesian Archipelago, following the pattern of distribution of their hosts. So it is concluded that Geckobia G1, G. glebosum, and G. bataviensis are sympatric.
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