Perairan Waduk Gajah Mungkur merupakan tipe perairan yang tergenang mempunyai dan arti penting bagi perikanan. Plankton di perairanWadukmempunyai peranan bagi sumberdaya perikanan, antara lain sebagai produsen primer dan dapat dijadikan sebagai indikator kualitas lingkungan perairan. Kelimpahan plankton di suatu perairan dipengaruhi oleh parameter lingkungan perairan. Penelitian ini bertujuan untukmengetahui tingkat kesuburan perairan, kelimpahan dan keanekaragaman plankton Penelitian dilakukan bulan Pebruari - Nopember 2010 dengan frekuensi pengambilan contoh sebanyak empat kali yaitu pada bulan Pebruari, Mei, Juli dan Nopember. Analisis tingkat kesuburan perairan dengan metode Carlon’s dapat diketahui perairan Waduk Gajah Mungkur termasuk katagori perairan dengan tingkat kesuburannya tinggi.Waduk GajahMungkur termasuk perairan dengan kelimpahan plankton tinggi dan keanekaragaman plankton rendah yang didominansi oleh Synedra ulna Gajah Mungkur reservoir is a lentic water and has significance impact for fishery. Plankton in the reservoir as the primary producer has an important role on fisheries, could be used as an indicator of aquatic environmental quality. Abundance of plankton will be influenced by environmental condition including water quality. The purpose of this study to determine the productivity level of water quality, abundance and diversity of plankton. The study was conducted from February to November 2010, with schedule of sampling was in February, May, July and November 2010. Based on analysis by Carlon’s method, the results showed that the water quality at Gajah Mungkur reservoirwas eutrophic level. Gajah Mungkur reservoir has high plankton abundance and low plankton diversity the species of plankton was dominated by Synedra ulna.
The conversion of peatland from forest to non-forest causes environmental damage and increases high land dryness. Mapping of peatland based on dryness is very important to control and prevent fires. This study aims at characterizing peatland based on the level of temperature vegetation dryness index (TVDI) and evaluating the correlation between TVDI value and soil moisture. The research was conducted in August 2018 during the dry season. The area of research located in peat hydrological unit of Sibumbung River-Batok River in Ogan Komering Ilir (OKI) District of South Sumatra Province covering 63,427 ha area that consists of various land uses. The result showed that extreme wet category is found in water bodies and secondary forests that have high density, moderate wet is found in paddy fields and grass, normal area is found in the area covered by low-density trees, moderate dry is found in shrubs and oil palm plantations with good management and extreme dry areas is found in grasses and oil palm with poor cultivation management. There is a correlation between the TVDI value to the soil moisture on 0-10 cm and 10-20 cm and 20-30 cm depth.
Abstract. Land use is one important factor in the planning of infrastructure development. The development that does not consider land use may cause an impact to environmental degradation. In minimizing the time and costs, the introduction of land use in an area could be done with remote sensing technology, one of the methods that could be used is the Normalized Different Vegetation Index (NDVI). NDVI is a combination of a multi-spectral band by using a wavelength Red and Near Infra-Red (NIR) on image Landsat 8 to estimate the vegetation cover. Than each classification of vegetation density will provide the reflectance value. In this study, the land cover classification result based on vegetation density by NDVI method, namely 0.5120 -0.3706 for the low-density vegetation area; 0.3706 -0.6149 for the moderate density vegetation area; and 0.6149 -0.8677 for the high-density vegetation area. While the overall accuracy percentage of land use classification was 80%.
Land subsidence is a problem that often occurs in lowland areas. The impact of land subsidence causes losses in the economic, physical, ecological and social aspects. The impact of land subsidence could be felt directly and indirectly by the people, so an evaluation of the most frequent (dominant) impacts needs to be done. One method that could be use for assesment using AHP, using pairwise comparisons can be obtained the most frequent (dominant) land subsidence impact. From the results of the study indicate that the direct impact due to land subsidence (weight 0.608)) is more dominant than the indirect impact (0.392). Based on the value of each parameter, three dominant land subsidence impacts are infrastructure damage with a value of 0.387, an increase in the cost of infrastructure construction and maintenance with a value of 0.193 and a flood of 0.129. The results of observations and ground checking at the Tanjung Api-Api area, there was damage to several floors of residents' homes, damage to road and tilt of trees which were damaged in the economic field was the most dominant impact. While floods and seawater intrusion are not dominant in this area because the area is located in the tidal area.
ABSTRACT:It is necessary to analyze the conditions of the watershed hydrometry, the type of land use, the duration and the time of rain, the tidal height, which is modeled spatially, in order to support in decision making for spatial management and water management. Palembang Metropolitan City is one of the major cities on the island of Sumatra, which is regionally included in the Musi Watershed area. Hydrologically Palembang City is located at the mouth of the Musi river, with an altitude of fewer than 20 m above the mean sea level. When the maximum rainfall occurs in the watershed Area, Palembang City will be affected by tidal water, and runoff on the sub-watershed in Palembang city cannot be flowed through the main channel within Palembang City, due to the tide of Musi river water. This study aims to show the relationship between watershed hydrometry, land use change management, rain intensity, and tidal influences on the watershed area, with various scenarios that will affect the runoff discharge and distribution of inundation that occurs in the watershed area. Taking a case study of the Lambidaro sub-basin, in the Palembang City area, all subbasin parameters that have been tested were modeled by a user flow to calculate the extent of runoff and flood flow tracking in the river. The inundation distribution occurring in the subwatershed was obtained by combining the results of hydrodynamic analysis and spatial analysis. Based on the results obtained it is concluded that there is a strong spatial relationship between land use and sub-basin morphometry and its effect on the extent of surface runoff.
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