Analisa Air Bawah Tanah pada Lokasi Tambang Batubara Tanah Laut Kalimantan Selatan

<p> </p><p class="BodyAbstract">The impact of coal mining will produce a reservoir due to cutting and excavation from the mined area. If it is left without any effort to improve the environment due to mining it will have an impact on the surrounding environment. Research conducted by the author to determine the effect that occurs with a reservoir due to coal mining in the surrounding area. Based on measurements using the geoelectric method, it can be seen the condition of the soil layer in the reservoir and surrounding areas so that it can be estimated the movement of underground water in the aquifer layer. By using a piezometer around the reservoir it can be seen the change in the level of the underground water level at a certain time and the water level in the reservoir is measured in elevation so that it can be predicted the flow direction that occurs. From the results of the study obtained the underground water level has a greater value than the water level in the reservoir, especially in the rainy season. This activity is the initial stage of the study to determine the effect of the reservoir on underground water conservation. For the next stage measurements are needed throughout the year by installing logers so that data can be recorded automatically digitally and doing model simulations using Modflow software to predict the effect of reservoirs on underground water conservation in the long.</p>

Improving the method for monitoring the piezometric level of underground water in production wells of the Kamchatka Territory

Приведен опыт в области контроля гидродинамического режима подземных напорных вод при их эксплуатации. Для измерения и корректировки результатов измерений пьезометрического уровня подземных вод в самоизливающихся скважинах использовали автономные автоматизированные измерительные устройства. Экспериментальные исследования проводили на наблюдательной скважине № 1 Мильковского месторождения подземных питьевых вод (Амшарикский участок). Результаты исследований показали, что максимальный уровень подземных вод соответствует периоду таяния снежного покрова (май–июнь). Минимальный уровень подземных вод наблюдали в апреле. Отмечено, что годовой график изменения уровня воды в скважине № 1 не соответствует полностью ни одному из типовых графиков, что свидетельствует о необходимости организации автоматизированного контроля гидродинамического режима данного месторождения подземных вод с целью защиты его от истощения и загрязнения. The experience in monitoring the hydrodynamic regime of underground pressure water in the process of exploitation is presented. To measure and correct the results of measurements of the piezometric level of underground water in blowing wells, self-contained automated measuring devices were used. The experimental studies were carried out at observation well No. 1 of the Mil’kovskoe deposit of underground drinking water (Amsharikski site). The research results showed that the maximum underground water level corresponded to the period of snow cover melting (May – June). The minimum underground water level was observed in April. It is noted that the annual schedule of the water level changes in well No. 1 does not fully comply with any of the standard schedules suggesting the need to establish automated control of the hydrodynamic regime of this underground water deposit in order to protect it from depletion and pollution.

Logit model application for valuating intangible benefits from the afforested areas

PurposeThe estimation of market value of intangible benefits of afforestation has always been a challenging task, and the contingent valuation method is a popular method used in environmental assessment. The NTPC set up a coal-based power plant in Korba, India and planted 1.6 million trees on 19% of the project area.Design/methodology/approachThe individual's mean and median willingness to pay (WTP) for four intangible benefits, namely, pollution control (PC), improvement in underground water level (IUGWL), soil conservation and remediation (SCR) in addition to total WTP from the afforestation program of NTPC were estimated using a customized procedure for logit model based upon respondent's age, education, occupation, income and bid amount asked to pay. Stratified multistage random sampling has been used to select the respondents.FindingsThe procedure increases the number of respondents who are willing to pay as compared to conventional CVM. The finding of the study shows that the highest WTP was observed for PC (Rs. 462.84 per month per household) followed by SCR and IUGWL, whereas for total WTP it was Rs. 972.60.Originality/valueThe proposed customized procedure and the results thereof would be useful in improving the WTP estimates for other similar studies in order to conserve the environment.

Foundation design on problematic soils with high underground water level

In this study, the foundation systems of a structure on different soil profiles and different groundwater levels are modeled and analyzed. Several difficulties encounter during the basic design and implementation phases. In particular, the high groundwater level, the load on the soil under the load-bearing capacity, liquefaction causes many problems such as emergence. Within the scope of this study, foundation systems which based on six different soil profiles with a high groundwater level modeled with Plaxis 2D program. Thus, the stress and displacement conditions of the soil about the foundation system as a result of the soil properties and groundwater level changes in problematic soils investigated.

Underground Water-Level Monitoring by Integrated Study of Geoelectric, Logging, Cutting and Pumping Data in Industrial Area of Candi Sub-District, Sidoarjo

Monitoring of underground water level with integrated data of geoelectric, logging, cutting and pumping has been done in industrial area of Candi Sub-district, Sidoarjo, which is productive aquifers with widespread area. The integrated study showed that monitoring aquifers in industrial wells has carried out at depths of 140-165 meters. The lithology of the aquifer layer consists of sand layer, clay, and gravel with a low resistivity value of 14.7 to 46.8 ohmmeters. The monitoring results showed that the use of underground water at night was higher than the day and the use on workday was higher than on holiday. The stable debit generated by monitoring wells was 8.41 lt/sec and the groundwater level would return to stable 2.17 meters if the well is rested for 3 hours. The implication of this study was monitorable of the dynamics underground water levels periodically.

Dynamic Reclamation Methods for Subsidence Land in the Mining Area with High Underground Water Level

Dynamic reclamation for subsidence land is a development trend of ecological restoration in the mining area. It emphasizes that treatments should be taken during or before land damage to control the ecological degradation. Because dynamic reclamation is a complex problem, there still exist many challenges that have to be studied for practical application. In this paper, taking subsidence land in the area with high underground water level as an example, according to the requirements of land use and economic development, key techniques for dynamic reclamation are analyzed based on mine subsidence theories. The research proposes a general mode for dynamic reclamation, and provides a method for calculating the control time of soil excavation, and puts forth an optimization thought for land use, then establishes a procedure for soil reconstruction. The results show that dynamic reclamation can reduce the cost and shorten the land waste time, and enhance the sustainable development ability of the mining area.