GeographyRN: Water & Settlements (Sub-Topic)最新文献

筛选

英文中文

Determining Efficient Operating Modes and Sizes of Blades for Multi-Scraper Trench Excavators 确定多刮板挖沟机的有效工作模式和叶片尺寸

GeographyRN: Water & Settlements (Sub-Topic) Pub Date : 2020-08-17 DOI: 10.15587/1729-4061.2020.208957

S. Kravets, V. Suponyev, Aleksej Goponov, S. Kovalevskyi, A. Koval

{"title":"Determining Efficient Operating Modes and Sizes of Blades for Multi-Scraper Trench Excavators","authors":"S. Kravets, V. Suponyev, Aleksej Goponov, S. Kovalevskyi, A. Koval","doi":"10.15587/1729-4061.2020.208957","DOIUrl":"https://doi.org/10.15587/1729-4061.2020.208957","url":null,"abstract":"The presented results of scientific research are aimed at increasing the efficiency of trenching for laying the utility lines using new less energy-consuming technologies of excavating the soil with the working equipment of multi-scraper excavators. The proposed method of determining the efficient operating modes for excavators when digging a trench is based on the idea of cutting the soil with the blades at a critical depth level, which guarantees consumption of minimum specific energy and maximum efficiency of the machine. This becomes possible if the operation of such blades is provided with the absolute values and the ratio of the speeds of cutting and submitting the working body into the face. To determine the efficient modes of multi-scraper excavators and the size of their edge side blades, the conditions of their effective unloading were identified and the patterns of changing the soil movement over the surface of unloading scrapers depending on the time of unloading were determined. For the same purpose, the dependences of the blocked cutting speed on the trench width were determined and the technical performance of the excavator was specified on the basis of determining the soil bearing capacity for one group of blades. It is found that the time of unloading the soil from the scrapers very slightly depends on their angular velocity within its change in the unloading zone. On this basis, the maximum angular speed of the scrapers is determined. The identified indicators are related to the width of the edge side blades performing asymmetric locked cutting, whose dimensions were determined by calculations. The obtained efficient operating modes of scraper trench excavators and the size of their edge side blades allow developing practical recommendations for improving the working equipment of excavators of this type","PeriodicalId":115433,"journal":{"name":"GeographyRN: Water & Settlements (Sub-Topic)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125216447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Governing the Nile Under Climatic Uncertainty: The Need for a Climate-Proof Basin- Wide Treaty 在气候不确定的情况下治理尼罗河:需要一个不受气候影响的全流域条约

GeographyRN: Water & Settlements (Sub-Topic) Pub Date : 2019-08-25 DOI: 10.2139/ssrn.3680303

Mahemud Tekuya

{"title":"Governing the Nile Under Climatic Uncertainty: The Need for a Climate-Proof Basin- Wide Treaty","authors":"Mahemud Tekuya","doi":"10.2139/ssrn.3680303","DOIUrl":"https://doi.org/10.2139/ssrn.3680303","url":null,"abstract":"Climate change is projected to have catastrophic impacts on the hydrological cycle. Water availability, quantity, and demand will be affected. Existing studies and climate change models are commonly predicting increases in average annual temperature in the Nile Basin, leading to greater water loss due to evaporation. There is much less certainty in projections concerning future rainfall, river flows, and water availability in the Nile Basin. Studies concerning the later find contradictory results; one predicts floods and increased runoff, and the other predicts water scarcity and possible droughts. Proper governance of the Nile in the face of these uncertainties demands a response to two contradictory scenarios: either an increase in water availability and flooding or water scarcity and drought; each of which requires opposite adaptation strategies. Building flexible and resilient legal and institutional arrangements will no doubt be at the heart of such adaptation strategies. If climate change reduces the available water in the Nile Basin, competition for water between the Nile Basin States will intensify, possibly leading to conflict. If the available water resources increase due to climate change, this will create a need for a new legal response to flooding. In either case, flexibility is crucial in adapting to climate change. Drawing upon key findings from recent climate change modeling studies, this article analyses the intrinsic capacity of the fragmented legal regime governing the Nile watercourse to adapt to climate change. The article submits that the legal instruments governing the Nile watercourse do not possess the flexibility required for addressing the possible consequences of climate change. Indicating how flexibility can be built in the Nile watercourse treaties, the article proposes a climate-proofed basin-wide treaty.","PeriodicalId":115433,"journal":{"name":"GeographyRN: Water & Settlements (Sub-Topic)","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126824838","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Kinetic Reactive Transport Modelling of CCS Disaster Scenarios: CO2 or Brine Leakage from a CO2 Reservoir into a Freshwater Aquifer CCS灾害情景的动力学反应输运模型:二氧化碳或盐水从二氧化碳水库泄漏到淡水含水层

GeographyRN: Water & Settlements (Sub-Topic) Pub Date : 1900-01-01 DOI: 10.2139/ssrn.3366417

Zsuzsanna Szabó, N. Gál, Éva Kun, Csilla Király, T. Szőcs, G. Falus

引用次数: 0