民国时期甘肃民勤传统水利秩序的瓦解与“恢复”

本文以清代民国时期民勤"渠坝"关系为切入点,以数起"水案"为主线,复原了1920-1949年民勤传统水利秩序的转折过程。20世纪20-30年代,民勤传统"渠坝"体制已经因内部的"湖坝斗争""移丘户"问题而濒于瓦解,传统水规形同虚设,水利处于失序状态。1944-1949年国民政府和民勤地方政府试图建立政府主导的新型农田水利体系,促进农业发展。但这一过程未能解决"湖坝"对立与"移丘户"问题,当地民众重拾"传统水规"对抗这些新的水利政策,被重新强化的传统"水规"沿用至20世纪50年代。民国时期在河西走廊的水利建设缺乏改造传统水利秩序的针对性措施,政府力量仅依靠工程技术无法实现现代农田水利体系的建立,也难以真正提升区域经济。     

Density and isothermal compressibility of supercritical H2O–NaCl fluid: molecular dynamics study from 673 to 2000 K, 0.2 to 2 GPa,and 0 to 22 wt% NaCl concentrations

We report on molecular dynamics (MD) simulations for predicting the density and isothermal compressibility of an H₂O–NaCl fluid as a function of temperature (673–2000 K), pressure (0.2–2.0 GPa), and salt concentration (0.0–21.9 wt%). The atomistic behavior was analyzed via the hydration number of ions and number of ion pairs. Hydration numbers of Na⁺ and Cl^? increased with increasing pressure and decreasing temperature. Conversely, the fraction of Na–Cl ion pairs increased with decreasing pressure and increasing temperature. This hydration and association behavior is consistent with the low dielectric constant of H₂O under these conditions. The presence of polynuclear clusters of Na–Cl was confirmed at high temperatures, low pressures, and high salt concentrations. We propose a purely empirical equation of state (EoS) for H₂O–NaCl fluids under high temperatures and pressures that should be useful for estimating the fluid distribution in Earth's crust and upper mantle in relation to effects on earthquakes and volcanic eruptions.     

Geochemical fingerprinting of hydraulic fracturing fluids from Qusaiba Hot Shale and formation water from Paleozoic petroleum systems,Saudi Arabia

Provenance studies of produced water are essential to trace flow dynamics and reservoir compartmentalization in petroleum systems and to quantify fluid recovery rates from unconventional fracturing. Produced water from a hydraulically fractured well in the Qusaiba Hot Shale in the Northern Exploration Area, Saudi Arabia, was daily monitored and analyzed for water chemistry, and environmental (δ²H, δ¹³C, δ¹⁸O_H2O, δ¹⁸O_SO4, δ³⁴S_SO4, δ³⁷Cl, ⁸⁷Sr/⁸⁶Sr) and cosmogenic isotopes (³H, ¹⁴C, ³⁶Cl), to differentiate from reference fluids of supply water, fracturing fluids, and formation water from adjacent Paleozoic units. Initially, recovered water is composed of fracturing fluids and subsequently replaced by a homogeneous cut of pristine formation water. Formation water is composed of dominant meteoric water (approximately 84 vol%) and minor fossil evaporated seawater. The young ¹⁴C‐apparent age between 6000 and 6700 years BP and depleted δ¹⁸O/δ²H values for the meteoric component confirm the infiltration of surface water into the Qusaiba Hot Shale interval or adjacent units during the Early Holocene Pluvial Period under cooler and wetter climatic conditions than present, which suggest the presence of a very recent, dynamic hydraulic flow system. ³⁶Cl/Cl ratios between 102 × 10^?15 and 31 × 10^?15 are ambiguous and can be attributed to atmospheric recharge close to the coast, mixing of ³⁶Cl‐enriched Quaternary meteoric recharge with ³⁶Cl‐depleted fossil seawater, and/or hypogene production by U‐Th‐enriched host rock. Produced waters from Qusaiba Hot Shale are within the compositional range of Na‐Cl‐type formation water from Paleozoic reservoir units in northern Saudi Arabia with salinities from 30 000 to 130 000 mg l^?1. As a novel technological approach for exploration wells in Northern Saudi Arabia, multi‐isotopic methods were successfully implemented to quantify flowback volumes from hydraulic fracturing, and to fingerprint pristine formation water or pore water in Paleozoic systems on their provenance, residence time, migration pathways, and secondary alteration processes.     

Transforming cross‐cultural water research through trust,participation and place

Indigenous voices in government‐led natural resource management planning processes are often marginalised, misinterpreted, or excluded. Third parties, including government‐employed geographers, can act as knowledge brokers in defining Indigenous values and interests so they might be included in government planning processes. This paper reviews and assesses a research partnership that evolved to document the complex and diverse ecological and hydrological values held by Ngan'gi speakers about the Daly River and connected water places in the Northern Territory, Australia. The development of trust through the slow building of a relationship based on place‐based dialogue, a key aspect of participatory action research (PAR), created the foundation from which a mutually beneficial and respectful research partnership was able to, and continues to, evolve. Both research partners' perspectives are revealed here to articulate why the research partnership was deemed a success. Key lessons learned from the research partnership include the importance of trust, respect for place‐based learning, researcher and institutional flexibility, and awareness of the intricacies of relationship building and the benefits that research engagement can bring to Indigenous people and communities. We aim to further dialogue among geographers and interested disciplines as to the potential for PAR methods to foster mutually beneficial Indigenous–non‐Indigenous research partnerships.     

It's the Lungfish,stupid: knowledge fights,activism, and the science–policy interface

Since the post‐positivist turn in the 20th century, many scholars and philosophers have argued for the importance of Other Ways Of Knowing – including local, embodied, situated, partial, and indigenous knowledges – in developing a better understanding of the world. This argument has been further stressed by a large subset of scholars working in the fields of geography, policy, planning, natural resource management, and community development, yet in practice, positivism retains its epistemological dominance. Drawing from a case study of a dam proposal at Traveston Crossing, Queensland, Australia, this paper will explore these epistemological tensions from the perspective of those whose first/primary ways of knowing about the issue were marginalised, namely the local activists who opposed the proposal. Using data gathered from document analysis and interviews, the paper will explore how these activists implicitly understood this epistemological marginalisation, how they adopted and employed positivist knowledge and language to further the exposure and credibility of their campaign, how this credibility was mediated by their identities, how they strategically deployed different forms of knowledge at local, national, and international scales, and how their successful navigation of these epistemological tensions was critical to the ultimate success of their campaign.     

明清时期水工技术初探——以江苏淮安清口水利枢纽为例

2008—2013年,淮安市博物馆对淮阴区码头镇和洪泽县境内的里运河故道、坝址等明清水利工程遗址进行了调查和发掘,对这些遗产所体现的水利科技与水工技术有了进一步的揭示。大运河上最著名的清口水利枢纽工程是我国特有的防洪工程形式,堤防主要以土筑堤坝为主,自身有一套完整的防洪体系和养护方法,在堤坝的险要区段或薄弱地段采取相应的防护措施以增强其稳固性和抗冲击能力。遗址体现的土工技术、砖石工技术和埽工技术与文献记载相互印记,至今仍有十分重要的借鉴意义。     

Irrigator relations with water in the Sunraysia region,northwestern Victoria

Irrigated agriculture faces significant challenges under climate change, and may not be feasible in parts of the Murray‐Darling Basin beyond 2050. Recent research into the cultural politics of water has paid limited attention to the water cultures and relations of irrigators in Minority World countries. We analyse the water relations of grape farm irrigators in the Sunraysia region of Victoria using interviews and farm tours undertaken between 2014 and 2016. Findings are summarised under five themes: (1) the sociality of irrigation water, (2) temporal and spatial relations, (3) the risk of rain, (4) the micro‐scale of water knowledge, and (5) environment as actor. These themes shed light on the diverse relations that constitute both environmental and irrigation water. Irrigators are embedded in these relations at multiple scales, local and distant, mediated by technology and infrastructure. The scale of our focus makes visible water and other forms of environmental knowledge that often go unnoticed in broader debates over irrigation. The concept of “the environment”, understood as an embodied actor in policy discourse and by irrigators, is an emergent trend that warrants ongoing research attention.     

Economic challenges for the EU Water Framework Directive reform and implementation

The European Water Framework Directive (WFD) is a unique and historic piece of environmental legislation, combining ecological and economic dimensions. The aim of the WFD is to ensure sustainable socio-economic management of the resource, protecting the quantity and quality of water. The complexity of this political, ecological and economic framework has led to misinterpretation and implementation problems among Member States, and thus to unsatisfactory outcomes. This paper analyses the economic science challenges for the upcoming WFD reform and its subsequent implementation, and gives some recommendations about how to handle these challenges. Consensus is required on the definitions of the existing economic concepts and tools currently included in European Union (EU) water policy (through the original WFD) and the methods for operationalizing them. Additionally, this will help fill key gaps, such as the lack of suitably skilled practitioners and the need for homogeneous economic knowledge among Member States. Furthermore, it seems necessary to integrate additional emerging concepts into the water policy debate and its praxis in the EU context.     

The Earls of Thanet and the Industrialisation of the Valley of Eller Beck at Skipton,North Yorkshire

The wooded valley of Eller Beck at Skipton in North Yorkshire became the focus for the early industrialisation of the town during the 18th century, as the Earls of Thanet pursued improvement of their estates. Initially, investment was directed towards the quarrying of limestone and its export via the Springs Canal. The quarrying interest had shifted further east to Haw Bank by 1785, and a network of dams and watercourses was then constructed to power a new cotton mill. The canal was extended concurrently, and a railway from Haw Bank to a new canal terminus was constructed, transforming the historic landscape in the valley beneath the north walls of Skipton Castle. Downstream from the cotton mill, enterprising new industry was established at the former manorial corn and fulling mills. Recreational use of the woodland has since become a significant component within the regional tourist economy, thereby initiating a discrete new industrial phase.     

山西省柳林县集体化时期梯田建设考察

梯田是治山保水的重要措施,山西省柳林县的梯田建设在集体化时期经历了一个从无到有、从小到大的发展历程。贺昌农业社和韩家峪大队带动了黄土高原地区梯田建设的更新换代,普通百姓对梯田从排斥到接受、推广,其关键原因在于梯田能为农业生产带来实质性帮助,这也是梯田在集体化时期治理黄土高原丘陵沟壑区水土流失的最大价值所在。