Abstract. During the last decades, large-scale land use changes took place in Hailiutu River catchment, a semi-arid area northwest China. These had significant impacts on water resources area. Insights into groundwater and surface interactions vegetation-water dependencies help to understand these formulate sustainable management policies. In this study, were identified using baseflow index at catchment scale, hydraulic temperature methods as well event hydrograph separation techniques...

Impervious surfaces have long been implicated in the decline of watershed integrity urban and urbanizing areas. Porous pavement is one solution to mitigating problem stormwater runoff problems. In this research, three available porous systems were investigated evaluate their infiltration capability precipitation. Experiments conducted simulate different kinds pavements having sub-base materials cells. The discharge volumes monitored from each cell, relationship between rainfall intensity,...

Abstract Release of nitrogen compounds into groundwater, particularly those from excessive agricultural fertilization, is a major concern in an aquifer recharge. Among the compounds, ammonium ( ) common one. In order to assess risk fertilizer contamination through infiltration, adsorption onto loamy soil profile (0–0.60 m depth) was studied using column experiment and modelling simulation. The used drawn field Xinzhen, Fangshan district, Beijing, China, reconstituted laboratory columns....

Water pollution and water shortage are two of the most important environmental problems in Beijing, China. quality rainfall from July to August 2011 runoff a felt roof an asphalt road were analyzed chemically further investigated because these potential sources for augmenting city supplies. Results indicate that chemical oxygen demand (CODCr), total phosphorus (TP), nitrogen (TN), ammonia (NH4+-N) concentrations initial roofs roads all exceeded Class V surface standard developed by Ministry...

Groundwater provides an important source of water for maize cultivation where the table is shallow in semi-arid Hailiutu River catchment Maowusu Desert on Erdos Plateau Northwest China. A HYDRUS-1D model unsaturated flow beneath a (Zea mays L.) field was calibrated and validated with measured soil contents at various depths during growing period from 30 April to 1 October 2011, 23 May 27 September 2012, respectively. The computed actual evapotranspiration (ETa) as 580 mm whole 2011....

The mechanical properties of fully-grouted bolt support are critical for the safety engineering works. To study influences factors including length and diameter, strength rock, fracture angle on support, compression tests were conducted an anchored rock mass, considering shortcomings pullout bolts. discrete element software PFC2D (4.0) was adopted numerical simulation analysis from two aspects, namely, stress distribution anchorage force supplied by such research found that increasing...

Urban surface water runoff typically contains high but varying amounts of organic matter and nutrients that require removal before reuse. Infiltration systems such as sunken lawns can improve quality. However, there is currently insufficient information describing the treatment efficiency lawn-based infiltration systems. In this study, novel lawn (SLISs) were designed their pollutant effectiveness was assessed. The results revealed SLISs with Poa pratensis Lolium perenne effectively removed...

Abstract Climate change would significantly affect crop evapotranspiration processes. Many studies have been conducted for various crops. However, there is a lack of sufficient observational evidence on how climate influence potato evapotranspiration. In this paper, an experimental field in Maowusu Desert, northwest China, was used to investigate the effect Temporal variations reference (ET 0 ) were comprehensively investigated during 1954–2013, which shows that annual temperature and ET had...

Hetao Irrigation District (HID) is one of the main regions for maize and sunflower production in North China. However, water resource shortages soil salinization greatly limit production. The surface irrigation method HID; however, now, plastic mulching drip area increasing to reduce enhance crop yield. In this study, water, salt, nitrogen contents at 0–100 cm layer under non-mulching conditions with irrigation—fertilizer broadcast practice fertigation were investigated elongation maturation...

Current rates of urban development will result in water runoff becoming a major complication pollution. To address the worsening situation regarding resource shortage and pollution, novel multilayer infiltration systems were designed their effectiveness for removing pollutants tested experimentally. The effectively removed most pollutants, including organic matter (chemical oxygen demand (CODCr)), total nitrogen (TN), ammonia-nitrogen (NH4(+)-N) phosphorus (TP). CODCr, TN, NH4(+)-N, TP...

Particularly in dry regions, the scarcity of high-quality fresh water has heightened importance urban runoff re-use, leading as well to improvement use efficiency through surface drip irrigation method. Given limited research on wetting front migration under a emitter, soil movement double-point-source emitter was investigated. An experimental bin designed and filled with silt loam soil, time domain reflectometry tensiometers were used measure moisture contents potential, respectively. The...

Abstract. During the last decades, large scale land use changes took place in Hailiutu River catchment, a semi-arid area northwest China. These had significant impacts on water resources area. Insights into groundwater and surface interactions vegetation-water dependencies help to understand these formulate sustainable management policies. In this study, were identified using baseflow index at catchment scale, hydraulic temperature methods as well event hydrograph separation techniques...

Electrochemical denitrifacation was studied for simultaneous reduction of nitrate and oxidation by-products (ammonia nitrite) on brass(Cu62Zn38) cathode DSA(Ti/IrO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> -Pt) anode. In the presence 0.50 g/L NaCl 0.5g/L Na SO xmlns:xlink="http://www.w3.org/1999/xlink">4</sub> as supporting electrolyte, NO xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> <sup...

Based on the analysis of precision moulding mechanism for cylindrical gears with arcuate tooth trace (arc gear), equation flank arc gear was derived preliminarily and ideal concave convex flanks were got by MATLAB simulation to achieve graphics rendering. On this basis, UG NX8.0, accurate three-dimensional modelling established be used finite element analysis. Then, problem that there is no standardised bending strength calculation formula gear, aid method (FEM) paper studied relationship...

Soil infiltration treatment was proved to be an effective and low-cost technique for municipal wastewater in many areas. This system intensified by combined stuffing (with zeolite, active carbon, sawdust scrap iron) set multilevel named Vertical Multilevels (VMSI). Bench-scale soil column experiments were performed laboratory investigate effects this kind of system. From the start-up 4th month, VMSI exhibited pollutants removals after maturation, with highest removal efficiency 88% chemical...