Relationship between Concentration and Discharge on Storm Events: Case Study at Cakardipa Catchment, Cisukabirus Subwatershed, Upper Ciliwung Watershed, Bogor, West Java

River nutrient loadings rates are frequently determined from discharge and hydrochemistry relationships using regression techniques. Unfortunately such methods as a conventional technique are inadequate for dealing with the problem such as differences in shape and direction of loop forming in individual and seasonal storms. Besides the relationships are nonlinear and time-dependent, they also varies from site to site. There is a currently method to study hysteresis between discharge and concentration of hydrochemistry. The relationship between discharge and solute concentration was investigated at Cakardipa catchment, Upper Ciliwung watershed, between the years of 2009-2010. The characteristics of the hysteresis loops were used to evaluate the temporal variation of the relative contribution to stream flow of source waters at Cakardipa Catchment including groundwater (CG), soil water (CSO), and rain water (CR). Chemical water analysis was carried out on 497 water samples on storm event. The chemical analysis of storm event of Februari 14, 2010 was carried out for the concentrations of K+, Ca2+, Mg2+, Na+, SiO2, SO42-NO3-, Cl-, and HCO3-. Results of the experiment showed that concentrations displayed circular hysteresis loops during the events, highlighting the complex relation among solutes and discharge during storm hydrographs. The solutes of K, Na, and Ca produced concave curvature, anti-clockwise hysteresis loops, and positive trend, so that classified as A2 loops with components ranking were CR> CG> CSO. .The solutes of Mg, SO4, NO3 assumed to come from groundwater produced convex curvature, clockwise hysteresis loops, and positive trend, indicating a concentration component ranking of CG > CR > CSO (C2 model). While Si and Cl produced clockwise hysteresis loops, indicating a concentration component ranking of CG> CSO> CR which was C1 model.

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Synthesis and Ferroelectric Properties of Sol–Gel Derived Intergrowth-Superlattice-Structured SrBi4Ti4O15-Bi4Ti3O12 Thin Films

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.197-198.1781 ◽

2011 ◽

Vol 197-198 ◽

pp. 1781-1784

Author(s):

Hua Wang ◽

Jian Li ◽

Ji Wen Xu ◽

Ling Yang ◽

Shang Ju Zhou

Keyword(s):

Thin Films ◽

Remanent Polarization ◽

Annealing Temperature ◽

Ferroelectric Properties ◽

Sol Gel ◽

Hysteresis Loops ◽

Si Substrates ◽

Gel Processing ◽

Coercive Electric Field ◽

Clockwise Hysteresis

Intergrowth-superlattice-structured SrBi4Ti4O15–Bi4Ti3O12(SBT–BIT) films prepared on p-Si substrates by sol-gel processing. Synthesized SBT–BIT films exhibit good ferroelectric properties. As the annealing temperature increases from 600°C to 700°C, the remanent polarization Prof SBT–BIT films increases, while the coercive electric field Ecdecreases. SBT–BIT films annealed at 700°C have a Prvalue of 18.9µC/cm2which is higher than that of SBT (16.8µC/cm2) and BIT (14.6µC/cm2), and have the lowest Ecof 142 kV/cm which is almost the same as that of SBT and BIT. The C-V curves of Ag/SBT-BIT/p-Si heterostructures show the clockwise hysteresis loops which reveal the memory effect due to the polarization. The memory window in C-V curve of Ag/SBT-BIT/p-Si is larger than that of Ag/SBT/p-Si heterostructure or Ag/BIT/p-Si heterostructure.

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DOC sources and DOC transport pathways in a small headwater catchment as revealed by carbon isotope fluctuation during storm events

Biogeosciences ◽

10.5194/bg-11-3043-2014 ◽

2014 ◽

Vol 11 (11) ◽

pp. 3043-3056 ◽

Cited By ~ 32

Author(s):

T. Lambert ◽

A.-C. Pierson-Wickmann ◽

G. Gruau ◽

A. Jaffrezic ◽

P. Petitjean ◽

...

Keyword(s):

High Resolution ◽

High Flow ◽

Published Data ◽

Storm Events ◽

Transport Pathways ◽

Relative Contribution ◽

Temporal And Spatial ◽

High Flow Period ◽

Doc Flux ◽

Headwater Catchment

Abstract. Monitoring the isotopic composition (δ13CDOC) of dissolved organic carbon (DOC) during flood events can be helpful for locating DOC sources in catchments and quantifying their relative contribution to stream DOC flux. High-resolution (< hourly basis) δ13CDOC data were obtained during six successive storm events occurring during the high-flow period in a small headwater catchment in western France. Intra-storm δ13CDOC values exhibit a marked temporal variability, with some storms showing large variations (> 2 ‰), and others yielding a very restricted range of values (< 1 ‰). Comparison of these results with previously published data shows that the range of intra-storm δ13CDOC values closely reflects the temporal and spatial variation in δ13CDOC observed in the riparian soils of this catchment during the same period. Using δ13CDOC data in conjunction with hydrometric monitoring and an end-member mixing approach (EMMA), we show that (i) > 80% of the stream DOC flux flows through the most superficial soil horizons of the riparian domain and (ii) the riparian soil DOC flux is comprised of DOC coming ultimately from both riparian and upland domains. Based on its δ13C fingerprint, we find that the upland DOC contribution decreases from ca.~30% of the stream DOC flux at the beginning of the high-flow period to < 10% later in this period. Overall, upland domains contribute significantly to stream DOC export, but act as a size-limited reservoir, whereas soils in the wetland domains act as a near-infinite reservoir. Through this study, we show that δ13CDOC provides a powerful tool for tracing DOC sources and DOC transport mechanisms in headwater catchments, having a high-resolution assessment of temporal and spatial variability.

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The effects of the big storm events in the first half of 2015 on the radiation belts observed by EPT/PROBA-V

Annales Geophysicae ◽

10.5194/angeo-34-75-2016 ◽

2016 ◽

Vol 34 (1) ◽

pp. 75-84 ◽

Cited By ~ 10

Author(s):

V. Pierrard ◽

G. Lopez Rosson

Keyword(s):

Charged Particle ◽

High Resolution ◽

Geomagnetic Storm ◽

Energetic Particle ◽

High Energy ◽

Radiation Belts ◽

Radiation Environment ◽

Storm Event ◽

Storm Events ◽

Particle Radiation

Abstract. With the energetic particle telescope (EPT) performing with direct electron and proton discrimination on board the ESA satellite PROBA-V, we analyze the high-resolution measurements of the charged particle radiation environment at an altitude of 820 km for the year 2015. On 17 March 2015, a big geomagnetic storm event injected unusual fluxes up to low radial distances in the radiation belts. EPT electron measurements show a deep dropout at L > 4 starting during the main phase of the storm, associated to the penetration of high energy fluxes at L < 2 completely filling the slot region. After 10 days, the formation of a new slot around L = 2.8 for electrons of 500–600 keV separates the outer belt from the belt extending at other longitudes than the South Atlantic Anomaly. Two other major events appeared in January and June 2015, again with injections of electrons in the inner belt, contrary to what was observed in 2013 and 2014. These observations open many perspectives to better understand the source and loss mechanisms, and particularly concerning the formation of three belts.

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Low hydrological connectivity after summer drought inhibits DOC export in a forested headwater catchment

Hydrology and Earth System Sciences ◽

10.5194/hess-25-5133-2021 ◽

2021 ◽

Vol 25 (9) ◽

pp. 5133-5151

Author(s):

Katharina Blaurock ◽

Burkhard Beudert ◽

Benjamin S. Gilfedder ◽

Jan H. Fleckenstein ◽

Stefan Peiffer ◽

...

Keyword(s):

Riparian Zone ◽

Hysteresis Loops ◽

Hydrological Connectivity ◽

Summer Drought ◽

Carbon Cycles ◽

Relative Contribution ◽

Doc Export ◽

Key Driver ◽

Doc Load

Abstract. Understanding the controls on event-driven dissolved organic carbon (DOC) export is crucial as DOC is an important link between the terrestrial and the aquatic carbon cycles. We hypothesized that topography is a key driver of DOC export in headwater catchments because it influences hydrological connectivity, which can inhibit or facilitate DOC mobilization. To test this hypothesis, we studied the mechanisms controlling DOC mobilization and export in the Große Ohe catchment, a forested headwater in a mid-elevation mountainous region in southeastern Germany. Discharge and stream DOC concentrations were measured at an interval of 15 min using in situ UV-Vis (ultraviolet–visible) spectrometry from June 2018 until October 2020 at two topographically contrasting subcatchments of the same stream. At the upper location (888 m above sea level, a.s.l.), the stream drains steep hillslopes, whereas, at the lower location (771 m a.s.l.), it drains a larger area, including a flat and wide riparian zone. We focus on four events with contrasting antecedent wetness conditions and event size. During the events, in-stream DOC concentrations increased up to 19 mg L−1 in comparison to 2–3 mg L−1 during baseflow. The concentration–discharge relationships exhibited pronounced but almost exclusively counterclockwise hysteresis loops which were generally wider in the lower catchment than in the upper catchment due to a delayed DOC mobilization in the flat riparian zone. The riparian zone released considerable amounts of DOC, which led to a DOC load up to 7.4 kg h−1. The DOC load increased with the total catchment wetness. We found a disproportionally high contribution to the total DOC export of the upper catchment during events following a long dry period. We attribute this to the low hydrological connectivity in the lower catchment during drought, which inhibited DOC mobilization, especially at the beginning of the events. Our data show that not only event size but also antecedent wetness conditions strongly influence the hydrological connectivity during events, leading to a varying contribution to DOC export of subcatchments, depending on topography. As the frequency of prolonged drought periods is predicted to increase, the relative contribution of different subcatchments to DOC export may change in the future when hydrological connectivity will be reduced more often.

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Combining concentration-discharge hysteresis and reach-scale lateral flow modelling to characterize flood water origin and processes: application to karst catchments

10.5194/egusphere-egu21-14832 ◽

2021 ◽

Author(s):

Martin Le Mesnil ◽

Jean-Baptiste Charlier ◽

Roger Moussa ◽

Yvan Caballero

Keyword(s):

Surface Runoff ◽

Hysteresis Loops ◽

Hydrological Processes ◽

Storm Events ◽

New Classification ◽

Catchment Scale ◽

Saturation State ◽

Relationship Analysis ◽

Water Origin

<p>We propose a data-driven approach of concentration-discharge (C-Q) relationship analysis, including a new classification of C-Q hysteresis loop at the catchment scale, combined to a simulation of lateral Q and C at the reach scale. We analyse high-frequency, multiple-site records of Q and electrical conductivity (EC) in karst catchment outlets, in which EC informs on water residence time. At the catchment scale, contributions of pre-event water (PEW) and event water (EW) during storm events are investigated through hysteresis loops analysis, which allows inferring hydrological processes. Our new classification of hysteresis loops is based on loop mean slope and hysteresis index. At the reach scale, lateral Q and EC are simulated using a diffusive wave equation model, providing a more spatialized picture of PEW and EW contributions to streamflow during storm events. The methodology is applied to two catchments (Loue river and C&#232;ze river) in France, including 8 gauging stations with hourly Q and EC time series covering 66 storm events.</p><p>For both catchments, a conceptual model of water origin and hydrological-processes seasonal and spatial variability is drawn. Regarding Loue catchment, summer and fall storm-events are characterized by contribution of PEW through piston-type flows, whereas decreasing EC values in winter and spring storm-events indicate the major contribution of EW through surface runoff and following fast infiltration in karst. EW contribution is increasing towards downstream. Regarding C&#232;ze catchment, higher contributions of EW are observed, indicating that fast infiltration and surface runoff are the dominant processes, associated to a PEW signature in summer and fall. PEW contribution also increases in karstified areas. Intra-site water origin seasonality is mostly related to karst aquifer saturation state, whereas inter-site variability is linked to karst areas extension. These results are encouraging to extend this approach to a variety of sites, notably influenced by important surface water/groundwater interactions, and groundwater flooding.</p>

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Fine Sediment Modeling During Storm-Based Events in the River Bandon, Ireland

Water ◽

10.3390/w11071523 ◽

2019 ◽

Vol 11 (7) ◽

pp. 1523 ◽

Cited By ~ 1

Author(s):

Juan T. García ◽

Joseph R. Harrington

Keyword(s):

Suspended Sediment ◽

Suspended Sediment Concentration ◽

Sediment Concentration ◽

Fine Sediment ◽

Storm Event ◽

Storm Events ◽

Event Scale ◽

Model Based ◽

Sediment Volume ◽

Bed Erosion

The River Bandon located in County Cork (Ireland) has been time-continuously monitored by turbidity probes, as well as automatic and manual suspended sediment sampling. The current work evaluates three different models used to estimate the fine sediment concentration during storm-based events over a period of one year. The modeled suspended sediment concentration is compared with that measured at an event scale. Uncertainty indices are calculated and compared with those presented in the bibliography. An empirically-based model was used as a reference, as this model has been previously applied to evaluate sediment behavior over the same time period in the River Bandon. Three other models have been applied to the gathered data. First is an empirically-based storm events model, based on an exponential function for calculation of the sediment output from the bed. A statistically-based approach first developed for sewers was also evaluated. The third model evaluated was a shear stress erosion-based model based on one parameter. The importance of considering the fine sediment volume stored in the bed and its consolidation to predict the suspended sediment concentration during storm events is clearly evident. Taking into account dry weather periods and the bed erosion in previous events, knowledge on the eroded volume for each storm event is necessary to adjust the parameters for each model.

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Geospatial Modelling of Watershed Peak Flood Discharge in Selangor, Malaysia

Water ◽

10.3390/w11122490 ◽

2019 ◽

Vol 11 (12) ◽

pp. 2490 ◽

Cited By ~ 1

Author(s):

Ryan Cheah ◽

Lawal Billa ◽

Andy Chan ◽

Fang Yenn Teo ◽

Biswajeet Pradhan ◽

...

Keyword(s):

Hydrological Modeling ◽

Estimation Methods ◽

Coefficient Of Determination ◽

Storm Event ◽

Storm Events ◽

Unit Hydrograph ◽

Runoff Simulation ◽

Flood Discharge ◽

Geospatial Modelling ◽

Peak Flood

Conservative peak flood discharge estimation methods such as the rational method do not take into account the soil infiltration of the precipitation, thus leading to inaccurate estimations of peak discharges during storm events. The accuracy of estimated peak flood discharge is crucial in designing a drainage system that has the capacity to channel runoffs during a storm event, especially cloudbursts and in the analysis of flood prevention and mitigation. The aim of this study was to model the peak flood discharges of each sub-watershed in Selangor using a geographic information system (GIS). The geospatial modelling integrated the watershed terrain model, the developed Soil Conservation Service Curve Cumber (SCS-CN) and precipitation to develop an equation for estimation of peak flood discharge. Hydrological Engineering Center-Hydrological Modeling System (HEC-HMS) was used again to simulate the rainfall-runoff based on the Clark-unit hydrograph to validate the modelled estimation of peak flood discharge. The estimated peak flood discharge showed a coefficient of determination, r2 of 0.9445, when compared with the runoff simulation of the Clark-unit hydrograph. Both the results of the geospatial modelling and the developed equation suggest that the peak flood discharge of a sub-watershed during a storm event has a positive relationship with the watershed area, precipitation and Curve Number (CN), which takes into account the soil bulk density and land-use of the studied area, Selangor in Malaysia. The findings of the study present a comparable and holistic approach to the estimation of peak flood discharge in a watershed which can be in the absence of a hydrodynamic simulation model.

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Water quality improvement in a small stormwater detention pond

Water Science & Technology ◽

10.2166/wst.1998.0389 ◽

1998 ◽

Vol 38 (10) ◽

pp. 115-122 ◽

Cited By ~ 17

Author(s):

Thomas J. R. Pettersson

Keyword(s):

Water Quality ◽

Quality Improvement ◽

Specific Surface ◽

Pollutant Removal ◽

Storm Event ◽

Storm Events ◽

Small Particles ◽

Water Quality Improvement ◽

Linear Profiles ◽

Detention Pond

The aim of this study was to investigate a small open detention pond predominantly receiving stormwater drainage from a highway. The results showed a difference in pollutant removal characteristics. Particle-associated pollutants were effectively removed during storm events as indicated by EMC (Event Mean Concentrations) while dissolved pollutants were not effectively removed. Outflow pollutant loads followed linear profiles when seven consecutive storm events were represented as cumulative graphs. PEMC's (Partial EMC's) during a storm event showed an association between the specific surface area of small particles and lead content. A detention pond should be designed according to capacity to detain the complete storm volume, thus avoiding short-circuiting of the pond by pollutants.

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Estimation of annual pollutant loadings in two small catchments and examination of their differences caused by regional properties

Water Science & Technology ◽

10.2166/wst.2006.036 ◽

2006 ◽

Vol 53 (2) ◽

pp. 33-44 ◽

Cited By ~ 2

Author(s):

S. Fujii ◽

M. Moriya ◽

P. Songprasert ◽

H. Ihara

Keyword(s):

River Basin ◽

High Frequency ◽

Storm Event ◽

Precipitation Pattern ◽

Storm Events ◽

Rainfall Events ◽

Survey Results ◽

One Year ◽

Small Catchments

A series of runoff surveys was conducted for more than one year in two small catchments of the Kamo River basin (75.4 km2) and the Takano River basin (66.8 km2) in Kyoto, Japan, which adjoin each other, and may have the same precipitation pattern. The investigation consisted of a high-frequency periodic survey, a long-term regular survey and a storm event survey. The survey results were compared with the regional properties of the basins, and the following results were obtained. (1) Pollutant loadings were successfully estimated as two portions of base discharge and storm events discharge from the survey results. (2) Estimated annual loading of the sites was 2.9–4.5, 1.3–1.8, 17–27, 1.3–2.2, 0.076–0.97 t/km2/y, respectively for CODMn, DOC, SS, TN and TP. (3) 52–53% of the whole flow, which was caused by rainfall events, conveyed 81–87, 68–73, 92–95, 64–67, 76–81% of the whole loading, respectively for CODMn, DOC, SS, TN and TP. (4) Differences of regional properties in two basins cause different runoff patterns, but the differences in runoff patterns also depend on the rainfall patterns. In general, a more urbanized basin receives early and strong influence of precipitation on the storm event runoff.

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Or constructions

Constructions and Frames ◽

10.1075/cf.00028.ari ◽

2019 ◽

Vol 11 (2) ◽

pp. 193-219 ◽

Cited By ~ 1

Author(s):

Mira Ariel

Keyword(s):

The Other ◽

Complex Relation ◽

Relative Contribution ◽

Other Hand ◽

Specific Interpretation ◽

New Codes ◽

The One ◽

Utterance Interpretation

Abstract Utterance interpretation involves semantically specified codes and context-based pragmatic inferences, which complement each other. The goal of this paper is to demonstrate the very complex relation between a subset of codes, Goldbergian constructions, specifically ones centering around ‘alternativity’, and pragmatic inferences. I analyze a variety of or constructions and sub-constructions, emphasizing not only the role of coded constructions on the one hand, and of inferences, on the other hand, but also of cues, namely, linguistic forms that bias towards a specific interpretation, although they do not encode that interpretation. The synchronic variability with respect to the relative contribution of code, inference and cue reflects a grammaticization cycle whereby codes (here constructions) are routinely enriched by inferences, often supported by cues, which in turn may evolve into new codes (here sub-constructions).

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