Periodic flooding has been widely believed to serve an important role in maintaining water levels and productivity of aquatic basins in floodplain landscapes. Here, I analyze four basins of contrasting flood frequencies (one through-flow, one pulse-flooded, two non-flooded) and two adjacent river sites in the PAD were sampled during the open-water season of 2007 and spring of 2008 to characterize linkages between hydrological processes (using O and H stable isotopes) and limnological conditions, and to assess how these linkages affect trophic interactions involving the aquatic flora and fauna (using C and N stable isotopes). The water balance and water chemistry of the through-flow basin was dominated at all times by the input of river water which reduced concentrations of nutrients and ions. In contrast, evaporation played an important role in the water balance and concentrated nutrients and ions in the non-flooded basins. Surprisingly, pulse-flood events had short-lived effects on the water balance and carbon stable isotopic signatures of biota. Hydrological and limnological conditions in the pulse-flooded basin were similar to those of the river water shortly after spring flooding. After flooding, evaporation caused rapid increase of δ18O of the water comparable to patterns observed in the non-flooded basins, but recovery of water chemistry variables was delayed. In the non-flooded and pulse-flooded basins, δ13CDIC declined due to atmospheric CO2 invasion under conditions of high primary productivity and pH that generated strong kinetic fractionation. This decline in δ13CDIC values produced the opposite effect compared to when photosynthesis occurs under non-limiting carbon conditions, as occurred in the through-flow basin. This feature provides important new knowledge to improve paleolimnological interpretation of δ13C values of organic matter in sediment cores to track past changes in flooding regimes. Importantly, this study shows that pulse floods exert short-lived transient (~1-2 months) effects of the water balance and carbon dynamics of aquatic food-webs and do not elevate aquatic production, but exert longer lasting (at least an entire open-water season) on water chemistry conditions. This contrasts with previous beliefs that the effects of pulse flooding are more profound and longer lasting.

No description available.

Little research has been conducted on the sensitivity of earlywood vessel in ring-porous tree species in response to flooding. The impact of flooding and climate on vessel characteristics in black ash (Fraxinus nigra Marsh.) was studied in the boreal region of Lake Duparquet, northwestern Quebec. In addition to standard tree-ring measurements, numbers and cross-sectional area of earlywood vessels were examined and measured using an image analyzing program. Interestingly, among all Spearman rank correlations between chronologies and hydrologic/climatic variables, the strongest associations were found between earlywood vessel chronologies from floodplain trees and spring river discharge data. High water discharge in the spring was negatively correlated to earlywood vessel area and inversely correlated to number of vessels. The mean earlywood vessel area chronology developed from floodplain trees was found to be the best proxy for high magnitude flood events and it has potential to be used for flood reconstructions.

Flood literature presents an inconsistent account of post-disaster distress; debating whether distress is pathological or normal and attempting to understand distress in terms of disaster variables. The literature therefore provides little guidance as to how to formulate difficulties in a clinically meaningful way reflective of individual’s experiences. The SPAARS model is presented as a model by which to reconcile these differences and quantitative support for its concepts were studied within two flooded samples. Participants who were flooded in Carlisle in 2005 (n=32) and participants flooded in Morpeth in 2008 (n=29) provided two samples at different stages in flood recovery and facilitated a quasi-longitudinal sample for comparison of flood-related distress over time. Participants were asked to complete a survey pertaining to: basic emotions experienced during the flood event, basic emotions experienced after the flood, Impact of Events Scale-Revised (IES-R), Regulation of Emotions Questionnaire (REQ) and the Trauma Symptom Inventory (TSI). Findings suggest that a third of participants who were flooded experienced clinically significant levels of distress, even after four years. Both samples showed higher levels of impact symptoms on the IES compared to symptoms on the TSI. Anxiety and anger were significant in reported flood experiences both during and after the flooding. Flood-related variables and previous experiences had no effect on increased distress but greater use of internal-dysfunctional emotion regulation strategies was related to increased impact and distress symptoms. Study findings and the SPAARS model are discussed in relation to previous flooding and PTSD literature, as well as clinical implications for the treatment of post-disaster distress and for the future management of flood-affected populations.

Wireless sensor networks (WSNs), being a relatively new technology, largely employ protocols designed for other ad hoc networks, especially mobile ad hoc networks (MANETs). However, on the basis of applications, there are many differences between WSNs and other types of ad hoc network and so WSNs would benefit from protocols which take into account their specific properties, especially in routing. Bhatti and Yue (2006) proposed an addressing scheme for multi-hop networks. It provides a systematic address structure for WSNs and allows network topology to avoid the fatal node failure problem which could occur with the ZigBee tree structure. In this work, a new routing strategy is developed based on Bhatti and Yue’s addressing scheme. The new approach is to implement a hybrid flooding scheme that combines flooding with shortest-path methods to yield a more practical routing protocol for static WSN applications. The primary idea is to set a flooding counter K as an overhead parameter of control messages which are used to discover routes between any arbitrary nodes. These route request messages are flooded for K hops and then oriented by shortest-path routing from multiple nodes in the edge of the flooding area to the destination. The simulation results show that this protocol under certain wireless circumstances is more energy conscious and produces less redundancy than reactive ZigBee routing protocol. Another advantage is that the routing protocol can adapt any dynamic environment in various WSN applications to achieve a satisfactory data delivery ratio in exchange for redundancy.

Bebyggda områden och byggnader har genom historien behövt anpassas för klimatet och vädret. Ibland är vädret mer extremt med stora mänder vatten eller vind. Med ett föränderligt klimat ändras förutsättningar för bebyggelse i städer som i Uppsala stad. Denna skrift behandlar dels kravbilden på kommuner avseende klimatförändringar och detaljplanering. Vidare studeras hur kommunen arbetar med frågan. Klimatförändringar kan gestaltas på flera sätt men denna studie studerar främst aspekter som berör översvämning. Det finns mycket kunskap och metoder att använda vid anpassning till ändrat väderklimat. Lagstiftning som berör detaljplanering och klimatförändring har analyserats. Vidare har intervjuer med tjänstemän verksamma inom Uppsala utförts för att får en bättre uppfattning om klimatanpassningsarbetet inom kommunen. Texten innehåller även en studie av valda detaljplaner, inom Uppsala kommun, som bedömts vara inom riskzon för översvmämning och erosion i urban miljö. Vid all urban planering är det en fråga om priotiteringar inom olika områden. Ibland uppnås synergieffekter, vilket framgår i några av valda detaljplaner. Men för att göra mer än vad lagstiftning kräver behöver fördelarna med klimatanpassning lyftas fram tydligare i organisationen och klimatanpassning måste oftare ses utifrån ett mer övergripande planeringsperspektiv än detaljplanenivå. / Climate change will affect local urban areas differently and society’s ability to handle changes depend in some part on what is considered in the planning process. This paper examines what the municipality is required to do regarding planning for and climate change. It then presents the results of a case study conducted in Uppsala municipality, which contains a study of approved planes in Uppsala town and interviews with employees at Uppsala municipality and region office. The results are that some aspects of climate change are more considered than other in this case study of urban planning. One can build houses in areas at risk but with the right precautions. There is potential to make society more adapted to climate change but it needs to be prioritized and located starting with planning for it.

Little research has been conducted on the sensitivity of earlywood vessel in ring-porous tree species in response to flooding. The impact of flooding and climate on vessel characteristics in black ash (Fraxinus nigra Marsh.) was studied in the boreal region of Lake Duparquet, northwestern Quebec. In addition to standard tree-ring measurements, numbers and cross-sectional area of earlywood vessels were examined and measured using an image analyzing program. Interestingly, among all Spearman rank correlations between chronologies and hydrologic/climatic variables, the strongest associations were found between earlywood vessel chronologies from floodplain trees and spring river discharge data. High water discharge in the spring was negatively correlated to earlywood vessel area and inversely correlated to number of vessels. The mean earlywood vessel area chronology developed from floodplain trees was found to be the best proxy for high magnitude flood events and it has potential to be used for flood reconstructions.

This study presents the dewatering assessment of a marl quarry with the future pit lake level predictions. The objectives of the study were / (1) to determine the dewatering requirements that would allow for the continuation of the quarrying operations in the deeper parts of the quarry, (2) to design an optimum dewatering system compatible with the site hydrogeological conditions and quarrying plans, (3) to assess the environmental impacts of dewatering on the local water (surface and ground water) resources and users, and (4) to predict the future pit lake level and flooding period for different meteorological conditions. To these ends, previous investigation reports and maps have been compiled and reviewed and field investigations have been conducted. During the field investigations pumping and observation wells were drilled and installed. After installation, in situ tests were conducted to determine aquifer parameters. It was found that properties of the material is conducive to the dewatering activities that will be necessary for the deepening of the open pit of the marl quarry. A groundwater model was developed based on the field data gathered. According to this model dewatering trenches will be needed to dewater the pit. The model predicted that operating these dewatering trenches would create an elongated cone of depression that will sufficiently lower the groundwater table so that quarrying operations can proceed. Lowering of the water table may produce a negative impact on groundwater resources within the aerial extent of the cone of depression. This potentially negative impact was investigated with model simulations and has been found that the impact to the resources would be negligible. Three scenarios were evaluated as possible dewatering discharge disposal solutions. The preferred scenario included the discharge of this water to the stream, which is flowing on the western side of the quarry. The pit will start to fill with water immediately after the dewatering operations stopped. In order to predict the pit lake flooding period and final lake elevation, pit lake hydrologic model was developed. The simulations predict that the final pit lake elevation would be at 991 m. The pit lake will rise to this level at approximately 72 years after closure.

In the history of a reservoir, after the period of primary production, about 30 to 40%, of the original oil in place may be produced using a secondary recovery mechanism. Polymer injection, which is classified as a tertiary method, can be applied to the remaining oil in place. In this thesis, oil/water relative permeabilities, effect of polymer injection on end point relative permeabilities and residual oil saturations in heterogeneous carbonate reservoirs were investigated. Numereous core flood experiments were conducted on different heteroegneous carbonate cores taken from Midyat Formation. Before starting the displacement experiments, porosity, permeability and capillary pressure experiments were performed. The heterogeneity of the cores are depicted from thin sections. Besides the main aim stated above, effect of flow rate and fracture presence on end point relative permeability and on residual oil saturation and were investigated. According to the results of the displacement tests, end point hexane relative permeability increased when polymer solution was used as the displacing phase.Besides, end point hexane relative permeability increased with polymer injection and fracture presence.

No description available.