The watershed approach, currently used to assess regional streams in the United States, emphasizes least-disturbed reference conditions. Consideration of extensive wadable drainage systems found in Arkansas and Mississippi deltas challenges concepts of disturbance within a landscape of historic agricultural land use. Seventeen wadable drainage ditch sites in Arkansas and Mississippi deltas were...

Social pressure on alluvial plains and deltas is large, both from an economic point of view and from a nature conservation point of view. Gradually, flood risks increase with economic development, because the expected damage increases, and with higher dikes, because the flooding depth increases. Global change, changing social desires, but also changing views, require a revision of flood-risk ma...

Existing bidirectional model transformation (BX) languages are mainly state-based: model alignment is hidden inside update propagating procedures, and model deltas are implicit. Weaving alignment with update propagation complicates the latter and makes it less predictable and less manageable. We propose to separate concerns and consider two distinct operations: delta discovery (alignment) and d...

This paper presents database programming language constructs that. can be used to realize a variety of different semantics for rule application in active database syst.ems. The primary novel feature introduced is the “delayed update”, or delta, which is a first-class value representing a set of proposed modifications to the underlying persistent store. Deltas can be created, inspected, and comb...

In many telecommunications information processing applications it is useful, and often necessary, to create and access multiple hypothetical states. These might correspond to future states re ecting pending updates, or hypothetical alternative states that arise in the exploration of possible solutions. This paper shows how the Heraclitus family of database programming languages can be applied t...

There are many applications which arise in telecommunications information processing in which it is useful, and often necessary, to create and access multiple hypothetical states. These might correspond to future states reeecting pending updates (such as customer service orders), or hypothetical alternative states that would arise in the exploration of diierent solutions to a given problem. In ...

We present a history of the application of the possible-world semantics of intensional logic to the development of versioned structures, ranging from simple software configuration to the networking of distributed context-aware applications permeated by multiple shared contexts. In this approach, all of the components of a system vary over a uniform multidimensional version, or context, space, a...

450 million people live on river deltas and thus land that is precariously low above the sea level sinking because of human activities natural processes. Although global debates around coastal risk typically focus rise, it lands rising seas together endanger lives livelihoods in deltas. However, ability to quantify address those risks an integrated manner remains limited. Herein, we identify fo...

Live programming is a style of development characterized by incremental change and immediate feedback. Instead of long edit-compile cycles, developers modify a running program by changing its source code, receiving immediate feedback as it instantly adapts in response. In this paper we propose an approach to bridge the gap between running programs and textual Domain-Specific Languages (DSLs). T...